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robfinch |
; ============================================================================
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robfinch |
; (C) 2012,2013 Robert Finch, Stratford
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robfinch |
; All Rights Reserved.
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; robfinch<remove>@opencores.org
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;
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; This source file is free software: you can redistribute it and/or modify
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; it under the terms of the GNU Lesser General Public License as published
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; by the Free Software Foundation, either version 3 of the License, or
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; (at your option) any later version.
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;
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; This source file is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;
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; ============================================================================
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;
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CR EQU 0x0D ;ASCII equates
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LF EQU 0x0A
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TAB EQU 0x09
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CTRLC EQU 0x03
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CTRLH EQU 0x08
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CTRLS EQU 0x13
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CTRLX EQU 0x18
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43 |
robfinch |
XON EQU 0x11
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XOFF EQU 0x13
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10 |
robfinch |
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43 |
robfinch |
DATA_PRESENT EQU 0x01 ; there is data preset at the serial port bc_uart3
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XMIT_NOT_FULL EQU 0x20
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BUFLEN EQU 80 ; length of keyboard input buffer
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; Initial stack tops for contexts
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; Each context gets 1k from the special 16k startup stack memory
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;
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STACKTOP0 EQU 0xFFFF_FFFF_FFFE_FFF8
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STACKTOP1 EQU 0xFFFF_FFFF_FFFE_FBF8
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STACKTOP2 EQU 0xFFFF_FFFF_FFFE_F7F8
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STACKTOP3 EQU 0xFFFF_FFFF_FFFE_F3F8
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STACKTOP4 EQU 0xFFFF_FFFF_FFFE_EFF8
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STACKTOP5 EQU 0xFFFF_FFFF_FFFE_EBF8
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STACKTOP6 EQU 0xFFFF_FFFF_FFFE_E7F8
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STACKTOP7 EQU 0xFFFF_FFFF_FFFE_E3F8
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STACKTOP8 EQU 0xFFFF_FFFF_FFFE_DFF8
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STACKTOP9 EQU 0xFFFF_FFFF_FFFE_DBF8
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STACKTOP10 EQU 0xFFFF_FFFF_FFFE_D7F8
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STACKTOP11 EQU 0xFFFF_FFFF_FFFE_D3F8
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STACKTOP12 EQU 0xFFFF_FFFF_FFFE_CFF8
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STACKTOP13 EQU 0xFFFF_FFFF_FFFE_CBF8
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STACKTOP14 EQU 0xFFFF_FFFF_FFFE_C7F8
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STACKTOP15 EQU 0xFFFF_FFFF_FFFE_C3F8
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; BOOT ROM routines
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TCBSize EQU 0x200 ; 512 bytes per TCB
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TCBBase EQU 0x00000001_00000000 ; TCB pages
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TCBr1 EQU 0x00
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TCBr2 EQU 0x08
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TCBr3 EQU 0x10
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TCBr4 EQU 0x18
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TCBr5 EQU 0x20
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TCBr6 EQU 0x28
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TCBr7 EQU 0x30
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TCBr8 EQU 0x38
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TCBr9 EQU 0x40
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TCBr10 EQU 0x48
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TCBr11 EQU 0x50
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TCBr12 EQU 0x58
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TCBr13 EQU 0x60
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TCBr14 EQU 0x68
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TCBr15 EQU 0x70
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TCBr16 EQU 0x78
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TCBr17 EQU 0x80
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TCBr18 EQU 0x88
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TCBr19 EQU 0x90
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TCBr20 EQU 0x98
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TCBr21 EQU 0xA0
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TCBr22 EQU 0xA8
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TCBr23 EQU 0xB0
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TCBr24 EQU 0xB8
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TCBr25 EQU 0xC0
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TCBr26 EQU 0xC8
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TCBr27 EQU 0xD0
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TCBr28 EQU 0xD8
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TCBr29 EQU 0xE0
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TCBr30 EQU 0xE8
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TCBr31 EQU 0xF0
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warmStart EQU 0x1020
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usrJmp EQU 0x1028
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TickIRQAddr EQU 0x1030
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TaskBlock EQU 0x1038
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tencount EQU 0x13F8
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Milliseconds EQU 0x1400
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Lastloc EQU 0x1408
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ScreenColor EQU 0x1414
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CursorRow EQU 0x1416
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CursorCol EQU 0x1418
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CursorFlash EQU 0x141A
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KeybdEcho EQU 0x141C
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KeybdBuffer EQU 0x1440
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KeybdHead EQU 0x1450
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KeybdTail EQU 0x1451
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Score EQU 0x1500
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Manpos EQU 0x1508
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MissileActive EQU 0x1510
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MissileX EQU 0x1512
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MissileY EQU 0x1514
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InvadersRow1 EQU 0x1520
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InvadersRow2 EQU 0x1530
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InvadersRow3 EQU 0x1540
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InvadersRow4 EQU 0x1550
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InvadersRow5 EQU 0x1560
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InvadersColpos EQU 0x1570
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InvadersRowpos EQU 0x1571
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Uart_rxfifo EQU 0x1600
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Uart_rxhead EQU 0x1800
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Uart_rxtail EQU 0x1802
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Uart_ms EQU 0x1808
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Uart_rxrts EQU 0x1809
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Uart_rxdtr EQU 0x180A
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Uart_rxxon EQU 0x180B
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Uart_rxflow EQU 0x180C
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Uart_fon EQU 0x180E
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Uart_foff EQU 0x1810
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Uart_txrts EQU 0x1812
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Uart_txdtr EQU 0x1813
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Uart_txxon EQU 0x1814
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Uart_txxonoff EQU 0x1815
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TaskList EQU 0x2000
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ReadyList1 EQU 0x2000
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ReadyList2 EQU 0x2020
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ReadyList3 EQU 0x2040
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ReadyList4 EQU 0x2060
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ReadyList5 EQU 0x2080
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ReadyNdx1 EQU 0x20A0
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ReadyNdx2 EQU 0x20A1
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ReadyNdx3 EQU 0x20A2
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ReadyNdx4 EQU 0x20A3
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ReadyNdx5 EQU 0x20A4
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RunningTCB EQU 0x20A6
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NextToRunTCB EQU 0x20A8
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r1save EQU 0x20B0
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r2save EQU 0x20B8
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AXCstart EQU 0x20C0
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p100IRQvec EQU 0x3000
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keybdIRQvec EQU 0x3008
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serialIRQvec EQU 0x3010
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rasterIRQvec EQU 0x3018
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TEXTSCR EQU 0xD0_0000
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COLORSCR EQU 0xD1_0000
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TEXTREG EQU 0xDA_0000
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27 |
robfinch |
TEXT_COLS EQU 0x0
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TEXT_ROWS EQU 0x2
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TEXT_CURPOS EQU 0x16
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43 |
robfinch |
KEYBD EQU 0xDC_0000
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KEYBDCLR EQU 0xDC_0002
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UART EQU 0xDC_0A00
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UART_LS EQU 0xDC_0A01
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UART_MS EQU 0xDC_0A02
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UART_IS EQU 0xDC_0A03
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UART_IE EQU 0xDC_0A04
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UART_MC EQU 0xDC_0A06
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DATETIME EQU 0xDC_0400
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PIC EQU 0xDC_0FF0
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PIC_IE EQU 0xDC_0FF2
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PSG EQU 0xD5_0000
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PSGFREQ0 EQU 0xD5_0000
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PSGPW0 EQU 0xD5_0002
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PSGCTRL0 EQU 0xD5_0004
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PSGADSR0 EQU 0xD5_0006
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SPRRAM EQU 0xD8_0000
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AC97 EQU 0xDC_1000
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LED EQU 0xDC_0600
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GACCEL EQU 0xDA_E000
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RASTERIRQ EQU 0xDA_0100
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27 |
robfinch |
BOOT_STACK EQU 0xFFFF_FFFF_FFFE_FFF8
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43 |
robfinch |
SPRITEREGS EQU 0xDA_D000
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27 |
robfinch |
BITMAPSCR EQU 0x00000001_00200000
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txempty EQU 0x40
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rxfull EQU 0x01
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43 |
robfinch |
;
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; Internal variables follow:
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;
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bss
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org 0x1038
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txtWidth db 0 ; BIOS var =56
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txtHeight db 0 ; BIOS var =31
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cursx db 0 ; cursor x position
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| 201 |
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cursy db 0 ; cursor y position
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pos dh 0 ; text screen position
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org 0x1040
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charToPrint dc 0
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fgColor db 0
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bkColor db 0
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cursFlash db 0 ; flash the cursor ?
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lineLinkTbl fill.b 25,0 ; screen line link table
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align 8
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org 0x1080
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typef db 0 ; variable / expression type
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align 8
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OSSP dw 1 ; OS value of sp
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CURRNT dw 1 ; Current line pointer
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STKGOS dw 1 ; Saves stack pointer in 'GOSUB'
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STKINP dw 1 ; Saves stack pointer during 'INPUT'
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LOPVAR dw 1 ; 'FOR' loop save area
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LOPINC dw 1 ; increment
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LOPLMT dw 1 ; limit
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LOPLN dw 1 ; line number
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LOPPT dw 1 ; text pointer
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TXTUNF dw 1 ; points to unfilled text area
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VARBGN dw 1 ; points to variable area
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IVARBGN dw 1 ; points to integer variable area
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| 227 |
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SVARBGN dw 1 ; points to string variable area
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| 228 |
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FVARBGN dw 1 ; points to float variable area
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STKBOT dw 1 ; holds lower limit for stack growth
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NUMWKA fill.b 24,0 ; numeric work area
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BUFFER fill.b BUFLEN,0x00 ; Keyboard input buffer
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| 233 |
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bss
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org 0x1_00600000
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TXT equ 0x1_00600000 ; Beginning of program area
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| 237 |
27 |
robfinch |
; org 0x070
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; iret
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; nop
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; nop
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| 241 |
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; nop
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| 242 |
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; nop
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| 243 |
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; nop
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| 244 |
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; nop
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| 245 |
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; nop
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| 246 |
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;
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| 247 |
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code
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| 248 |
43 |
robfinch |
org 0xFFFF_FFFF_FFFF_B000
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| 249 |
27 |
robfinch |
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| 250 |
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; jump table
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| 251 |
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;
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| 252 |
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jmp SerialGetChar
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| 253 |
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jmp SerialPutChar
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| 254 |
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jmp SetKeyboardEcho
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| 255 |
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jmp KeybdCheckForKey
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| 256 |
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jmp KeybdGetChar
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| 257 |
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jmp DisplayChar
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| 258 |
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jmp DisplayString
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| 259 |
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| 260 |
10 |
robfinch |
start:
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| 261 |
27 |
robfinch |
; lea MSGRAM,a1
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| 262 |
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; jsr DisplayString
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| 263 |
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| 264 |
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ColdStart:
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| 265 |
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icache_on ; turn on the ICache
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| 266 |
43 |
robfinch |
dcache_off ; turn on the DCache
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| 267 |
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| 268 |
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; Initialize the context schedule with all contexts treated equally
|
| 269 |
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; There are only 16 contexts, but 256 schedule slots. Each context is
|
| 270 |
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; given 16 slots distributed evenly throughout the execution pattern
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| 271 |
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; table.
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| 272 |
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;
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| 273 |
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xor r1,r1,r1 ; r1 = 0
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| 274 |
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ict1:
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| 275 |
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mtep r1,r1 ; only the low order four bits of r1 will move to the pattern table
|
| 276 |
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addui r1,r1,#1
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| 277 |
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cmpi r2,r1,#255
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| 278 |
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bne r2,r0,ict1
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| 279 |
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| 280 |
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; Point the interrupt return address register of the context to the
|
| 281 |
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; context startup code. The context will start up when an interrupt return
|
| 282 |
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; occurs.
|
| 283 |
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;
|
| 284 |
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; We cannot use a loop for this. Fortunately there's only 16 contexts.
|
| 285 |
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;
|
| 286 |
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lea r25,ctxstart
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| 287 |
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lea r30,STACKTOP0
|
| 288 |
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iepp
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| 289 |
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nop
|
| 290 |
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nop
|
| 291 |
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lea r25,ctxstart
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| 292 |
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lea r30,STACKTOP1
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| 293 |
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iepp
|
| 294 |
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nop
|
| 295 |
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nop
|
| 296 |
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lea r25,ctxstart
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| 297 |
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lea r30,STACKTOP2
|
| 298 |
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iepp
|
| 299 |
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nop
|
| 300 |
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nop
|
| 301 |
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lea r25,ctxstart
|
| 302 |
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lea r30,STACKTOP3
|
| 303 |
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iepp
|
| 304 |
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nop
|
| 305 |
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nop
|
| 306 |
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| 307 |
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lea r25,ctxstart
|
| 308 |
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lea r30,STACKTOP4
|
| 309 |
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iepp
|
| 310 |
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nop
|
| 311 |
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nop
|
| 312 |
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lea r25,ctxstart
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| 313 |
|
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lea r30,STACKTOP5
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| 314 |
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iepp
|
| 315 |
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nop
|
| 316 |
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nop
|
| 317 |
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lea r25,ctxstart
|
| 318 |
|
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lea r30,STACKTOP6
|
| 319 |
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iepp
|
| 320 |
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nop
|
| 321 |
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nop
|
| 322 |
|
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lea r25,ctxstart
|
| 323 |
|
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lea r30,STACKTOP7
|
| 324 |
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iepp
|
| 325 |
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nop
|
| 326 |
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nop
|
| 327 |
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|
| 328 |
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lea r25,ctxstart
|
| 329 |
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lea r30,STACKTOP8
|
| 330 |
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iepp
|
| 331 |
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nop
|
| 332 |
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nop
|
| 333 |
|
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lea r25,ctxstart
|
| 334 |
|
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lea r30,STACKTOP9
|
| 335 |
|
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iepp
|
| 336 |
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nop
|
| 337 |
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nop
|
| 338 |
|
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lea r25,ctxstart
|
| 339 |
|
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lea r30,STACKTOP10
|
| 340 |
|
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iepp
|
| 341 |
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nop
|
| 342 |
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nop
|
| 343 |
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lea r25,ctxstart
|
| 344 |
|
|
lea r30,STACKTOP11
|
| 345 |
|
|
iepp
|
| 346 |
|
|
nop
|
| 347 |
|
|
nop
|
| 348 |
|
|
|
| 349 |
|
|
lea r25,ctxstart
|
| 350 |
|
|
lea r30,STACKTOP12
|
| 351 |
|
|
iepp
|
| 352 |
|
|
nop
|
| 353 |
|
|
nop
|
| 354 |
|
|
lea r25,ctxstart
|
| 355 |
|
|
lea r30,STACKTOP13
|
| 356 |
|
|
iepp
|
| 357 |
|
|
nop
|
| 358 |
|
|
nop
|
| 359 |
|
|
lea r25,ctxstart
|
| 360 |
|
|
lea r30,STACKTOP14
|
| 361 |
|
|
iepp
|
| 362 |
|
|
nop
|
| 363 |
|
|
nop
|
| 364 |
|
|
lea r25,ctxstart
|
| 365 |
|
|
lea r30,STACKTOP15
|
| 366 |
|
|
iepp
|
| 367 |
|
|
nop
|
| 368 |
|
|
nop
|
| 369 |
|
|
|
| 370 |
|
|
; Ensure that context zero is the active context
|
| 371 |
|
|
;
|
| 372 |
|
|
ctxstart3:
|
| 373 |
|
|
mfspr r1,AXC
|
| 374 |
|
|
beq r1,r0,ctxstart2
|
| 375 |
|
|
iepp
|
| 376 |
|
|
nop
|
| 377 |
|
|
nop
|
| 378 |
|
|
bra ctxstart3
|
| 379 |
|
|
ctxstart2:
|
| 380 |
|
|
sb r1,AXCstart ; save off the startup context which should be context zero
|
| 381 |
|
|
|
| 382 |
|
|
; Entry point for context startup
|
| 383 |
|
|
;
|
| 384 |
|
|
; Avoid repeating all the system initialization when a context starts up by testing whether
|
| 385 |
|
|
; or not the context is the starting context.
|
| 386 |
|
|
;
|
| 387 |
|
|
ctxstart:
|
| 388 |
|
|
mfspr r1,AXC
|
| 389 |
|
|
lbu r2,AXCstart
|
| 390 |
|
|
bne r1,r2,ctxstart1
|
| 391 |
|
|
|
| 392 |
|
|
;
|
| 393 |
|
|
; set system vectors
|
| 394 |
|
|
; TBA defaults to zero on reset
|
| 395 |
|
|
;
|
| 396 |
|
|
setlo r3,#0
|
| 397 |
|
|
setlo r2,#511
|
| 398 |
|
|
lea r1,nmirout
|
| 399 |
|
|
csj5:
|
| 400 |
|
|
sw r1,[r3]
|
| 401 |
|
|
addui r3,r3,#8
|
| 402 |
|
|
loop r2,csj5
|
| 403 |
|
|
lea r1,KeybdSC ; keyboard BIOS vector
|
| 404 |
|
|
sw r1,0xD08
|
| 405 |
|
|
lea r1,irqrout
|
| 406 |
|
|
sw r1,0xE08 ; set IRQ vector
|
| 407 |
|
|
lea r1,dberr_rout
|
| 408 |
|
|
sw r1,0xFE0 ; set Bus error vector
|
| 409 |
|
|
lea r1,iberr_rout
|
| 410 |
|
|
sw r1,0xFE8 ; set Bus error vector
|
| 411 |
|
|
lea r1,nmirout
|
| 412 |
|
|
sw r1,0xFF0 ; set NMI vector
|
| 413 |
|
|
|
| 414 |
|
|
lea r1,KeybdIRQ
|
| 415 |
|
|
sw r1,keybdIRQvec
|
| 416 |
|
|
lea r1,Pulse100
|
| 417 |
|
|
sw r1,p100IRQvec
|
| 418 |
|
|
lea r1,SerialIRQ
|
| 419 |
|
|
sw r1,serialIRQvec
|
| 420 |
|
|
lea r1,RasterIRQfn
|
| 421 |
|
|
sw r1,rasterIRQvec
|
| 422 |
|
|
|
| 423 |
|
|
;-------------------------------
|
| 424 |
|
|
; Initialize I/O devices
|
| 425 |
|
|
;-------------------------------
|
| 426 |
|
|
call SerialInit
|
| 427 |
27 |
robfinch |
call KeybdInit
|
| 428 |
|
|
call PICInit
|
| 429 |
43 |
robfinch |
call SetupRasterIRQ
|
| 430 |
27 |
robfinch |
cli ; enable interrupts
|
| 431 |
43 |
robfinch |
; call HelloWorld
|
| 432 |
27 |
robfinch |
setlo r3,#0xCE ; blue on blue
|
| 433 |
|
|
sc r3,ScreenColor
|
| 434 |
43 |
robfinch |
lc r3,0x1414
|
| 435 |
27 |
robfinch |
setlo r3,#32
|
| 436 |
43 |
robfinch |
sc r3,0x1416 ; we do a store, then a load through the dcache
|
| 437 |
|
|
lc r2,0x1416 ;
|
| 438 |
27 |
robfinch |
beq r2,r3,dcokay
|
| 439 |
|
|
dcache_off ; data cache failed
|
| 440 |
|
|
dcokay:
|
| 441 |
43 |
robfinch |
sc r0,NextToRunTCB
|
| 442 |
|
|
sc r0,RunningTCB
|
| 443 |
27 |
robfinch |
call ClearScreen
|
| 444 |
|
|
call ClearBmpScreen
|
| 445 |
43 |
robfinch |
call RandomizeSprram
|
| 446 |
27 |
robfinch |
sc r0,CursorRow
|
| 447 |
|
|
sc r0,CursorCol
|
| 448 |
43 |
robfinch |
setlo r1,#1
|
| 449 |
|
|
sb r1,CursorFlash
|
| 450 |
|
|
lea r1,MSGSTART
|
| 451 |
|
|
call DisplayStringCRLF
|
| 452 |
|
|
jmp Monitor
|
| 453 |
|
|
call SetupAC97 ; and Beep
|
| 454 |
|
|
setlo r3,#4
|
| 455 |
|
|
outb r3,LED
|
| 456 |
|
|
call Beep
|
| 457 |
27 |
robfinch |
|
| 458 |
|
|
j4:
|
| 459 |
|
|
jmp Monitor
|
| 460 |
|
|
bra j4
|
| 461 |
|
|
|
| 462 |
43 |
robfinch |
; for now hang the contexts
|
| 463 |
|
|
;
|
| 464 |
|
|
ctxstart1:
|
| 465 |
|
|
bra ctxstart1
|
| 466 |
|
|
|
| 467 |
27 |
robfinch |
; call ramtest
|
| 468 |
|
|
|
| 469 |
|
|
;-----------------------------------------
|
| 470 |
|
|
; Hello World!
|
| 471 |
|
|
;-----------------------------------------
|
| 472 |
|
|
HelloWorld:
|
| 473 |
|
|
subui r30,r30,#24
|
| 474 |
43 |
robfinch |
sw r1,[sp]
|
| 475 |
|
|
sw r2,8[sp]
|
| 476 |
|
|
sw lr,16[sp]
|
| 477 |
|
|
lea r2,MSG
|
| 478 |
27 |
robfinch |
j3:
|
| 479 |
|
|
lb r1,[r2]
|
| 480 |
|
|
beq r1,r0,j2
|
| 481 |
|
|
call SerialPutChar
|
| 482 |
|
|
addui r2,r2,#1
|
| 483 |
|
|
bra j3
|
| 484 |
|
|
j2:
|
| 485 |
43 |
robfinch |
sw lr,16[sp]
|
| 486 |
|
|
sw r2,8[sp]
|
| 487 |
|
|
sw r1,[sp]
|
| 488 |
27 |
robfinch |
ret #24
|
| 489 |
|
|
|
| 490 |
|
|
|
| 491 |
|
|
align 16
|
| 492 |
|
|
MSG:
|
| 493 |
43 |
robfinch |
db "Hello World!",0
|
| 494 |
27 |
robfinch |
MSGSTART:
|
| 495 |
43 |
robfinch |
db "Raptor64 system starting....",0
|
| 496 |
27 |
robfinch |
|
| 497 |
|
|
align 16
|
| 498 |
|
|
|
| 499 |
|
|
;----------------------------------------------------------
|
| 500 |
|
|
; Initialize programmable interrupt controller (PIC)
|
| 501 |
|
|
; 0 = nmi
|
| 502 |
|
|
; 1 = keyboard reset
|
| 503 |
43 |
robfinch |
; 2 = 1000Hz pulse (context switcher)
|
| 504 |
|
|
; 3 = 100Hz pulse (cursor flash)
|
| 505 |
|
|
; 8 = uart
|
| 506 |
|
|
; 13 = raster interrupt
|
| 507 |
27 |
robfinch |
; 15 = keyboard char
|
| 508 |
|
|
;----------------------------------------------------------
|
| 509 |
|
|
PICInit:
|
| 510 |
43 |
robfinch |
lea r1,PICret
|
| 511 |
|
|
sw r1,TickIRQAddr
|
| 512 |
|
|
; enable: raster irq,
|
| 513 |
|
|
setlo r1,#0xA00F ; enable nmi,kbd_rst,and kbd_irq
|
| 514 |
|
|
; A10F enable serial IRQ
|
| 515 |
|
|
outc r1,PIC_IE
|
| 516 |
|
|
PICret:
|
| 517 |
27 |
robfinch |
ret
|
| 518 |
|
|
|
| 519 |
43 |
robfinch |
;==============================================================================
|
| 520 |
|
|
; Serial port
|
| 521 |
|
|
;==============================================================================
|
| 522 |
27 |
robfinch |
;-----------------------------------------
|
| 523 |
43 |
robfinch |
; Initialize the serial port
|
| 524 |
27 |
robfinch |
;-----------------------------------------
|
| 525 |
43 |
robfinch |
;
|
| 526 |
|
|
SerialInit:
|
| 527 |
|
|
sc r0,Uart_rxhead ; reset buffer indexes
|
| 528 |
|
|
sc r0,Uart_rxtail
|
| 529 |
|
|
setlo r1,#0x1f0
|
| 530 |
|
|
sc r1,Uart_foff ; set threshold for XOFF
|
| 531 |
|
|
setlo r1,#0x010
|
| 532 |
|
|
sc r1,Uart_fon ; set threshold for XON
|
| 533 |
|
|
setlo r1,#1
|
| 534 |
|
|
outb r1,UART_IE ; enable receive interrupt only
|
| 535 |
|
|
sb r0,Uart_rxrts ; no RTS/CTS signals available
|
| 536 |
|
|
sb r0,Uart_txrts ; no RTS/CTS signals available
|
| 537 |
|
|
sb r0,Uart_txdtr ; no DTR signals available
|
| 538 |
|
|
sb r0,Uart_rxdtr ; no DTR signals available
|
| 539 |
|
|
setlo r1,#1
|
| 540 |
|
|
sb r1,Uart_txxon ; for now
|
| 541 |
|
|
ret
|
| 542 |
|
|
|
| 543 |
|
|
;---------------------------------------------------------------------------------
|
| 544 |
|
|
; Get character directly from serial port. Blocks until a character is available.
|
| 545 |
|
|
;---------------------------------------------------------------------------------
|
| 546 |
|
|
;
|
| 547 |
|
|
SerialGetCharDirect:
|
| 548 |
27 |
robfinch |
sgc1:
|
| 549 |
43 |
robfinch |
inb r1,UART_LS ; uart status
|
| 550 |
|
|
andi r1,r1,#rxfull ; is there a char available ?
|
| 551 |
|
|
beq r1,r0,sgc1
|
| 552 |
|
|
inb r1,UART
|
| 553 |
|
|
ret
|
| 554 |
27 |
robfinch |
|
| 555 |
43 |
robfinch |
;------------------------------------------------
|
| 556 |
|
|
; Check for a character at the serial port
|
| 557 |
|
|
; returns r1 = 1 if char available, 0 otherwise
|
| 558 |
|
|
;------------------------------------------------
|
| 559 |
|
|
;
|
| 560 |
|
|
SerialCheckForCharDirect:
|
| 561 |
|
|
inb r1,UART_LS ; uart status
|
| 562 |
|
|
andi r1,r1,#rxfull ; is there a char available ?
|
| 563 |
|
|
sne r1,r1,r0
|
| 564 |
|
|
ret
|
| 565 |
|
|
|
| 566 |
27 |
robfinch |
;-----------------------------------------
|
| 567 |
|
|
; Put character to serial port
|
| 568 |
43 |
robfinch |
; r1 = char to put
|
| 569 |
27 |
robfinch |
;-----------------------------------------
|
| 570 |
43 |
robfinch |
;
|
| 571 |
27 |
robfinch |
SerialPutChar:
|
| 572 |
43 |
robfinch |
subui sp,sp,#32
|
| 573 |
|
|
sw r2,[sp]
|
| 574 |
|
|
sw r3,8[sp]
|
| 575 |
|
|
sw r4,16[sp]
|
| 576 |
|
|
sw r5,24[sp]
|
| 577 |
|
|
inb r2,UART_MC
|
| 578 |
|
|
ori r2,r2,#3 ; assert DTR / RTS
|
| 579 |
|
|
outb r2,UART_MC
|
| 580 |
|
|
lb r2,Uart_txrts
|
| 581 |
|
|
beq r2,r0,spcb1
|
| 582 |
|
|
lw r4,Milliseconds
|
| 583 |
|
|
setlo r3,#100 ; delay count (1 s)
|
| 584 |
|
|
spcb3:
|
| 585 |
|
|
inb r2,UART_MS
|
| 586 |
|
|
andi r2,r2,#10 ; is CTS asserted ?
|
| 587 |
|
|
bne r2,r0,spcb1
|
| 588 |
|
|
lw r5,Milliseconds
|
| 589 |
|
|
beq r4,r5,spcb3
|
| 590 |
|
|
mov r4,r5
|
| 591 |
|
|
loop r3,spcb3
|
| 592 |
|
|
bra spcabort
|
| 593 |
|
|
spcb1:
|
| 594 |
|
|
lb r2,Uart_txdtr
|
| 595 |
|
|
beq r2,r0,spcb2
|
| 596 |
|
|
lw r4,Milliseconds
|
| 597 |
|
|
setlo r3,#100 ; delay count
|
| 598 |
|
|
spcb4:
|
| 599 |
|
|
inb r2,UART_MS
|
| 600 |
|
|
andi r2,r2,#20 ; is DSR asserted ?
|
| 601 |
|
|
bne r2,r0,spcb2
|
| 602 |
|
|
lw r5,Milliseconds
|
| 603 |
|
|
beq r4,r5,spcb4
|
| 604 |
|
|
mov r4,r5
|
| 605 |
|
|
loop r3,spcb4
|
| 606 |
|
|
bra spcabort
|
| 607 |
|
|
spcb2:
|
| 608 |
|
|
lb r2,Uart_txxon
|
| 609 |
|
|
beq r2,r0,spcb5
|
| 610 |
|
|
spcb6:
|
| 611 |
|
|
lb r2,Uart_txxonoff
|
| 612 |
|
|
beq r2,r0,spcb5
|
| 613 |
|
|
inb r4,UART_MS
|
| 614 |
|
|
andi r4,r4,#0x80 ; DCD ?
|
| 615 |
|
|
bne r4,r0,spcb6
|
| 616 |
|
|
spcb5:
|
| 617 |
|
|
lw r4,Milliseconds
|
| 618 |
|
|
setlo r3,#100 ; wait up to 1s
|
| 619 |
|
|
spcb8:
|
| 620 |
|
|
inb r2,UART_LS
|
| 621 |
|
|
andi r2,r2,#0x20 ; tx not full ?
|
| 622 |
|
|
bne r2,r0,spcb7
|
| 623 |
|
|
lw r5,Milliseconds
|
| 624 |
|
|
beq r4,r5,spcb8
|
| 625 |
|
|
mov r4,r5
|
| 626 |
|
|
loop r3,spcb8
|
| 627 |
|
|
bra spcabort
|
| 628 |
|
|
spcb7:
|
| 629 |
|
|
outb r1,UART
|
| 630 |
|
|
spcabort:
|
| 631 |
|
|
lw r2,[sp]
|
| 632 |
|
|
lw r3,8[sp]
|
| 633 |
|
|
lw r4,16[sp]
|
| 634 |
|
|
lw r5,24[sp]
|
| 635 |
|
|
ret #32
|
| 636 |
27 |
robfinch |
|
| 637 |
43 |
robfinch |
;-------------------------------------------------
|
| 638 |
|
|
; Compute number of characters in recieve buffer.
|
| 639 |
|
|
; r4 = number of chars
|
| 640 |
|
|
;-------------------------------------------------
|
| 641 |
|
|
CharsInRxBuf:
|
| 642 |
|
|
lc r4,Uart_rxhead
|
| 643 |
|
|
lc r2,Uart_rxtail
|
| 644 |
|
|
subu r4,r4,r2
|
| 645 |
|
|
bgt r4,r0,cirxb1
|
| 646 |
|
|
setlo r4,#0x200
|
| 647 |
|
|
addu r4,r4,r2
|
| 648 |
|
|
lc r2,Uart_rxhead
|
| 649 |
|
|
subu r4,r4,r2
|
| 650 |
|
|
cirxb1:
|
| 651 |
|
|
ret
|
| 652 |
|
|
|
| 653 |
|
|
;----------------------------------------------
|
| 654 |
|
|
; Get character from rx fifo
|
| 655 |
|
|
; If the fifo is empty enough then send an XON
|
| 656 |
|
|
;----------------------------------------------
|
| 657 |
|
|
;
|
| 658 |
|
|
SerialGetChar:
|
| 659 |
|
|
subui sp,sp,#32
|
| 660 |
|
|
sw r2,[sp]
|
| 661 |
|
|
sw r3,8[sp]
|
| 662 |
|
|
sw r4,16[sp]
|
| 663 |
|
|
sw lr,24[sp]
|
| 664 |
|
|
lc r3,Uart_rxhead
|
| 665 |
|
|
lc r2,Uart_rxtail
|
| 666 |
|
|
beq r2,r3,sgcfifo1 ; is there a char available ?
|
| 667 |
|
|
lea r3,Uart_rxfifo
|
| 668 |
|
|
lb r1,[r2+r3] ; get the char from the fifo into r1
|
| 669 |
|
|
addui r2,r2,#1 ; increment the fifo pointer
|
| 670 |
|
|
andi r2,r2,#0x1ff
|
| 671 |
|
|
sc r2,Uart_rxtail
|
| 672 |
|
|
lb r2,Uart_rxflow ; using flow control ?
|
| 673 |
|
|
beq r2,r0,sgcfifo2
|
| 674 |
|
|
lc r3,Uart_fon ; enough space in Rx buffer ?
|
| 675 |
|
|
call CharsInRxBuf
|
| 676 |
|
|
bgt r4,r3,sgcfifo2
|
| 677 |
|
|
sb r0,Uart_rxflow ; flow off
|
| 678 |
|
|
lb r4,Uart_rxrts
|
| 679 |
|
|
beq r4,r0,sgcfifo3
|
| 680 |
|
|
inb r4,UART_MC ; set rts bit in MC
|
| 681 |
|
|
ori r4,r4,#2
|
| 682 |
|
|
outb r4,UART_MC
|
| 683 |
|
|
sgcfifo3:
|
| 684 |
|
|
lb r4,Uart_rxdtr
|
| 685 |
|
|
beq r4,r0,sgcfifo4
|
| 686 |
|
|
inb r4,UART_MC ; set DTR
|
| 687 |
|
|
ori r4,r4,#1
|
| 688 |
|
|
outb r4,UART_MC
|
| 689 |
|
|
sgcfifo4:
|
| 690 |
|
|
lb r4,Uart_rxxon
|
| 691 |
|
|
beq r4,r0,sgcfifo5
|
| 692 |
|
|
setlo r4,#XON
|
| 693 |
|
|
outb r4,UART
|
| 694 |
|
|
sgcfifo5:
|
| 695 |
|
|
sgcfifo2: ; return with char in r1
|
| 696 |
|
|
lw r2,[sp]
|
| 697 |
|
|
lw r3,8[sp]
|
| 698 |
|
|
lw r4,16[sp]
|
| 699 |
|
|
lw lr,24[sp]
|
| 700 |
|
|
ret #32
|
| 701 |
|
|
sgcfifo1:
|
| 702 |
|
|
setlo r1,#-1 ; no char available
|
| 703 |
|
|
lw r2,[sp]
|
| 704 |
|
|
lw r3,8[sp]
|
| 705 |
|
|
lw r4,16[sp]
|
| 706 |
|
|
lw lr,24[sp]
|
| 707 |
|
|
ret #32
|
| 708 |
|
|
|
| 709 |
|
|
;-----------------------------------------
|
| 710 |
|
|
; Serial port IRQ
|
| 711 |
|
|
;-----------------------------------------
|
| 712 |
|
|
;
|
| 713 |
|
|
SerialIRQ:
|
| 714 |
|
|
subui sp,sp,#40
|
| 715 |
|
|
sw r1,[sp]
|
| 716 |
|
|
sw r2,8[sp]
|
| 717 |
|
|
sw r3,16[sp]
|
| 718 |
|
|
sw r4,24[sp]
|
| 719 |
|
|
sw lr,32[sp]
|
| 720 |
|
|
inb r1,UART_IS ; get interrupt status
|
| 721 |
|
|
bge r1,r0,sirq1
|
| 722 |
|
|
andi r1,r1,#0x7f ; switch on interrupt type
|
| 723 |
|
|
beqi r1,#4,srxirq
|
| 724 |
|
|
beqi r1,#0xC,stxirq
|
| 725 |
|
|
beqi r1,#0x10,smsirq
|
| 726 |
|
|
sirq1:
|
| 727 |
|
|
lw r1,[sp]
|
| 728 |
|
|
lw r2,8[sp]
|
| 729 |
|
|
lw r3,16[sp]
|
| 730 |
|
|
lw r4,24[sp]
|
| 731 |
|
|
lw lr,32[sp]
|
| 732 |
|
|
ret #40
|
| 733 |
|
|
|
| 734 |
|
|
; Get the modem status and record it
|
| 735 |
|
|
smsirq:
|
| 736 |
|
|
inb r1,UART_MS
|
| 737 |
|
|
sb r1,Uart_ms
|
| 738 |
|
|
bra sirq1
|
| 739 |
|
|
|
| 740 |
|
|
stxirq:
|
| 741 |
|
|
bra sirq1
|
| 742 |
|
|
|
| 743 |
|
|
; Get a character from the uart and store it in the rx fifo
|
| 744 |
|
|
srxirq:
|
| 745 |
|
|
srxirq1:
|
| 746 |
|
|
inb r1,UART ; get the char (clears interrupt)
|
| 747 |
|
|
lb r2,Uart_txxon
|
| 748 |
|
|
beq r2,r0,srxirq3
|
| 749 |
|
|
bnei r1,#XOFF,srxirq2
|
| 750 |
|
|
setlo r1,#1
|
| 751 |
|
|
sb r1,Uart_txxonoff
|
| 752 |
|
|
bra srxirq5
|
| 753 |
|
|
srxirq2:
|
| 754 |
|
|
bnei r1,#XON,srxirq3
|
| 755 |
|
|
sb r0,Uart_txxonoff
|
| 756 |
|
|
bra srxirq5
|
| 757 |
|
|
srxirq3:
|
| 758 |
|
|
sb r0,Uart_txxonoff
|
| 759 |
|
|
lc r2,Uart_rxhead
|
| 760 |
|
|
lea r3,Uart_rxfifo
|
| 761 |
|
|
sb r1,[r3+r2] ; store in buffer
|
| 762 |
|
|
addui r2,r2,#1
|
| 763 |
|
|
andi r2,r2,#0x1ff
|
| 764 |
|
|
sc r2,Uart_rxhead
|
| 765 |
|
|
srxirq5:
|
| 766 |
|
|
inb r1,UART_LS ; check for another ready character
|
| 767 |
|
|
andi r1,r1,#rxfull
|
| 768 |
|
|
bne r1,r0,srxirq1
|
| 769 |
|
|
lb r1,Uart_rxflow ; are we using flow controls?
|
| 770 |
|
|
bne r1,r0,srxirq8
|
| 771 |
|
|
call CharsInRxBuf
|
| 772 |
|
|
lc r1,Uart_foff
|
| 773 |
|
|
blt r4,r1,srxirq8
|
| 774 |
|
|
setlo r1,#1
|
| 775 |
|
|
sb r1,Uart_rxflow
|
| 776 |
|
|
lb r1,Uart_rxrts
|
| 777 |
|
|
beq r1,r0,srxirq6
|
| 778 |
|
|
inb r1,UART_MC
|
| 779 |
|
|
andi r1,r1,#0xFD ; turn off RTS
|
| 780 |
|
|
outb r1,UART_MC
|
| 781 |
|
|
srxirq6:
|
| 782 |
|
|
lb r1,Uart_rxdtr
|
| 783 |
|
|
beq r1,r0,srxirq7
|
| 784 |
|
|
inb r1,UART_MC
|
| 785 |
|
|
andi r1,r1,#0xFE ; turn off DTR
|
| 786 |
|
|
outb r1,UART_MC
|
| 787 |
|
|
srxirq7:
|
| 788 |
|
|
lb r1,Uart_rxxon
|
| 789 |
|
|
beq r1,r0,srxirq8
|
| 790 |
|
|
setlo r1,#XOFF
|
| 791 |
|
|
outb r1,UART
|
| 792 |
|
|
srxirq8:
|
| 793 |
|
|
bra sirq1
|
| 794 |
|
|
|
| 795 |
27 |
robfinch |
;==============================================================================
|
| 796 |
43 |
robfinch |
; Keyboard BIOS
|
| 797 |
|
|
; BIOS interrupt #417
|
| 798 |
|
|
;
|
| 799 |
|
|
; Function in R1
|
| 800 |
|
|
; 0 = initialize keyboard
|
| 801 |
|
|
; 1 = set keyboard echo
|
| 802 |
|
|
; 2 = get keyboard character
|
| 803 |
|
|
; 3 = check for key available
|
| 804 |
27 |
robfinch |
;==============================================================================
|
| 805 |
43 |
robfinch |
;
|
| 806 |
|
|
KeybdSC:
|
| 807 |
|
|
subui sp,sp,#8
|
| 808 |
|
|
sw lr,[sp]
|
| 809 |
|
|
bnei r1,#0,kbdsc1
|
| 810 |
|
|
call KeybdInit
|
| 811 |
|
|
bra kbdscRet
|
| 812 |
|
|
kbdsc1:
|
| 813 |
|
|
bnei r1,#1,kbdsc2
|
| 814 |
|
|
mov r1,r2
|
| 815 |
|
|
call SetKeyboardEcho
|
| 816 |
|
|
bra kbdscRet
|
| 817 |
|
|
kbdsc2:
|
| 818 |
|
|
bnei r1,#2,kbdsc3
|
| 819 |
|
|
call KeybdGetChar
|
| 820 |
|
|
bra kbdscRet
|
| 821 |
|
|
kbdsc3:
|
| 822 |
|
|
bnei r1,#3,kbdsc4
|
| 823 |
|
|
call KeybdCheckForKey
|
| 824 |
|
|
bra kbdscRet
|
| 825 |
|
|
kbdsc4:
|
| 826 |
|
|
kbdscRet:
|
| 827 |
|
|
lw lr,[sp]
|
| 828 |
|
|
addui sp,sp,#8
|
| 829 |
|
|
eret
|
| 830 |
|
|
|
| 831 |
27 |
robfinch |
;------------------------------------------------------------------------------
|
| 832 |
|
|
; Initialize keyboard
|
| 833 |
|
|
;------------------------------------------------------------------------------
|
| 834 |
|
|
KeybdInit:
|
| 835 |
|
|
sb r0,KeybdHead
|
| 836 |
|
|
sb r0,KeybdTail
|
| 837 |
|
|
setlo r1,#1 ; turn on keyboard echo
|
| 838 |
|
|
sb r1,KeybdEcho
|
| 839 |
|
|
ret
|
| 840 |
|
|
|
| 841 |
|
|
;------------------------------------------------------------------------------
|
| 842 |
|
|
; Normal keyboard interrupt, the lowest priority interrupt in the system.
|
| 843 |
|
|
; Grab the character from the keyboard device and store it in a buffer.
|
| 844 |
|
|
;------------------------------------------------------------------------------
|
| 845 |
|
|
;
|
| 846 |
|
|
KeybdIRQ:
|
| 847 |
43 |
robfinch |
subui sp,sp,#8
|
| 848 |
|
|
sw r2,[sp]
|
| 849 |
27 |
robfinch |
lbu r1,KeybdHead
|
| 850 |
|
|
andi r1,r1,#0x0f ; r1 = index into buffer
|
| 851 |
|
|
KeybdIRQa:
|
| 852 |
|
|
inch r2,KEYBD ; get keyboard character
|
| 853 |
|
|
outc r0,KEYBD+2 ; clear keyboard strobe (turns off the IRQ)
|
| 854 |
43 |
robfinch |
sb r2,KeybdBuffer[r1] ; store character in buffer
|
| 855 |
27 |
robfinch |
addui r1,r1,#1 ; increment head index
|
| 856 |
|
|
andi r1,r1,#0x0f
|
| 857 |
|
|
sb r1,KeybdHead
|
| 858 |
|
|
KeybdIRQb:
|
| 859 |
|
|
lbu r2,KeybdTail ; check to see if we've collided
|
| 860 |
|
|
bne r1,r2,KeybdIRQc ; with the tail
|
| 861 |
|
|
addui r2,r2,#1 ; if so, increment the tail index
|
| 862 |
|
|
andi r2,r2,#0x0f ; the oldest character will be lost
|
| 863 |
|
|
sb r2,KeybdTail
|
| 864 |
|
|
KeybdIRQc:
|
| 865 |
43 |
robfinch |
lw r2,[sp]
|
| 866 |
|
|
ret #8
|
| 867 |
27 |
robfinch |
|
| 868 |
|
|
;------------------------------------------------------------------------------
|
| 869 |
|
|
; r1 0=echo off, non-zero = echo on
|
| 870 |
|
|
;------------------------------------------------------------------------------
|
| 871 |
|
|
SetKeyboardEcho:
|
| 872 |
|
|
sb r1,KeybdEcho
|
| 873 |
|
|
ret
|
| 874 |
|
|
|
| 875 |
|
|
;-----------------------------------------
|
| 876 |
|
|
; Get character from keyboard buffer
|
| 877 |
|
|
;-----------------------------------------
|
| 878 |
|
|
KeybdGetChar:
|
| 879 |
|
|
subui sp,sp,#16
|
| 880 |
43 |
robfinch |
sw r2,[sp]
|
| 881 |
|
|
sw lr,8[sp]
|
| 882 |
27 |
robfinch |
lbu r2,KeybdTail
|
| 883 |
|
|
lbu r1,KeybdHead
|
| 884 |
|
|
beq r1,r2,nochar
|
| 885 |
43 |
robfinch |
lbu r1,KeybdBuffer[r2]
|
| 886 |
27 |
robfinch |
addui r2,r2,#1
|
| 887 |
|
|
andi r2,r2,#0x0f
|
| 888 |
|
|
sb r2,KeybdTail
|
| 889 |
43 |
robfinch |
lb r2,KeybdEcho
|
| 890 |
|
|
beq r2,r0,kgc3
|
| 891 |
|
|
bnei r1,#CR,kgc2
|
| 892 |
|
|
call CRLF ; convert CR keystroke into CRLF
|
| 893 |
|
|
bra kgc3
|
| 894 |
|
|
kgc2:
|
| 895 |
|
|
call DisplayChar
|
| 896 |
|
|
bra kgc3
|
| 897 |
27 |
robfinch |
nochar:
|
| 898 |
|
|
setlo r1,#-1
|
| 899 |
43 |
robfinch |
kgc3:
|
| 900 |
|
|
lw lr,8[sp]
|
| 901 |
|
|
lw r2,[sp]
|
| 902 |
27 |
robfinch |
ret #16
|
| 903 |
|
|
|
| 904 |
|
|
;------------------------------------------------------------------------------
|
| 905 |
|
|
; Check if there is a keyboard character available in the keyboard buffer.
|
| 906 |
|
|
;------------------------------------------------------------------------------
|
| 907 |
|
|
;
|
| 908 |
|
|
KeybdCheckForKey:
|
| 909 |
|
|
lbu r1,KeybdTail
|
| 910 |
|
|
lbu r2,KeybdHead
|
| 911 |
43 |
robfinch |
sne r1,r1,r2
|
| 912 |
27 |
robfinch |
ret
|
| 913 |
|
|
|
| 914 |
|
|
;------------------------------------------------------------------------------
|
| 915 |
|
|
; Check if there is a keyboard character available. If so return true (1)
|
| 916 |
|
|
; otherwise return false (0) in r1.
|
| 917 |
|
|
;------------------------------------------------------------------------------
|
| 918 |
|
|
;
|
| 919 |
|
|
KeybdCheckForKeyDirect:
|
| 920 |
|
|
inch r1,KEYBD
|
| 921 |
43 |
robfinch |
slt r1,r1,r0
|
| 922 |
27 |
robfinch |
ret
|
| 923 |
|
|
|
| 924 |
|
|
;------------------------------------------------------------------------------
|
| 925 |
|
|
; Get character directly from keyboard. This routine blocks until a key is
|
| 926 |
|
|
; available.
|
| 927 |
|
|
;------------------------------------------------------------------------------
|
| 928 |
|
|
;
|
| 929 |
|
|
KeybdGetCharDirect:
|
| 930 |
|
|
subui sp,sp,#16
|
| 931 |
43 |
robfinch |
sw r2,[sp]
|
| 932 |
|
|
sw lr,8[sp]
|
| 933 |
27 |
robfinch |
setlo r2,KEYBD
|
| 934 |
|
|
kgc1:
|
| 935 |
|
|
inch r1,KEYBD
|
| 936 |
|
|
bge r1,r0,kgc1
|
| 937 |
|
|
outc r0,KEYBD+2 ; clear keyboard strobe
|
| 938 |
|
|
andi r1,r1,#0xff ; remove strobe bit
|
| 939 |
|
|
lb r2,KeybdEcho ; is keyboard echo on ?
|
| 940 |
|
|
beq r2,r0,gk1
|
| 941 |
|
|
bnei r1,#'\r',gk2 ; convert CR keystroke into CRLF
|
| 942 |
|
|
call CRLF
|
| 943 |
|
|
bra gk1
|
| 944 |
|
|
gk2:
|
| 945 |
|
|
call DisplayChar
|
| 946 |
|
|
gk1:
|
| 947 |
43 |
robfinch |
lw r2,[sp]
|
| 948 |
|
|
lw lr,8[sp]
|
| 949 |
27 |
robfinch |
ret #16
|
| 950 |
|
|
|
| 951 |
|
|
;==============================================================================
|
| 952 |
|
|
;==============================================================================
|
| 953 |
|
|
;------------------------------------------------------------------------------
|
| 954 |
43 |
robfinch |
; 100 Hz interrupt
|
| 955 |
27 |
robfinch |
; - takes care of "flashing" the cursor
|
| 956 |
|
|
;------------------------------------------------------------------------------
|
| 957 |
|
|
;
|
| 958 |
43 |
robfinch |
Pulse100:
|
| 959 |
|
|
subui sp,sp,#8
|
| 960 |
|
|
sw lr,[sp]
|
| 961 |
|
|
lea r2,TEXTSCR
|
| 962 |
|
|
inch r1,334[r2]
|
| 963 |
27 |
robfinch |
addui r1,r1,#1
|
| 964 |
43 |
robfinch |
outc r1,334[r2]
|
| 965 |
|
|
call DisplayDatetime
|
| 966 |
|
|
call SelectNextToRunTCB
|
| 967 |
|
|
call SwitchTask
|
| 968 |
|
|
sb r0,0xFFFF_FFFF_FFFF_0010 ; clear interrupt
|
| 969 |
|
|
; lw r1,TickIRQAddr
|
| 970 |
|
|
; jal r31,[r1]
|
| 971 |
|
|
; lw r1,Milliseconds
|
| 972 |
|
|
; andi r1,r1,#0x0f
|
| 973 |
|
|
; bnei r1,#5,p1001
|
| 974 |
|
|
; call FlashCursor
|
| 975 |
|
|
p1001:
|
| 976 |
|
|
lw lr,[sp]
|
| 977 |
|
|
ret #8
|
| 978 |
27 |
robfinch |
|
| 979 |
|
|
;------------------------------------------------------------------------------
|
| 980 |
43 |
robfinch |
;------------------------------------------------------------------------------
|
| 981 |
|
|
SelectNextToRunTCB:
|
| 982 |
|
|
sc r0,NextToRunTCB
|
| 983 |
|
|
ret
|
| 984 |
|
|
|
| 985 |
|
|
;------------------------------------------------------------------------------
|
| 986 |
|
|
; Switch from the RunningTCB to the NextToRunTCB
|
| 987 |
|
|
;------------------------------------------------------------------------------
|
| 988 |
|
|
SwitchTask:
|
| 989 |
|
|
sw r1,r1save
|
| 990 |
|
|
sw r2,r2save
|
| 991 |
|
|
lcu r1,NextToRunTCB
|
| 992 |
|
|
lcu r2,RunningTCB
|
| 993 |
|
|
bne r1,r2,swtsk1 ; are we already running this TCB ?
|
| 994 |
|
|
lw r1,r1save
|
| 995 |
|
|
lw r2,r2save
|
| 996 |
|
|
ret
|
| 997 |
|
|
swtsk1:
|
| 998 |
|
|
andi r2,r2,#0x1ff ; max 512 TCB's
|
| 999 |
|
|
mului r2,r2,#TCBSize
|
| 1000 |
|
|
addui r2,r2,#TCBBase
|
| 1001 |
|
|
lw r1,r1save ; get back r1
|
| 1002 |
|
|
sw r1,TCBr1[r2]
|
| 1003 |
|
|
lw r1,r2save ; get back r2
|
| 1004 |
|
|
sw r1,TCBr2[r2]
|
| 1005 |
|
|
sw r3,TCBr3[r2]
|
| 1006 |
|
|
sw r4,TCBr4[r2]
|
| 1007 |
|
|
sw r5,TCBr5[r2]
|
| 1008 |
|
|
sw r6,TCBr6[r2]
|
| 1009 |
|
|
sw r7,TCBr7[r2]
|
| 1010 |
|
|
sw r8,TCBr8[r2]
|
| 1011 |
|
|
sw r9,TCBr9[r2]
|
| 1012 |
|
|
sw r10,TCBr10[r2]
|
| 1013 |
|
|
sw r11,TCBr11[r2]
|
| 1014 |
|
|
sw r12,TCBr12[r2]
|
| 1015 |
|
|
sw r13,TCBr13[r2]
|
| 1016 |
|
|
sw r14,TCBr14[r2]
|
| 1017 |
|
|
sw r15,TCBr15[r2]
|
| 1018 |
|
|
sw r16,TCBr16[r2]
|
| 1019 |
|
|
sw r17,TCBr17[r2]
|
| 1020 |
|
|
sw r18,TCBr18[r2]
|
| 1021 |
|
|
sw r19,TCBr19[r2]
|
| 1022 |
|
|
sw r20,TCBr20[r2]
|
| 1023 |
|
|
sw r21,TCBr21[r2]
|
| 1024 |
|
|
sw r22,TCBr22[r2]
|
| 1025 |
|
|
sw r23,TCBr23[r2]
|
| 1026 |
|
|
sw r24,TCBr24[r2]
|
| 1027 |
|
|
sw r25,TCBr25[r2]
|
| 1028 |
|
|
sw r26,TCBr26[r2]
|
| 1029 |
|
|
sw r27,TCBr27[r2]
|
| 1030 |
|
|
sw r28,TCBr28[r2]
|
| 1031 |
|
|
sw r29,TCBr29[r2]
|
| 1032 |
|
|
sw r30,TCBr30[r2]
|
| 1033 |
|
|
sw r31,TCBr31[r2]
|
| 1034 |
|
|
|
| 1035 |
|
|
lcu r2,NextToRunTCB
|
| 1036 |
|
|
sc r2,RunningTCB
|
| 1037 |
|
|
mului r2,r2,#TCBSize
|
| 1038 |
|
|
addui r2,r2,#TCBBase
|
| 1039 |
|
|
|
| 1040 |
|
|
lw r1,TCBr1[r2]
|
| 1041 |
|
|
lw r3,TCBr3[r2]
|
| 1042 |
|
|
lw r4,TCBr4[r2]
|
| 1043 |
|
|
lw r5,TCBr5[r2]
|
| 1044 |
|
|
lw r6,TCBr6[r2]
|
| 1045 |
|
|
lw r7,TCBr7[r2]
|
| 1046 |
|
|
lw r8,TCBr8[r2]
|
| 1047 |
|
|
lw r9,TCBr9[r2]
|
| 1048 |
|
|
lw r10,TCBr10[r2]
|
| 1049 |
|
|
lw r11,TCBr11[r2]
|
| 1050 |
|
|
lw r12,TCBr12[r2]
|
| 1051 |
|
|
lw r13,TCBr13[r2]
|
| 1052 |
|
|
lw r14,TCBr14[r2]
|
| 1053 |
|
|
lw r15,TCBr15[r2]
|
| 1054 |
|
|
lw r16,TCBr16[r2]
|
| 1055 |
|
|
lw r17,TCBr17[r2]
|
| 1056 |
|
|
lw r18,TCBr18[r2]
|
| 1057 |
|
|
lw r19,TCBr19[r2]
|
| 1058 |
|
|
lw r20,TCBr20[r2]
|
| 1059 |
|
|
lw r21,TCBr21[r2]
|
| 1060 |
|
|
lw r22,TCBr22[r2]
|
| 1061 |
|
|
lw r23,TCBr23[r2]
|
| 1062 |
|
|
lw r24,TCBr24[r2]
|
| 1063 |
|
|
lw r25,TCBr25[r2]
|
| 1064 |
|
|
lw r26,TCBr26[r2]
|
| 1065 |
|
|
lw r27,TCBr27[r2]
|
| 1066 |
|
|
lw r28,TCBr28[r2]
|
| 1067 |
|
|
lw r29,TCBr29[r2]
|
| 1068 |
|
|
lw r30,TCBr30[r2]
|
| 1069 |
|
|
lw r31,TCBr31[r2]
|
| 1070 |
|
|
lw r2,TCBr2[r2]
|
| 1071 |
|
|
ret
|
| 1072 |
|
|
|
| 1073 |
|
|
;------------------------------------------------------------------------------
|
| 1074 |
27 |
robfinch |
; Flash Cursor
|
| 1075 |
|
|
;------------------------------------------------------------------------------
|
| 1076 |
|
|
;
|
| 1077 |
|
|
FlashCursor:
|
| 1078 |
|
|
subui sp,sp,#32
|
| 1079 |
43 |
robfinch |
sw r1,[sp]
|
| 1080 |
|
|
sw r2,8[sp]
|
| 1081 |
|
|
sw r3,16[sp]
|
| 1082 |
|
|
sw lr,24[sp]
|
| 1083 |
27 |
robfinch |
call CalcScreenLoc
|
| 1084 |
|
|
addui r1,r1,#0x10000
|
| 1085 |
43 |
robfinch |
lb r2,CursorFlash
|
| 1086 |
|
|
beq r2,r0,flshcrsr2
|
| 1087 |
27 |
robfinch |
; causes screen colors to flip around
|
| 1088 |
43 |
robfinch |
inch r2,[r1]
|
| 1089 |
27 |
robfinch |
addui r2,r2,#1
|
| 1090 |
43 |
robfinch |
outc r2,[r1]
|
| 1091 |
|
|
flshcrsr3:
|
| 1092 |
27 |
robfinch |
lw r2,Lastloc
|
| 1093 |
|
|
beq r1,r2,flshcrsr1
|
| 1094 |
|
|
; restore the screen colors of the previous cursor location
|
| 1095 |
|
|
lc r3,ScreenColor
|
| 1096 |
43 |
robfinch |
outc r3,[r2]
|
| 1097 |
27 |
robfinch |
sw r1,Lastloc
|
| 1098 |
|
|
flshcrsr1:
|
| 1099 |
43 |
robfinch |
lw r1,[sp]
|
| 1100 |
|
|
lw r2,8[sp]
|
| 1101 |
|
|
lw r3,16[sp]
|
| 1102 |
|
|
lw lr,24[sp]
|
| 1103 |
27 |
robfinch |
ret #32
|
| 1104 |
43 |
robfinch |
flshcrsr2:
|
| 1105 |
|
|
lc r3,ScreenColor
|
| 1106 |
|
|
outc r3,[r1]
|
| 1107 |
|
|
bra flshcrsr3
|
| 1108 |
27 |
robfinch |
|
| 1109 |
43 |
robfinch |
CursorOff:
|
| 1110 |
|
|
lw r1,#0xA0
|
| 1111 |
|
|
outc r1,TEXTREG+16 ; turn off cursor
|
| 1112 |
|
|
ret
|
| 1113 |
|
|
CursorOn:
|
| 1114 |
|
|
lw r1,#0xE0
|
| 1115 |
|
|
outc r1,TEXTREG+16 ; turn on cursor
|
| 1116 |
|
|
ret
|
| 1117 |
|
|
|
| 1118 |
27 |
robfinch |
;------------------------------------------------------------------------------
|
| 1119 |
|
|
;------------------------------------------------------------------------------
|
| 1120 |
|
|
ClearBmpScreen:
|
| 1121 |
43 |
robfinch |
subui sp,sp,#24
|
| 1122 |
|
|
sw r1,[sp]
|
| 1123 |
|
|
sw r2,8[sp]
|
| 1124 |
|
|
sw r3,16[sp]
|
| 1125 |
|
|
lw r2,#1364*768
|
| 1126 |
|
|
shrui r2,r2,#3 ; r2 = # words to clear
|
| 1127 |
|
|
lea r1,0x2929292929292929 ; r1 = color for eight pixels
|
| 1128 |
|
|
lea r3,BITMAPSCR ; r3 = screen address
|
| 1129 |
27 |
robfinch |
csj4:
|
| 1130 |
43 |
robfinch |
sw r1,[r3] ; store pixel data
|
| 1131 |
|
|
addui r3,r3,#8 ; advance screen address by eight
|
| 1132 |
|
|
loop r2,csj4 ; decrement pixel count and loop back
|
| 1133 |
|
|
lw r1,[sp]
|
| 1134 |
|
|
lw r2,8[sp]
|
| 1135 |
|
|
lw r3,16[sp]
|
| 1136 |
|
|
ret #24
|
| 1137 |
27 |
robfinch |
|
| 1138 |
|
|
;------------------------------------------------------------------------------
|
| 1139 |
|
|
; Clear the screen and the screen color memory
|
| 1140 |
|
|
; We clear the screen to give a visual indication that the system
|
| 1141 |
|
|
; is working at all.
|
| 1142 |
|
|
;------------------------------------------------------------------------------
|
| 1143 |
|
|
;
|
| 1144 |
|
|
ClearScreen:
|
| 1145 |
|
|
subui sp,sp,#40
|
| 1146 |
43 |
robfinch |
sw r1,[sp]
|
| 1147 |
|
|
sw r2,8[sp]
|
| 1148 |
|
|
sw r3,16[sp]
|
| 1149 |
|
|
sw r4,24[sp]
|
| 1150 |
|
|
sw lr,32[sp]
|
| 1151 |
|
|
lea r3,TEXTREG
|
| 1152 |
|
|
inch r1,TEXT_COLS[r3] ; calc number to clear
|
| 1153 |
|
|
inch r2,TEXT_ROWS[r3]
|
| 1154 |
27 |
robfinch |
mulu r2,r1,r2 ; r2 = # chars to clear
|
| 1155 |
|
|
setlo r1,#32 ; space char
|
| 1156 |
|
|
lc r4,ScreenColor
|
| 1157 |
|
|
call AsciiToScreen
|
| 1158 |
43 |
robfinch |
lea r3,TEXTSCR ; text screen address
|
| 1159 |
27 |
robfinch |
csj4:
|
| 1160 |
43 |
robfinch |
outc r1,[r3]
|
| 1161 |
|
|
outc r4,0x10000[r3] ; color screen is 0x10000 higher
|
| 1162 |
|
|
addui r3,r3,#2
|
| 1163 |
27 |
robfinch |
loop r2,csj4
|
| 1164 |
43 |
robfinch |
lw lr,32[sp]
|
| 1165 |
|
|
lw r4,24[sp]
|
| 1166 |
|
|
lw r3,16[sp]
|
| 1167 |
|
|
lw r2,8[sp]
|
| 1168 |
|
|
lw r1,[sp]
|
| 1169 |
27 |
robfinch |
ret #40
|
| 1170 |
|
|
|
| 1171 |
|
|
;------------------------------------------------------------------------------
|
| 1172 |
|
|
; Scroll text on the screen upwards
|
| 1173 |
|
|
;------------------------------------------------------------------------------
|
| 1174 |
|
|
;
|
| 1175 |
|
|
ScrollUp:
|
| 1176 |
|
|
subui sp,sp,#40
|
| 1177 |
43 |
robfinch |
sw r1,[sp]
|
| 1178 |
|
|
sw r2,8[sp]
|
| 1179 |
|
|
sw r3,16[sp]
|
| 1180 |
|
|
sw r4,24[sp]
|
| 1181 |
|
|
sw lr,32[sp]
|
| 1182 |
|
|
lea r3,TEXTREG
|
| 1183 |
|
|
inch r1,TEXT_COLS[r3] ; r1 = # text columns
|
| 1184 |
|
|
inch r2,TEXT_ROWS[r3]
|
| 1185 |
27 |
robfinch |
mulu r2,r1,r2 ; calc number of chars to scroll
|
| 1186 |
|
|
subu r2,r2,r1 ; one less row
|
| 1187 |
43 |
robfinch |
lea r3,TEXTSCR
|
| 1188 |
27 |
robfinch |
scrup1:
|
| 1189 |
43 |
robfinch |
inch r4,[r3+r1] ; indexed addressing example
|
| 1190 |
|
|
outc r4,[r3]
|
| 1191 |
27 |
robfinch |
addui r3,r3,#2
|
| 1192 |
|
|
loop r2,scrup1
|
| 1193 |
|
|
|
| 1194 |
43 |
robfinch |
lea r3,TEXTREG
|
| 1195 |
|
|
inch r1,TEXT_ROWS[r3]
|
| 1196 |
27 |
robfinch |
subui r1,r1,#1
|
| 1197 |
|
|
call BlankLine
|
| 1198 |
43 |
robfinch |
lw r1,[sp]
|
| 1199 |
|
|
lw r2,8[sp]
|
| 1200 |
|
|
lw r3,16[sp]
|
| 1201 |
|
|
lw r4,24[sp]
|
| 1202 |
|
|
lw lr,32[sp]
|
| 1203 |
27 |
robfinch |
ret #40
|
| 1204 |
|
|
|
| 1205 |
|
|
;------------------------------------------------------------------------------
|
| 1206 |
|
|
; Blank out a line on the display
|
| 1207 |
|
|
; line number to blank is in r1
|
| 1208 |
|
|
;------------------------------------------------------------------------------
|
| 1209 |
|
|
;
|
| 1210 |
|
|
BlankLine:
|
| 1211 |
|
|
subui sp,sp,#24
|
| 1212 |
43 |
robfinch |
sw r1,[sp]
|
| 1213 |
|
|
sw r2,8[sp]
|
| 1214 |
|
|
sw r3,16[sp]
|
| 1215 |
|
|
lea r3,TEXTREG ; r3 = text register address
|
| 1216 |
|
|
inch r2,TEXT_COLS[r3] ; r2 = # chars to blank out
|
| 1217 |
27 |
robfinch |
mulu r3,r2,r1
|
| 1218 |
|
|
shli r3,r3,#1
|
| 1219 |
|
|
addui r3,r3,#TEXTSCR ; r3 = screen address
|
| 1220 |
|
|
setlo r1,#' '
|
| 1221 |
|
|
blnkln1:
|
| 1222 |
43 |
robfinch |
outc r1,[r3]
|
| 1223 |
27 |
robfinch |
addui r3,r3,#2
|
| 1224 |
|
|
loop r2,blnkln1
|
| 1225 |
43 |
robfinch |
lw r1,[sp]
|
| 1226 |
|
|
lw r2,8[sp]
|
| 1227 |
|
|
lw r3,16[sp]
|
| 1228 |
27 |
robfinch |
ret #24
|
| 1229 |
|
|
|
| 1230 |
|
|
;------------------------------------------------------------------------------
|
| 1231 |
|
|
; Convert ASCII character to screen display character.
|
| 1232 |
|
|
;------------------------------------------------------------------------------
|
| 1233 |
|
|
;
|
| 1234 |
|
|
AsciiToScreen:
|
| 1235 |
|
|
andi r1,r1,#0x00ff
|
| 1236 |
|
|
bltui r1,#'A',atoscr1
|
| 1237 |
|
|
bleui r1,#'Z',atoscr1
|
| 1238 |
|
|
bgtui r1,#'z',atoscr1
|
| 1239 |
|
|
bltui r1,#'a',atoscr1
|
| 1240 |
|
|
subi r1,r1,#0x60
|
| 1241 |
|
|
atoscr1:
|
| 1242 |
|
|
ori r1,r1,#0x100
|
| 1243 |
|
|
ret
|
| 1244 |
|
|
|
| 1245 |
|
|
;------------------------------------------------------------------------------
|
| 1246 |
|
|
; Convert screen character to ascii character
|
| 1247 |
|
|
;------------------------------------------------------------------------------
|
| 1248 |
|
|
;
|
| 1249 |
|
|
ScreenToAscii:
|
| 1250 |
|
|
andi r1,r1,#0xff
|
| 1251 |
|
|
bgtui r1,#26,stasc1
|
| 1252 |
|
|
addui r1,r1,#60
|
| 1253 |
|
|
stasc1:
|
| 1254 |
|
|
ret
|
| 1255 |
|
|
|
| 1256 |
|
|
;------------------------------------------------------------------------------
|
| 1257 |
|
|
; Calculate screen memory location from CursorRow,CursorCol.
|
| 1258 |
|
|
; Also refreshes the cursor location.
|
| 1259 |
|
|
; Destroys r1,r2,r3
|
| 1260 |
|
|
; r1 = screen location
|
| 1261 |
|
|
;------------------------------------------------------------------------------
|
| 1262 |
|
|
;
|
| 1263 |
|
|
CalcScreenLoc:
|
| 1264 |
|
|
lc r1,CursorRow
|
| 1265 |
|
|
andi r1,r1,#0x7f
|
| 1266 |
43 |
robfinch |
lea r3,TEXTREG
|
| 1267 |
27 |
robfinch |
inch r2,TEXT_COLS[r3]
|
| 1268 |
|
|
mulu r2,r2,r1
|
| 1269 |
|
|
lc r1,CursorCol
|
| 1270 |
|
|
andi r1,r1,#0x7f
|
| 1271 |
|
|
addu r2,r2,r1
|
| 1272 |
|
|
outc r2,TEXT_CURPOS[r3]
|
| 1273 |
|
|
shli r2,r2,#1
|
| 1274 |
|
|
addui r1,r2,#TEXTSCR ; r1 = screen location
|
| 1275 |
|
|
ret
|
| 1276 |
|
|
|
| 1277 |
|
|
;------------------------------------------------------------------------------
|
| 1278 |
|
|
; Display a character on the screen
|
| 1279 |
|
|
; d1.b = char to display
|
| 1280 |
|
|
;------------------------------------------------------------------------------
|
| 1281 |
|
|
;
|
| 1282 |
|
|
DisplayChar:
|
| 1283 |
|
|
bnei r1,#'\r',dccr ; carriage return ?
|
| 1284 |
|
|
subui sp,sp,#32
|
| 1285 |
43 |
robfinch |
sw r1,[sp]
|
| 1286 |
|
|
sw r2,8[sp]
|
| 1287 |
|
|
sw r3,16[sp]
|
| 1288 |
|
|
sw lr,24[sp]
|
| 1289 |
27 |
robfinch |
sc r0,CursorCol ; just set cursor column to zero on a CR
|
| 1290 |
|
|
bra dcx7
|
| 1291 |
|
|
dccr:
|
| 1292 |
|
|
bnei r1,#0x91,dcx6 ; cursor right ?
|
| 1293 |
|
|
subui sp,sp,#32
|
| 1294 |
43 |
robfinch |
sw r1,[sp]
|
| 1295 |
|
|
sw r2,8[sp]
|
| 1296 |
|
|
sw r3,16[sp]
|
| 1297 |
|
|
sw lr,24[sp]
|
| 1298 |
27 |
robfinch |
lc r2,CursorCol
|
| 1299 |
|
|
beqi r2,#56,dcx7
|
| 1300 |
|
|
addui r2,r2,#1
|
| 1301 |
|
|
sc r2,CursorCol
|
| 1302 |
|
|
dcx7:
|
| 1303 |
|
|
call CalcScreenLoc
|
| 1304 |
43 |
robfinch |
lw lr,24[sp]
|
| 1305 |
|
|
lw r3,16[sp]
|
| 1306 |
|
|
lw r2,8[sp]
|
| 1307 |
|
|
lw r1,[sp]
|
| 1308 |
27 |
robfinch |
ret #32
|
| 1309 |
|
|
dcx6:
|
| 1310 |
|
|
bnei r1,#0x90,dcx8 ; cursor up ?
|
| 1311 |
|
|
subui sp,sp,#32
|
| 1312 |
43 |
robfinch |
sw r1,[sp]
|
| 1313 |
|
|
sw r2,8[sp]
|
| 1314 |
|
|
sw r3,16[sp]
|
| 1315 |
|
|
sw lr,24[sp]
|
| 1316 |
27 |
robfinch |
lc r2,CursorRow
|
| 1317 |
|
|
beqi r2,#0,dcx7
|
| 1318 |
|
|
subui r2,r2,#1
|
| 1319 |
|
|
sc r2,CursorRow
|
| 1320 |
|
|
bra dcx7
|
| 1321 |
|
|
dcx8:
|
| 1322 |
|
|
bnei r1,#0x93,dcx9 ; cursor left ?
|
| 1323 |
|
|
subui sp,sp,#32
|
| 1324 |
43 |
robfinch |
sw r1,[sp]
|
| 1325 |
|
|
sw r2,8[sp]
|
| 1326 |
|
|
sw r3,16[sp]
|
| 1327 |
|
|
sw lr,24[sp]
|
| 1328 |
27 |
robfinch |
lc r2,CursorCol
|
| 1329 |
|
|
beqi r2,#0,dcx7
|
| 1330 |
|
|
subui r2,r2,#1
|
| 1331 |
|
|
sc r2,CursorCol
|
| 1332 |
|
|
bra dcx7
|
| 1333 |
|
|
dcx9:
|
| 1334 |
|
|
bnei r1,#0x92,dcx10 ; cursor down ?
|
| 1335 |
|
|
subui sp,sp,#32
|
| 1336 |
43 |
robfinch |
sw r1,[sp]
|
| 1337 |
|
|
sw r2,8[sp]
|
| 1338 |
|
|
sw r3,16[sp]
|
| 1339 |
|
|
sw lr,24[sp]
|
| 1340 |
27 |
robfinch |
lc r2,CursorRow
|
| 1341 |
|
|
beqi r2,#30,dcx7
|
| 1342 |
|
|
addui r2,r2,#1
|
| 1343 |
|
|
sc r2,CursorRow
|
| 1344 |
|
|
bra dcx7
|
| 1345 |
|
|
dcx10:
|
| 1346 |
|
|
bnei r1,#0x94,dcx11 ; cursor home ?
|
| 1347 |
|
|
subui sp,sp,#32
|
| 1348 |
43 |
robfinch |
sw r1,[sp]
|
| 1349 |
|
|
sw r2,8[sp]
|
| 1350 |
|
|
sw r3,16[sp]
|
| 1351 |
|
|
sw lr,24[sp]
|
| 1352 |
27 |
robfinch |
lc r2,CursorCol
|
| 1353 |
|
|
beq r2,r0,dcx12
|
| 1354 |
|
|
sc r0,CursorCol
|
| 1355 |
|
|
bra dcx7
|
| 1356 |
|
|
dcx12:
|
| 1357 |
|
|
sc r0,CursorRow
|
| 1358 |
|
|
bra dcx7
|
| 1359 |
|
|
dcx11:
|
| 1360 |
|
|
subui sp,sp,#48
|
| 1361 |
43 |
robfinch |
sw r1,[sp]
|
| 1362 |
|
|
sw r2,8[sp]
|
| 1363 |
|
|
sw r3,16[sp]
|
| 1364 |
|
|
sw r4,24[sp]
|
| 1365 |
|
|
sw r5,32[sp]
|
| 1366 |
|
|
sw lr,40[sp]
|
| 1367 |
27 |
robfinch |
bnei r1,#0x99,dcx13 ; delete ?
|
| 1368 |
|
|
call CalcScreenLoc
|
| 1369 |
|
|
or r3,r0,r1 ; r3 = screen location
|
| 1370 |
|
|
lc r1,CursorCol ; r1 = cursor column
|
| 1371 |
|
|
bra dcx5
|
| 1372 |
|
|
dcx13:
|
| 1373 |
|
|
bnei r1,#CTRLH,dcx3 ; backspace ?
|
| 1374 |
|
|
lc r2,CursorCol
|
| 1375 |
|
|
beq r2,r0,dcx4
|
| 1376 |
|
|
subui r2,r2,#1
|
| 1377 |
|
|
sc r2,CursorCol
|
| 1378 |
|
|
call CalcScreenLoc ; a0 = screen location
|
| 1379 |
|
|
or r3,r0,r1 ; r3 = screen location
|
| 1380 |
|
|
lc r1,CursorCol
|
| 1381 |
|
|
dcx5:
|
| 1382 |
43 |
robfinch |
inch r2,2[r3]
|
| 1383 |
|
|
outc r2,[r3]
|
| 1384 |
27 |
robfinch |
addui r3,r3,#2
|
| 1385 |
|
|
addui r1,r1,#1
|
| 1386 |
43 |
robfinch |
lea r4,TEXTREG
|
| 1387 |
27 |
robfinch |
inch r5,TEXT_COLS[r4]
|
| 1388 |
|
|
bltu r1,r5,dcx5
|
| 1389 |
43 |
robfinch |
setlo r1,#' '
|
| 1390 |
|
|
call AsciiToScreen
|
| 1391 |
|
|
outc r1,-2[r3]
|
| 1392 |
27 |
robfinch |
bra dcx4
|
| 1393 |
|
|
dcx3:
|
| 1394 |
|
|
beqi r1,#'\n',dclf ; linefeed ?
|
| 1395 |
|
|
or r4,r0,r1 ; save r1 in r4
|
| 1396 |
|
|
call CalcScreenLoc ; r1 = screen location
|
| 1397 |
|
|
or r3,r0,r1 ; r3 = screen location
|
| 1398 |
|
|
or r1,r0,r4 ; restore r1
|
| 1399 |
|
|
call AsciiToScreen ; convert ascii char to screen char
|
| 1400 |
43 |
robfinch |
outc r1,[r3]
|
| 1401 |
27 |
robfinch |
call IncCursorPos
|
| 1402 |
43 |
robfinch |
bra dcx4
|
| 1403 |
27 |
robfinch |
dclf:
|
| 1404 |
|
|
call IncCursorRow
|
| 1405 |
|
|
dcx4:
|
| 1406 |
43 |
robfinch |
lw lr,40[sp]
|
| 1407 |
|
|
lw r5,32[sp]
|
| 1408 |
|
|
lw r4,24[sp]
|
| 1409 |
|
|
lw r3,16[sp]
|
| 1410 |
|
|
lw r2,8[sp]
|
| 1411 |
|
|
lw r1,[sp]
|
| 1412 |
27 |
robfinch |
ret #48
|
| 1413 |
|
|
|
| 1414 |
|
|
|
| 1415 |
|
|
;------------------------------------------------------------------------------
|
| 1416 |
|
|
; Increment the cursor position, scroll the screen if needed.
|
| 1417 |
|
|
;------------------------------------------------------------------------------
|
| 1418 |
|
|
;
|
| 1419 |
|
|
IncCursorPos:
|
| 1420 |
|
|
subui sp,sp,#32
|
| 1421 |
43 |
robfinch |
sw r1,[sp]
|
| 1422 |
|
|
sw r2,8[sp]
|
| 1423 |
|
|
sw r3,16[sp]
|
| 1424 |
|
|
sw lr,24[sp]
|
| 1425 |
27 |
robfinch |
lc r1,CursorCol
|
| 1426 |
|
|
addui r1,r1,#1
|
| 1427 |
|
|
sc r1,CursorCol
|
| 1428 |
|
|
inch r2,TEXTREG+TEXT_COLS
|
| 1429 |
|
|
bleu r1,r2,icc1
|
| 1430 |
|
|
sc r0,CursorCol ; column = 0
|
| 1431 |
|
|
bra icr1
|
| 1432 |
|
|
IncCursorRow:
|
| 1433 |
|
|
subui sp,sp,#32
|
| 1434 |
43 |
robfinch |
sw r1,[sp]
|
| 1435 |
|
|
sw r2,8[sp]
|
| 1436 |
|
|
sw r3,16[sp]
|
| 1437 |
|
|
sw lr,24[sp]
|
| 1438 |
27 |
robfinch |
icr1:
|
| 1439 |
|
|
lc r1,CursorRow
|
| 1440 |
|
|
addui r1,r1,#1
|
| 1441 |
|
|
sc r1,CursorRow
|
| 1442 |
|
|
inch r2,TEXTREG+TEXT_ROWS
|
| 1443 |
|
|
bleu r1,r2,icc1
|
| 1444 |
|
|
subui r2,r2,#1 ; backup the cursor row, we are scrolling up
|
| 1445 |
|
|
sc r2,CursorRow
|
| 1446 |
|
|
call ScrollUp
|
| 1447 |
|
|
icc1:
|
| 1448 |
|
|
call CalcScreenLoc
|
| 1449 |
43 |
robfinch |
lw lr,24[sp]
|
| 1450 |
|
|
lw r3,16[sp]
|
| 1451 |
|
|
lw r2,8[sp]
|
| 1452 |
|
|
lw r1,[sp]
|
| 1453 |
27 |
robfinch |
ret #32
|
| 1454 |
|
|
|
| 1455 |
|
|
;------------------------------------------------------------------------------
|
| 1456 |
|
|
; Display a string on the screen.
|
| 1457 |
|
|
;------------------------------------------------------------------------------
|
| 1458 |
|
|
;
|
| 1459 |
|
|
DisplayString:
|
| 1460 |
|
|
subi sp,sp,#24
|
| 1461 |
43 |
robfinch |
sw r1,[sp]
|
| 1462 |
|
|
sw r2,8[sp]
|
| 1463 |
|
|
sw lr,16[sp]
|
| 1464 |
|
|
mov r2,r1 ; r2 = pointer to string
|
| 1465 |
27 |
robfinch |
dspj1:
|
| 1466 |
|
|
lbu r1,[r2] ; move string char into r1
|
| 1467 |
|
|
addui r2,r2,#1 ; increment pointer
|
| 1468 |
|
|
beq r1,r0,dsret ; is it end of string ?
|
| 1469 |
|
|
call DisplayChar ; display character
|
| 1470 |
|
|
bra dspj1 ; go back for next character
|
| 1471 |
|
|
dsret:
|
| 1472 |
43 |
robfinch |
lw lr,16[sp]
|
| 1473 |
|
|
lw r2,8[sp]
|
| 1474 |
|
|
lw r1,[sp]
|
| 1475 |
27 |
robfinch |
ret #24
|
| 1476 |
|
|
|
| 1477 |
|
|
DisplayStringCRLF:
|
| 1478 |
|
|
subui r30,r30,#8
|
| 1479 |
|
|
sw r31,[r30]
|
| 1480 |
|
|
call DisplayString
|
| 1481 |
|
|
lw r31,[r30]
|
| 1482 |
|
|
addui r30,r30,#8
|
| 1483 |
|
|
|
| 1484 |
|
|
CRLF:
|
| 1485 |
|
|
subui r30,r30,#16
|
| 1486 |
43 |
robfinch |
sw r1,[sp]
|
| 1487 |
|
|
sw lr,8[sp]
|
| 1488 |
27 |
robfinch |
setlo r1,#'\r'
|
| 1489 |
|
|
call DisplayChar
|
| 1490 |
|
|
setlo r1,#'\n'
|
| 1491 |
|
|
call DisplayChar
|
| 1492 |
43 |
robfinch |
lw lr,8[sp]
|
| 1493 |
|
|
lw r1,[sp]
|
| 1494 |
27 |
robfinch |
ret #16
|
| 1495 |
|
|
|
| 1496 |
|
|
;------------------------------------------------------------------------------
|
| 1497 |
|
|
; Display nybble in r1
|
| 1498 |
|
|
;------------------------------------------------------------------------------
|
| 1499 |
|
|
;
|
| 1500 |
|
|
DisplayNybble:
|
| 1501 |
43 |
robfinch |
subui sp,sp,#16
|
| 1502 |
|
|
sw r1,[sp]
|
| 1503 |
|
|
sw lr,8[sp]
|
| 1504 |
27 |
robfinch |
andi r1,r1,#0x0F
|
| 1505 |
|
|
addui r1,r1,#'0'
|
| 1506 |
|
|
bleui r1,#'9',dispnyb1
|
| 1507 |
|
|
addui r1,r1,#7
|
| 1508 |
|
|
dispnyb1:
|
| 1509 |
|
|
call DisplayChar
|
| 1510 |
43 |
robfinch |
lw lr,8[sp]
|
| 1511 |
|
|
lw r1,[sp]
|
| 1512 |
27 |
robfinch |
ret #16
|
| 1513 |
|
|
|
| 1514 |
|
|
;------------------------------------------------------------------------------
|
| 1515 |
|
|
; Display the byte in r1
|
| 1516 |
|
|
;------------------------------------------------------------------------------
|
| 1517 |
|
|
;
|
| 1518 |
|
|
DisplayByte:
|
| 1519 |
|
|
subui sp,sp,#16
|
| 1520 |
43 |
robfinch |
sw r1,[sp]
|
| 1521 |
|
|
sw lr,8[sp]
|
| 1522 |
27 |
robfinch |
rori r1,r1,#4
|
| 1523 |
|
|
call DisplayNybble
|
| 1524 |
|
|
roli r1,r1,#4
|
| 1525 |
|
|
call DisplayNybble
|
| 1526 |
43 |
robfinch |
lw lr,8[sp]
|
| 1527 |
|
|
lw r1,[sp]
|
| 1528 |
27 |
robfinch |
ret #16
|
| 1529 |
|
|
|
| 1530 |
|
|
;------------------------------------------------------------------------------
|
| 1531 |
|
|
; Display the 64 bit word in r1
|
| 1532 |
|
|
;------------------------------------------------------------------------------
|
| 1533 |
|
|
;
|
| 1534 |
|
|
DisplayWord:
|
| 1535 |
|
|
subui sp,sp,#24
|
| 1536 |
43 |
robfinch |
sw r1,[sp]
|
| 1537 |
|
|
sw r3,8[sp]
|
| 1538 |
|
|
sw lr,16[sp]
|
| 1539 |
27 |
robfinch |
setlo r3,#7
|
| 1540 |
|
|
dspwd1:
|
| 1541 |
|
|
roli r1,r1,#8
|
| 1542 |
|
|
call DisplayByte
|
| 1543 |
|
|
loop r3,dspwd1
|
| 1544 |
43 |
robfinch |
lw lr,16[sp]
|
| 1545 |
|
|
lw r3,8[sp]
|
| 1546 |
|
|
lw r1,[sp]
|
| 1547 |
27 |
robfinch |
ret #24
|
| 1548 |
|
|
|
| 1549 |
|
|
;------------------------------------------------------------------------------
|
| 1550 |
|
|
; Display memory pointed to by r2.
|
| 1551 |
|
|
; destroys r1,r3
|
| 1552 |
|
|
;------------------------------------------------------------------------------
|
| 1553 |
|
|
;
|
| 1554 |
|
|
DisplayMem:
|
| 1555 |
43 |
robfinch |
subui sp,sp,#24
|
| 1556 |
|
|
sw r1,[sp]
|
| 1557 |
|
|
sw r3,8[sp]
|
| 1558 |
|
|
sw lr,16[sp]
|
| 1559 |
27 |
robfinch |
setlo r1,#':'
|
| 1560 |
|
|
call DisplayChar
|
| 1561 |
43 |
robfinch |
mov r1,r2
|
| 1562 |
27 |
robfinch |
call DisplayWord
|
| 1563 |
|
|
setlo r3,#7
|
| 1564 |
|
|
dspmem1:
|
| 1565 |
|
|
setlo r1,#' '
|
| 1566 |
|
|
call DisplayChar
|
| 1567 |
|
|
lb r1,[r2]
|
| 1568 |
|
|
call DisplayByte
|
| 1569 |
|
|
addui r2,r2,#1
|
| 1570 |
|
|
loop r3,dspmem1
|
| 1571 |
|
|
call CRLF
|
| 1572 |
43 |
robfinch |
lw lr,16[sp]
|
| 1573 |
|
|
lw r3,8[sp]
|
| 1574 |
|
|
lw r1,[sp]
|
| 1575 |
|
|
ret #24
|
| 1576 |
27 |
robfinch |
|
| 1577 |
|
|
;------------------------------------------------------------------------------
|
| 1578 |
|
|
; Converts binary number in r1 into BCD number in r2 and r1.
|
| 1579 |
|
|
;------------------------------------------------------------------------------
|
| 1580 |
|
|
;
|
| 1581 |
|
|
BinToBCD:
|
| 1582 |
|
|
subui sp,sp,#48
|
| 1583 |
43 |
robfinch |
sw r3,[sp]
|
| 1584 |
|
|
sw r4,8[sp]
|
| 1585 |
|
|
sw r5,16[sp]
|
| 1586 |
|
|
sw r6,24[sp]
|
| 1587 |
|
|
sw r7,32[sp]
|
| 1588 |
|
|
sw r8,40[sp]
|
| 1589 |
27 |
robfinch |
setlo r2,#10
|
| 1590 |
|
|
setlo r8,#19 ; number of digits to produce - 1
|
| 1591 |
|
|
bta1:
|
| 1592 |
|
|
mod r3,r1,r2
|
| 1593 |
|
|
shli r3,r3,#60 ; shift result to uppermost bits
|
| 1594 |
|
|
shli r7,r5,#60 ; copy low order nybble of r5 to r4 topmost nybble
|
| 1595 |
|
|
shrui r4,r4,#4
|
| 1596 |
|
|
or r4,r4,r7
|
| 1597 |
|
|
shrui r5,r5,#4
|
| 1598 |
|
|
or r5,r5,r3 ; copy new bcd digit into uppermost bits of r5
|
| 1599 |
|
|
divui r1,r1,r2 ; r1=r1/10
|
| 1600 |
|
|
loop r8,bta1
|
| 1601 |
|
|
shrui r4,r4,#48 ; right align number in register
|
| 1602 |
|
|
shli r6,r5,#16
|
| 1603 |
|
|
or r4,r4,r6 ; copy bits into r4
|
| 1604 |
|
|
shrui r5,r5,#48
|
| 1605 |
43 |
robfinch |
mov r1,r4
|
| 1606 |
|
|
mov r2,r5
|
| 1607 |
|
|
lw r3,[sp]
|
| 1608 |
|
|
lw r4,8[sp]
|
| 1609 |
|
|
lw r5,16[sp]
|
| 1610 |
|
|
lw r6,24[sp]
|
| 1611 |
|
|
lw r7,32[sp]
|
| 1612 |
|
|
lw r8,40[sp]
|
| 1613 |
27 |
robfinch |
ret #48
|
| 1614 |
|
|
|
| 1615 |
|
|
;------------------------------------------------------------------------------
|
| 1616 |
|
|
; Converts BCD number in r1 into Ascii number in r2 and r1.
|
| 1617 |
|
|
;------------------------------------------------------------------------------
|
| 1618 |
|
|
;
|
| 1619 |
|
|
BCDToAscii:
|
| 1620 |
|
|
subui sp,sp,#32
|
| 1621 |
43 |
robfinch |
sw r3,[sp]
|
| 1622 |
|
|
sw r4,8[sp]
|
| 1623 |
|
|
sw r5,16[sp]
|
| 1624 |
|
|
sw r8,24[sp]
|
| 1625 |
27 |
robfinch |
setlo r8,#15
|
| 1626 |
|
|
bta2:
|
| 1627 |
|
|
andi r2,r1,#0x0F
|
| 1628 |
|
|
ori r2,r2,#0x30
|
| 1629 |
|
|
shli r2,r2,#56
|
| 1630 |
|
|
shrui r4,r4,#8
|
| 1631 |
|
|
shli r5,r3,#56
|
| 1632 |
|
|
or r4,r4,r5
|
| 1633 |
|
|
shrui r3,r3,#8
|
| 1634 |
|
|
or r3,r3,r2
|
| 1635 |
|
|
shrui r1,r1,#4
|
| 1636 |
|
|
loop r8,bta2
|
| 1637 |
43 |
robfinch |
mov r1,r4
|
| 1638 |
|
|
mov r2,r3
|
| 1639 |
|
|
lw r3,[sp]
|
| 1640 |
|
|
lw r4,8[sp]
|
| 1641 |
|
|
lw r5,16[sp]
|
| 1642 |
|
|
lw r8,24[sp]
|
| 1643 |
27 |
robfinch |
ret #32
|
| 1644 |
|
|
|
| 1645 |
|
|
;------------------------------------------------------------------------------
|
| 1646 |
|
|
; Convert a binary number into a 20 character ascii string.
|
| 1647 |
|
|
; r1 = number to convert
|
| 1648 |
|
|
; r2 = address of string buffer
|
| 1649 |
|
|
;------------------------------------------------------------------------------
|
| 1650 |
|
|
;
|
| 1651 |
|
|
BinToStr:
|
| 1652 |
|
|
subui sp,sp,#56
|
| 1653 |
43 |
robfinch |
sw r3,[sp]
|
| 1654 |
|
|
sw r7,8[sp]
|
| 1655 |
|
|
sw r8,16[sp]
|
| 1656 |
|
|
sw r9,24[sp]
|
| 1657 |
|
|
sw r10,32[sp]
|
| 1658 |
|
|
sw r11,40[sp]
|
| 1659 |
|
|
sw lr,48[sp]
|
| 1660 |
|
|
mov r11,r2
|
| 1661 |
27 |
robfinch |
call BinToBCD
|
| 1662 |
43 |
robfinch |
mov r10,r2 ; save off r2
|
| 1663 |
27 |
robfinch |
call BCDToAscii
|
| 1664 |
|
|
setlo r9,#1
|
| 1665 |
|
|
btos3:
|
| 1666 |
|
|
setlo r8,#7
|
| 1667 |
|
|
btos1:
|
| 1668 |
|
|
shli r7,r9,#3
|
| 1669 |
|
|
addui r7,r7,r8
|
| 1670 |
|
|
addui r7,r7,#4
|
| 1671 |
|
|
andi r3,r1,#0xff
|
| 1672 |
|
|
sb r3,[r7+r11]
|
| 1673 |
|
|
shrui r1,r1,#8
|
| 1674 |
|
|
loop r8,btos1
|
| 1675 |
43 |
robfinch |
mov r1,r2
|
| 1676 |
27 |
robfinch |
loop r9,btos3
|
| 1677 |
|
|
; the last four digits
|
| 1678 |
43 |
robfinch |
mov r1,r10 ; get back r2
|
| 1679 |
27 |
robfinch |
call BCDToAscii
|
| 1680 |
|
|
setlo r8,#3
|
| 1681 |
|
|
btos2:
|
| 1682 |
|
|
andi r3,r1,#0xff
|
| 1683 |
|
|
sb r3,[r8+r11]
|
| 1684 |
|
|
shrui r1,r1,#8
|
| 1685 |
|
|
loop r8,btos2
|
| 1686 |
|
|
sb r0,20[r11] ; null terminate
|
| 1687 |
43 |
robfinch |
lw r3,[sp]
|
| 1688 |
|
|
lw r7,8[sp]
|
| 1689 |
|
|
lw r8,16[sp]
|
| 1690 |
|
|
lw r9,24[sp]
|
| 1691 |
|
|
lw r10,32[sp]
|
| 1692 |
|
|
lw r11,40[sp]
|
| 1693 |
|
|
lw lr,48[sp]
|
| 1694 |
27 |
robfinch |
ret #56
|
| 1695 |
|
|
|
| 1696 |
|
|
|
| 1697 |
|
|
;==============================================================================
|
| 1698 |
|
|
;==============================================================================
|
| 1699 |
|
|
Monitor:
|
| 1700 |
43 |
robfinch |
lea sp,STACKTOP0 ; top of stack; reset the stack pointer
|
| 1701 |
27 |
robfinch |
sb r0,KeybdEcho ; turn off keyboard echo
|
| 1702 |
|
|
PromptLn:
|
| 1703 |
|
|
call CRLF
|
| 1704 |
|
|
setlo r1,#'$'
|
| 1705 |
|
|
call DisplayChar
|
| 1706 |
|
|
|
| 1707 |
|
|
; Get characters until a CR is keyed
|
| 1708 |
|
|
;
|
| 1709 |
|
|
Prompt3:
|
| 1710 |
|
|
call KeybdGetChar
|
| 1711 |
|
|
beqi r1,#-1,Prompt3 ; wait for a character
|
| 1712 |
|
|
beqi r1,#CR,Prompt1
|
| 1713 |
|
|
call DisplayChar
|
| 1714 |
|
|
bra Prompt3
|
| 1715 |
|
|
|
| 1716 |
|
|
; Process the screen line that the CR was keyed on
|
| 1717 |
|
|
;
|
| 1718 |
|
|
Prompt1:
|
| 1719 |
|
|
sc r0,CursorCol ; go back to the start of the line
|
| 1720 |
|
|
call CalcScreenLoc ; r1 = screen memory location
|
| 1721 |
|
|
or r3,r1,r0
|
| 1722 |
43 |
robfinch |
inch r1,[r3]
|
| 1723 |
27 |
robfinch |
addui r3,r3,#2
|
| 1724 |
|
|
call ScreenToAscii
|
| 1725 |
|
|
bnei r1,#'$',Prompt2 ; skip over '$' prompt character
|
| 1726 |
43 |
robfinch |
inch r1,[r3]
|
| 1727 |
27 |
robfinch |
addui r3,r3,#2
|
| 1728 |
|
|
call ScreenToAscii
|
| 1729 |
|
|
|
| 1730 |
|
|
; Dispatch based on command character
|
| 1731 |
|
|
;
|
| 1732 |
|
|
Prompt2:
|
| 1733 |
|
|
beqi r1,#':',Editmem ; $: - edit memory
|
| 1734 |
|
|
beqi r1,#'D',Dumpmem ; $D - dump memory
|
| 1735 |
43 |
robfinch |
beqi r1,#'B',CSTART ; $B - start tiny basic
|
| 1736 |
27 |
robfinch |
beqi r1,#'J',ExecuteCode ; $J - execute code
|
| 1737 |
|
|
beqi r1,#'L',LoadS19 ; $L - load S19 file
|
| 1738 |
|
|
beqi r1,#'?',DisplayHelp ; $? - display help
|
| 1739 |
|
|
beqi r1,#'C',TestCLS ; $C - clear screen
|
| 1740 |
43 |
robfinch |
beqi r1,#'R',RandomLinesCall
|
| 1741 |
|
|
beqi r1,#'I',Invaders
|
| 1742 |
|
|
beqi r1,#'P',Piano
|
| 1743 |
27 |
robfinch |
bra Monitor
|
| 1744 |
|
|
|
| 1745 |
43 |
robfinch |
RandomLinesCall:
|
| 1746 |
|
|
call RandomLines
|
| 1747 |
|
|
bra Monitor
|
| 1748 |
|
|
|
| 1749 |
27 |
robfinch |
TestCLS:
|
| 1750 |
43 |
robfinch |
inch r1,[r3]
|
| 1751 |
27 |
robfinch |
addui r3,r3,#2
|
| 1752 |
|
|
call ScreenToAscii
|
| 1753 |
|
|
bnei r1,#'L',Monitor
|
| 1754 |
43 |
robfinch |
inch r1,[r3]
|
| 1755 |
27 |
robfinch |
addui r3,r3,#2
|
| 1756 |
|
|
call ScreenToAscii
|
| 1757 |
|
|
bnei r1,#'S',Monitor
|
| 1758 |
|
|
call ClearScreen
|
| 1759 |
|
|
sb r0,CursorCol
|
| 1760 |
|
|
sb r0,CursorRow
|
| 1761 |
|
|
call CalcScreenLoc
|
| 1762 |
|
|
bra Monitor
|
| 1763 |
10 |
robfinch |
|
| 1764 |
27 |
robfinch |
DisplayHelp:
|
| 1765 |
|
|
setlo r1,HelpMsg
|
| 1766 |
|
|
call DisplayString
|
| 1767 |
|
|
bra Monitor
|
| 1768 |
|
|
|
| 1769 |
|
|
align 16
|
| 1770 |
|
|
HelpMsg:
|
| 1771 |
|
|
db "? = Display help",CR,LF
|
| 1772 |
|
|
db "CLS = clear screen",CR,LF
|
| 1773 |
|
|
db ": = Edit memory bytes",CR,LF
|
| 1774 |
|
|
db "L = Load S19 file",CR,LF
|
| 1775 |
|
|
db "D = Dump memory",CR,LF
|
| 1776 |
|
|
db "B = start tiny basic",CR,LF
|
| 1777 |
43 |
robfinch |
db "J = Jump to code",CR,LF
|
| 1778 |
|
|
db "I = Invaders",CR,LF
|
| 1779 |
|
|
db "R = Random lines",CR,LF
|
| 1780 |
|
|
db "P = Piano",CR,LF,0
|
| 1781 |
27 |
robfinch |
align 16
|
| 1782 |
|
|
|
| 1783 |
|
|
;------------------------------------------------------------------------------
|
| 1784 |
|
|
; Ignore blanks in the input
|
| 1785 |
|
|
; r3 = text pointer
|
| 1786 |
|
|
; r1 destroyed
|
| 1787 |
|
|
;------------------------------------------------------------------------------
|
| 1788 |
|
|
;
|
| 1789 |
|
|
ignBlanks:
|
| 1790 |
|
|
subui sp,sp,#8
|
| 1791 |
|
|
sw r31,[sp]
|
| 1792 |
|
|
ignBlanks1:
|
| 1793 |
43 |
robfinch |
inch r1,[r3]
|
| 1794 |
27 |
robfinch |
addui r3,r3,#2
|
| 1795 |
|
|
call ScreenToAscii
|
| 1796 |
|
|
beqi r1,#' ',ignBlanks1
|
| 1797 |
|
|
subui r3,r3,#2
|
| 1798 |
|
|
lw r31,[sp]
|
| 1799 |
|
|
ret #8
|
| 1800 |
|
|
|
| 1801 |
|
|
;------------------------------------------------------------------------------
|
| 1802 |
|
|
; Edit memory byte(s).
|
| 1803 |
|
|
;------------------------------------------------------------------------------
|
| 1804 |
|
|
;
|
| 1805 |
|
|
EditMem:
|
| 1806 |
|
|
call ignBlanks
|
| 1807 |
|
|
call GetHexNumber
|
| 1808 |
|
|
or r5,r1,r0
|
| 1809 |
|
|
setlo r4,#7
|
| 1810 |
|
|
edtmem1:
|
| 1811 |
|
|
call ignBlanks
|
| 1812 |
|
|
call GetHexNumber
|
| 1813 |
|
|
sb r1,[r5]
|
| 1814 |
|
|
addui r5,r5,#1
|
| 1815 |
|
|
loop r4,edtmem1
|
| 1816 |
|
|
bra Monitor
|
| 1817 |
|
|
|
| 1818 |
|
|
;------------------------------------------------------------------------------
|
| 1819 |
|
|
; Execute code at the specified address.
|
| 1820 |
|
|
;------------------------------------------------------------------------------
|
| 1821 |
|
|
;
|
| 1822 |
|
|
ExecuteCode:
|
| 1823 |
|
|
call ignBlanks
|
| 1824 |
|
|
call GetHexNumber
|
| 1825 |
43 |
robfinch |
jal r31,[r1]
|
| 1826 |
27 |
robfinch |
bra Monitor
|
| 1827 |
|
|
|
| 1828 |
|
|
;------------------------------------------------------------------------------
|
| 1829 |
|
|
; Do a memory dump of the requested location.
|
| 1830 |
|
|
;------------------------------------------------------------------------------
|
| 1831 |
|
|
;
|
| 1832 |
|
|
DumpMem:
|
| 1833 |
|
|
call ignBlanks
|
| 1834 |
|
|
call GetHexNumber
|
| 1835 |
43 |
robfinch |
mov r2,r1
|
| 1836 |
27 |
robfinch |
call CRLF
|
| 1837 |
|
|
call DisplayMem
|
| 1838 |
|
|
call DisplayMem
|
| 1839 |
|
|
call DisplayMem
|
| 1840 |
|
|
call DisplayMem
|
| 1841 |
|
|
call DisplayMem
|
| 1842 |
|
|
call DisplayMem
|
| 1843 |
|
|
call DisplayMem
|
| 1844 |
|
|
call DisplayMem
|
| 1845 |
|
|
bra Monitor
|
| 1846 |
|
|
|
| 1847 |
|
|
;------------------------------------------------------------------------------
|
| 1848 |
|
|
; Get a hexidecimal number. Maximum of sixteen digits.
|
| 1849 |
|
|
; R3 = text pointer (updated)
|
| 1850 |
43 |
robfinch |
; R1 = hex number
|
| 1851 |
27 |
robfinch |
;------------------------------------------------------------------------------
|
| 1852 |
|
|
;
|
| 1853 |
|
|
GetHexNumber:
|
| 1854 |
|
|
subui sp,sp,#24
|
| 1855 |
43 |
robfinch |
sw r2,[sp]
|
| 1856 |
|
|
sw r4,8[sp]
|
| 1857 |
|
|
sw lr,16[sp]
|
| 1858 |
27 |
robfinch |
setlo r2,#0
|
| 1859 |
|
|
setlo r4,#15
|
| 1860 |
|
|
gthxn2:
|
| 1861 |
43 |
robfinch |
inch r1,[r3]
|
| 1862 |
27 |
robfinch |
addui r3,r3,#2
|
| 1863 |
|
|
call ScreenToAscii
|
| 1864 |
|
|
call AsciiToHexNybble
|
| 1865 |
|
|
beqi r1,#-1,gthxn1
|
| 1866 |
|
|
shli r2,r2,#4
|
| 1867 |
|
|
andi r1,r1,#0x0f
|
| 1868 |
|
|
or r2,r2,r1
|
| 1869 |
|
|
loop r4,gthxn2
|
| 1870 |
|
|
gthxn1:
|
| 1871 |
43 |
robfinch |
mov r1,r2
|
| 1872 |
|
|
lw lr,16[sp]
|
| 1873 |
|
|
lw r4,8[sp]
|
| 1874 |
|
|
lw r2,[sp]
|
| 1875 |
27 |
robfinch |
ret #24
|
| 1876 |
|
|
|
| 1877 |
|
|
;------------------------------------------------------------------------------
|
| 1878 |
|
|
; Convert ASCII character in the range '0' to '9', 'a' to 'f' or 'A' to 'F'
|
| 1879 |
|
|
; to a hex nybble.
|
| 1880 |
|
|
;------------------------------------------------------------------------------
|
| 1881 |
|
|
;
|
| 1882 |
|
|
AsciiToHexNybble:
|
| 1883 |
|
|
bltui r1,#'0',gthx3
|
| 1884 |
|
|
bgtui r1,#'9',gthx5
|
| 1885 |
|
|
subui r1,r1,#'0'
|
| 1886 |
10 |
robfinch |
ret
|
| 1887 |
27 |
robfinch |
gthx5:
|
| 1888 |
|
|
bltui r1,#'A',gthx3
|
| 1889 |
|
|
bgtui r1,#'F',gthx6
|
| 1890 |
|
|
subui r1,r1,#'A'
|
| 1891 |
|
|
addui r1,r1,#10
|
| 1892 |
|
|
ret
|
| 1893 |
|
|
gthx6:
|
| 1894 |
|
|
bltui r1,#'a',gthx3
|
| 1895 |
|
|
bgtui r1,#'f',gthx3
|
| 1896 |
|
|
subui r1,r1,#'a'
|
| 1897 |
|
|
addui r1,r1,#10
|
| 1898 |
|
|
ret
|
| 1899 |
|
|
gthx3:
|
| 1900 |
|
|
setlo r1,#-1 ; not a hex number
|
| 1901 |
|
|
ret
|
| 1902 |
10 |
robfinch |
|
| 1903 |
|
|
;==============================================================================
|
| 1904 |
27 |
robfinch |
; Load an S19 format file
|
| 1905 |
|
|
;==============================================================================
|
| 1906 |
|
|
;
|
| 1907 |
|
|
LoadS19:
|
| 1908 |
|
|
bra ProcessRec
|
| 1909 |
|
|
NextRec:
|
| 1910 |
|
|
call sGetChar
|
| 1911 |
|
|
bne r1,#LF,NextRec
|
| 1912 |
|
|
ProcessRec:
|
| 1913 |
|
|
call sGetChar
|
| 1914 |
|
|
beqi r1,#26,Monitor ; CTRL-Z ?
|
| 1915 |
|
|
bnei r1,#'S',NextRec
|
| 1916 |
|
|
call sGetChar
|
| 1917 |
|
|
blt r1,#'0',NextRec
|
| 1918 |
|
|
bgt r1,#'9',NextRec
|
| 1919 |
|
|
or r4,r1,r0 ; r4 = record type
|
| 1920 |
|
|
call sGetChar
|
| 1921 |
|
|
call AsciiToHexNybble
|
| 1922 |
|
|
or r2,r1,r0
|
| 1923 |
|
|
call sGetChar
|
| 1924 |
|
|
call AsciiToHexNybble
|
| 1925 |
|
|
shli r2,r2,#4
|
| 1926 |
|
|
or r2,r2,r1 ; r2 = byte count
|
| 1927 |
|
|
or r3,r2,r1 ; r3 = byte count
|
| 1928 |
|
|
beqi r4,#'0',NextRec ; manufacturer ID record, ignore
|
| 1929 |
|
|
beqi r4,#'1',ProcessS1
|
| 1930 |
|
|
beqi r4,#'2',ProcessS2
|
| 1931 |
|
|
beqi r4,#'3',ProcessS3
|
| 1932 |
|
|
beqi r4,#'5',NextRec ; record count record, ignore
|
| 1933 |
|
|
beqi r4,#'7',ProcessS7
|
| 1934 |
|
|
beqi r4,#'8',ProcessS8
|
| 1935 |
|
|
beqi r4,#'9',ProcessS9
|
| 1936 |
|
|
bra NextRec
|
| 1937 |
|
|
|
| 1938 |
|
|
pcssxa:
|
| 1939 |
|
|
andi r3,r3,#0xff
|
| 1940 |
|
|
subui r3,r3,#1 ; one less for loop
|
| 1941 |
|
|
pcss1a:
|
| 1942 |
|
|
call sGetChar
|
| 1943 |
|
|
call AsciiToHexNybble
|
| 1944 |
|
|
shli r2,r2,#4
|
| 1945 |
|
|
or r2,r2,r1
|
| 1946 |
|
|
call sGetChar
|
| 1947 |
|
|
call AsciiToHexNybble
|
| 1948 |
|
|
shli r2,r2,#4
|
| 1949 |
|
|
or r2,r2,r1
|
| 1950 |
|
|
sb r2,[r5]
|
| 1951 |
|
|
addui r5,r5,#1
|
| 1952 |
|
|
loop r3,pcss1a
|
| 1953 |
|
|
; Get the checksum byte
|
| 1954 |
|
|
call sGetChar
|
| 1955 |
|
|
call AsciiToHexNybble
|
| 1956 |
|
|
shli r2,r2,#4
|
| 1957 |
|
|
or r2,r2,r1
|
| 1958 |
|
|
call sGetChar
|
| 1959 |
|
|
call AsciiToHexNybble
|
| 1960 |
|
|
shli r2,r2,#4
|
| 1961 |
|
|
or r2,r2,r1
|
| 1962 |
|
|
bra NextRec
|
| 1963 |
|
|
|
| 1964 |
|
|
ProcessS1:
|
| 1965 |
|
|
call S19Get16BitAddress
|
| 1966 |
|
|
bra pcssxa
|
| 1967 |
|
|
ProcessS2:
|
| 1968 |
|
|
call S19Get24BitAddress
|
| 1969 |
|
|
bra pcssxa
|
| 1970 |
|
|
ProcessS3:
|
| 1971 |
|
|
call S19Get32BitAddress
|
| 1972 |
|
|
bra pcssxa
|
| 1973 |
|
|
ProcessS7:
|
| 1974 |
|
|
call S19Get32BitAddress
|
| 1975 |
|
|
sw r5,S19StartAddress
|
| 1976 |
|
|
bra Monitor
|
| 1977 |
|
|
ProcessS8:
|
| 1978 |
|
|
call S19Get24BitAddress
|
| 1979 |
|
|
sw r5,S19StartAddress
|
| 1980 |
|
|
bra Monitor
|
| 1981 |
|
|
ProcessS9:
|
| 1982 |
|
|
call S19Get16BitAddress
|
| 1983 |
|
|
sw r5,S19StartAddress
|
| 1984 |
|
|
bra Monitor
|
| 1985 |
|
|
|
| 1986 |
|
|
S19Get16BitAddress:
|
| 1987 |
|
|
subui sp,sp,#8
|
| 1988 |
|
|
sw r31,[sp]
|
| 1989 |
|
|
call sGetChar
|
| 1990 |
|
|
call AsciiToHexNybble
|
| 1991 |
|
|
or r2,r1,r0
|
| 1992 |
|
|
bra S1932b
|
| 1993 |
|
|
|
| 1994 |
|
|
S19Get24BitAddress:
|
| 1995 |
|
|
subui sp,sp,#8
|
| 1996 |
|
|
sw r31,[sp]
|
| 1997 |
|
|
call sGetChar
|
| 1998 |
|
|
call AsciiToHexNybble
|
| 1999 |
|
|
or r2,r1,r0
|
| 2000 |
|
|
bra S1932a
|
| 2001 |
|
|
|
| 2002 |
|
|
S19Get32BitAddress:
|
| 2003 |
|
|
subui sp,sp,#8
|
| 2004 |
|
|
sw r31,[sp]
|
| 2005 |
|
|
call sGetChar
|
| 2006 |
|
|
call AsciiToHexNybble
|
| 2007 |
|
|
or r2,r1,r0
|
| 2008 |
|
|
call sGetChar
|
| 2009 |
|
|
call AsciiToHexNybble
|
| 2010 |
|
|
shli r2,r2,#4
|
| 2011 |
|
|
or r2,r1,r2
|
| 2012 |
|
|
call sGetChar
|
| 2013 |
|
|
call AsciiToHexNybble
|
| 2014 |
|
|
shli r2,r2,#4
|
| 2015 |
|
|
or r2,r2,r1
|
| 2016 |
|
|
S1932a:
|
| 2017 |
|
|
call sGetChar
|
| 2018 |
|
|
call AsciiToHexNybble
|
| 2019 |
|
|
shli r2,r2,#4
|
| 2020 |
|
|
or r2,r2,r1
|
| 2021 |
|
|
call sGetChar
|
| 2022 |
|
|
call AsciiToHexNybble
|
| 2023 |
|
|
shli r2,r2,#4
|
| 2024 |
|
|
or r2,r2,r1
|
| 2025 |
|
|
S1932b:
|
| 2026 |
|
|
call sGetChar
|
| 2027 |
|
|
call AsciiToHexNybble
|
| 2028 |
|
|
shli r2,r2,#4
|
| 2029 |
|
|
or r2,r2,r1
|
| 2030 |
|
|
call sGetChar
|
| 2031 |
|
|
call AsciiToHexNybble
|
| 2032 |
|
|
shli r2,r2,#4
|
| 2033 |
|
|
or r2,r2,r1
|
| 2034 |
|
|
call sGetChar
|
| 2035 |
|
|
call AsciiToHexNybble
|
| 2036 |
|
|
shli r2,r2,#4
|
| 2037 |
|
|
or r2,r2,r1
|
| 2038 |
|
|
xor r4,r4,r4
|
| 2039 |
|
|
or r5,r2,r0
|
| 2040 |
|
|
lw r31,[sp]
|
| 2041 |
|
|
addui sp,sp,#8
|
| 2042 |
|
|
ret
|
| 2043 |
|
|
|
| 2044 |
|
|
;------------------------------------------------------------------------------
|
| 2045 |
|
|
; Get a character from auxillary input, checking the keyboard status for a
|
| 2046 |
|
|
; CTRL-C
|
| 2047 |
|
|
;------------------------------------------------------------------------------
|
| 2048 |
|
|
;
|
| 2049 |
|
|
sGetChar:
|
| 2050 |
|
|
subui sp,sp,#8
|
| 2051 |
|
|
sw r31,[sp]
|
| 2052 |
|
|
sgc2:
|
| 2053 |
|
|
call KeybdCheckForKey
|
| 2054 |
|
|
beq r1,r0,sgc1
|
| 2055 |
|
|
call KeybdGetchar
|
| 2056 |
|
|
beqi r1,#CRTLC,Monitor
|
| 2057 |
|
|
sgc1:
|
| 2058 |
|
|
call AUXIN
|
| 2059 |
43 |
robfinch |
ble r1,r0,sgc2
|
| 2060 |
27 |
robfinch |
lw r31,[sp]
|
| 2061 |
43 |
robfinch |
ret #8
|
| 2062 |
27 |
robfinch |
|
| 2063 |
|
|
;--------------------------------------------------------------------------
|
| 2064 |
43 |
robfinch |
; Draw random lines on the bitmap screen.
|
| 2065 |
27 |
robfinch |
;--------------------------------------------------------------------------
|
| 2066 |
43 |
robfinch |
RandomLines:
|
| 2067 |
|
|
subui sp,sp,#24
|
| 2068 |
|
|
sw r1,[sp]
|
| 2069 |
|
|
sw r3,8[sp]
|
| 2070 |
|
|
sw lr,16[sp]
|
| 2071 |
|
|
rl5:
|
| 2072 |
|
|
gran
|
| 2073 |
|
|
mfspr r1,rand ; select a random color
|
| 2074 |
|
|
outh r1,GACCEL
|
| 2075 |
|
|
rl1: ; random X0
|
| 2076 |
|
|
gran
|
| 2077 |
|
|
mfspr r1,rand
|
| 2078 |
|
|
lw r3,#1364
|
| 2079 |
|
|
mod r1,r1,r3
|
| 2080 |
|
|
outh r1,GACCEL+8
|
| 2081 |
|
|
rl2: ; random X1
|
| 2082 |
|
|
gran
|
| 2083 |
|
|
mfspr r1,rand
|
| 2084 |
|
|
lw r3,#1364
|
| 2085 |
|
|
mod r1,r1,r3
|
| 2086 |
|
|
outh r1,GACCEL+16
|
| 2087 |
|
|
rl3: ; random Y0
|
| 2088 |
|
|
gran
|
| 2089 |
|
|
mfspr r1,rand
|
| 2090 |
|
|
lw r3,#768
|
| 2091 |
|
|
mod r1,r1,r3
|
| 2092 |
|
|
outh r1,GACCEL+12
|
| 2093 |
|
|
rl4: ; random Y1
|
| 2094 |
|
|
gran
|
| 2095 |
|
|
mfspr r1,rand
|
| 2096 |
|
|
lw r3,#768
|
| 2097 |
|
|
mod r1,r1,r3
|
| 2098 |
|
|
outh r1,GACCEL+20
|
| 2099 |
|
|
setlo r1,#2 ; draw line command
|
| 2100 |
|
|
outh r1,GACCEL+60
|
| 2101 |
|
|
rl8:
|
| 2102 |
|
|
call KeybdGetChar
|
| 2103 |
|
|
beqi r1,#CTRLC,rl7
|
| 2104 |
|
|
beqi r1,#'r',rl5
|
| 2105 |
|
|
bra rl8
|
| 2106 |
|
|
rl7:
|
| 2107 |
|
|
lw lr,16[sp]
|
| 2108 |
|
|
lw r3,8[sp]
|
| 2109 |
|
|
lw r1,[sp]
|
| 2110 |
|
|
ret #24
|
| 2111 |
|
|
|
| 2112 |
|
|
;--------------------------------------------------------------------------
|
| 2113 |
|
|
; Initialize sprite image caches with random data.
|
| 2114 |
|
|
;--------------------------------------------------------------------------
|
| 2115 |
|
|
RandomizeSprram:
|
| 2116 |
|
|
lea r2,SPRRAM
|
| 2117 |
|
|
setlo r4,#14335 ; number of chars to initialize
|
| 2118 |
|
|
rsr1:
|
| 2119 |
|
|
gran
|
| 2120 |
|
|
mfspr r1,rand
|
| 2121 |
|
|
outc r1,[r2]
|
| 2122 |
|
|
addui r2,r2,#2
|
| 2123 |
|
|
loop r4,rsr1
|
| 2124 |
|
|
ret
|
| 2125 |
|
|
|
| 2126 |
|
|
;--------------------------------------------------------------------------
|
| 2127 |
|
|
; Setup the AC97/LM4550 audio controller. Check keyboard for a CTRL-C
|
| 2128 |
|
|
; interrupt which may be necessary if the audio controller isn't
|
| 2129 |
|
|
; responding.
|
| 2130 |
|
|
;--------------------------------------------------------------------------
|
| 2131 |
27 |
robfinch |
;
|
| 2132 |
|
|
SetupAC97:
|
| 2133 |
43 |
robfinch |
subui sp,sp,#16
|
| 2134 |
|
|
sw r1,[sp]
|
| 2135 |
|
|
sw lr,8[sp]
|
| 2136 |
|
|
sac974:
|
| 2137 |
|
|
outc r0,AC97+0x26 ; trigger a read of register 26 (status reg)
|
| 2138 |
27 |
robfinch |
sac971: ; wait for status to register 0xF (all ready)
|
| 2139 |
43 |
robfinch |
call KeybdGetChar ; see if we needed to CTRL-C
|
| 2140 |
|
|
beqi r1,#CTRLC,sac973
|
| 2141 |
|
|
outc r1,AC97+0x68 ; wait for dirty bit to clear
|
| 2142 |
|
|
bne r1,r0,sac971
|
| 2143 |
|
|
outc r1,AC97+0x26 ; check status at reg h26, wait for
|
| 2144 |
|
|
andi r1,r1,#0x0F ; analogue to be ready
|
| 2145 |
|
|
bnei r1,#0x0F,sac974
|
| 2146 |
|
|
sac973:
|
| 2147 |
|
|
outc r0,AC97+2 ; master volume, 0db attenuation, mute off
|
| 2148 |
|
|
outc r0,AC97+4 ; headphone volume, 0db attenuation, mute off
|
| 2149 |
|
|
outc r0,AC97+0x18 ; PCM gain (mixer) mute off, no attenuation
|
| 2150 |
|
|
outc r0,AC97+0x0A ; mute PC beep
|
| 2151 |
|
|
setlo r1,#0x8000 ; bypass 3D sound
|
| 2152 |
|
|
outc r1,AC97+0x20
|
| 2153 |
|
|
sac972:
|
| 2154 |
|
|
call KeybdGetChar
|
| 2155 |
|
|
beqi r1,#CTRLC,sac975
|
| 2156 |
|
|
outc r1,AC97+0x68 ; wait for dirty bits to clear
|
| 2157 |
|
|
bne r1,r0,sac972 ; wait a while for the settings to take effect
|
| 2158 |
|
|
sac975:
|
| 2159 |
|
|
lw lr,8[sp]
|
| 2160 |
|
|
lw r1,[sp]
|
| 2161 |
|
|
ret #16
|
| 2162 |
27 |
robfinch |
|
| 2163 |
43 |
robfinch |
;--------------------------------------------------------------------------
|
| 2164 |
|
|
; Sound a 800 Hz beep
|
| 2165 |
|
|
;--------------------------------------------------------------------------
|
| 2166 |
|
|
;
|
| 2167 |
27 |
robfinch |
Beep:
|
| 2168 |
43 |
robfinch |
subui sp,sp,#16
|
| 2169 |
|
|
sw r1,[sp]
|
| 2170 |
|
|
sw lr,8[sp]
|
| 2171 |
|
|
setlo r1,#8
|
| 2172 |
|
|
outb r1,LED
|
| 2173 |
27 |
robfinch |
ori r1,r0,#15 ; master volume to max
|
| 2174 |
43 |
robfinch |
outc r1,PSG+128
|
| 2175 |
27 |
robfinch |
ori r1,r0,#13422 ; 800Hz
|
| 2176 |
43 |
robfinch |
outc r1,PSGFREQ0
|
| 2177 |
|
|
setlo r1,#9
|
| 2178 |
|
|
outb r1,LED
|
| 2179 |
|
|
; decay (16.384 ms)2
|
| 2180 |
|
|
; attack (8.192 ms)1
|
| 2181 |
|
|
; release (1.024 s)A
|
| 2182 |
|
|
; sustain level C
|
| 2183 |
|
|
setlo r1,#0xCA12
|
| 2184 |
|
|
outc r1,PSGADSR0
|
| 2185 |
27 |
robfinch |
ori r1,r0,#0x1104 ; gate, output enable, triangle waveform
|
| 2186 |
43 |
robfinch |
outc r1,PSGCTRL0
|
| 2187 |
27 |
robfinch |
ori r1,r0,#25000000 ; delay about 1s
|
| 2188 |
|
|
beep1:
|
| 2189 |
|
|
loop r1,beep1
|
| 2190 |
43 |
robfinch |
setlo r1,#13
|
| 2191 |
|
|
outb r1,LED
|
| 2192 |
|
|
ori r1,r0,#0x0104 ; gate off, output enable, triangle waveform
|
| 2193 |
|
|
outc r1,PSGCTRL0
|
| 2194 |
|
|
ori r1,r0,#25000000 ; delay about 1s
|
| 2195 |
|
|
beep2:
|
| 2196 |
|
|
loop r1,beep2
|
| 2197 |
|
|
setlo r1,#16
|
| 2198 |
|
|
outb r1,LED
|
| 2199 |
27 |
robfinch |
ori r1,r0,#0x0000 ; gate off, output enable off, no waveform
|
| 2200 |
43 |
robfinch |
outc r1,PSGCTRL0
|
| 2201 |
|
|
lw lr,8[sp]
|
| 2202 |
|
|
lw r1,[sp]
|
| 2203 |
|
|
ret #16
|
| 2204 |
|
|
|
| 2205 |
|
|
;--------------------------------------------------------------------------
|
| 2206 |
|
|
;--------------------------------------------------------------------------
|
| 2207 |
|
|
;
|
| 2208 |
|
|
Piano:
|
| 2209 |
|
|
ori r1,r0,#15 ; master volume to max
|
| 2210 |
|
|
outc r1,PSG+128
|
| 2211 |
|
|
playnt:
|
| 2212 |
|
|
call KeybdGetChar
|
| 2213 |
|
|
beqi r1,#CTRLC,Monitor
|
| 2214 |
|
|
beqi r1,#'a',playnt1a
|
| 2215 |
|
|
beqi r1,#'b',playnt1b
|
| 2216 |
|
|
beqi r1,#'c',playnt1c
|
| 2217 |
|
|
beqi r1,#'d',playnt1d
|
| 2218 |
|
|
beqi r1,#'e',playnt1e
|
| 2219 |
|
|
beqi r1,#'f',playnt1f
|
| 2220 |
|
|
beqi r1,#'g',playnt1g
|
| 2221 |
|
|
bra playnt
|
| 2222 |
|
|
|
| 2223 |
|
|
playnt1a:
|
| 2224 |
|
|
setlo r1,#7217
|
| 2225 |
|
|
call Tone
|
| 2226 |
|
|
bra playnt
|
| 2227 |
|
|
playnt1b:
|
| 2228 |
|
|
setlo r1,#8101
|
| 2229 |
|
|
call Tone
|
| 2230 |
|
|
bra playnt
|
| 2231 |
|
|
playnt1c:
|
| 2232 |
|
|
setlo r1,#4291
|
| 2233 |
|
|
call Tone
|
| 2234 |
|
|
bra playnt
|
| 2235 |
|
|
playnt1d:
|
| 2236 |
|
|
setlo r1,#4817
|
| 2237 |
|
|
call Tone
|
| 2238 |
|
|
bra playnt
|
| 2239 |
|
|
playnt1e:
|
| 2240 |
|
|
setlo r1,#5407
|
| 2241 |
|
|
call Tone
|
| 2242 |
|
|
bra playnt
|
| 2243 |
|
|
playnt1f:
|
| 2244 |
|
|
setlo r1,#5728
|
| 2245 |
|
|
call Tone
|
| 2246 |
|
|
bra playnt
|
| 2247 |
|
|
playnt1g:
|
| 2248 |
|
|
setlo r1,#6430
|
| 2249 |
|
|
call Tone
|
| 2250 |
|
|
bra playnt
|
| 2251 |
|
|
|
| 2252 |
|
|
Tone:
|
| 2253 |
|
|
subui sp,sp,#16
|
| 2254 |
|
|
sw r1,[sp]
|
| 2255 |
|
|
sw lr,8[sp]
|
| 2256 |
|
|
outc r1,PSGFREQ0
|
| 2257 |
|
|
; decay (16.384 ms)2
|
| 2258 |
|
|
; attack (8.192 ms)1
|
| 2259 |
|
|
; release (1.024 s)A
|
| 2260 |
|
|
; sustain level C
|
| 2261 |
|
|
setlo r1,#0xCA12
|
| 2262 |
|
|
outc r1,PSGADSR0
|
| 2263 |
|
|
ori r1,r0,#0x1104 ; gate, output enable, triangle waveform
|
| 2264 |
|
|
outc r1,PSGCTRL0
|
| 2265 |
|
|
ori r1,r0,#250000 ; delay about 10ms
|
| 2266 |
|
|
tone1:
|
| 2267 |
|
|
loop r1,tone1
|
| 2268 |
|
|
ori r1,r0,#0x0104 ; gate off, output enable, triangle waveform
|
| 2269 |
|
|
outc r1,PSGCTRL0
|
| 2270 |
|
|
ori r1,r0,#250000 ; delay about 10ms
|
| 2271 |
|
|
tone2:
|
| 2272 |
|
|
loop r1,tone2
|
| 2273 |
|
|
ori r1,r0,#0x0000 ; gate off, output enable off, no waveform
|
| 2274 |
|
|
outc r1,PSGCTRL0
|
| 2275 |
|
|
lw lr,8[sp]
|
| 2276 |
|
|
lw r1,[sp]
|
| 2277 |
|
|
ret #16
|
| 2278 |
|
|
|
| 2279 |
|
|
;==============================================================================
|
| 2280 |
|
|
;==============================================================================
|
| 2281 |
|
|
SetupRasterIRQ:
|
| 2282 |
|
|
subui sp,sp,#8
|
| 2283 |
|
|
sw r1,[sp]
|
| 2284 |
|
|
setlo r1,#200
|
| 2285 |
|
|
outc r1,RASTERIRQ
|
| 2286 |
|
|
setlo r1,#240
|
| 2287 |
|
|
outc r1,RASTERIRQ+2
|
| 2288 |
|
|
setlo r1,#280
|
| 2289 |
|
|
outc r1,RASTERIRQ+4
|
| 2290 |
|
|
setlo r1,#320
|
| 2291 |
|
|
outc r1,RASTERIRQ+6
|
| 2292 |
|
|
setlo r1,#360
|
| 2293 |
|
|
outc r1,RASTERIRQ+8
|
| 2294 |
|
|
lw r1,[sp]
|
| 2295 |
|
|
ret #8
|
| 2296 |
|
|
|
| 2297 |
|
|
RasterIRQfn:
|
| 2298 |
|
|
inch r1,RASTERIRQ+30 ; get the raster compare register # (clears IRQ)
|
| 2299 |
|
|
beqi r1,#1,rirq1
|
| 2300 |
|
|
beqi r1,#2,rirq2
|
| 2301 |
|
|
beqi r1,#3,rirq3
|
| 2302 |
|
|
beqi r1,#4,rirq4
|
| 2303 |
|
|
beqi r1,#5,rirq5
|
| 2304 |
|
|
beqi r1,#6,rirq6
|
| 2305 |
|
|
beqi r1,#7,rirq7
|
| 2306 |
|
|
beqi r1,#8,rirq8
|
| 2307 |
27 |
robfinch |
ret
|
| 2308 |
43 |
robfinch |
rirq1:
|
| 2309 |
|
|
rirq2:
|
| 2310 |
|
|
rirq3:
|
| 2311 |
|
|
rirq4:
|
| 2312 |
|
|
rirq5:
|
| 2313 |
|
|
rirq6:
|
| 2314 |
|
|
rirq7:
|
| 2315 |
|
|
rirq8:
|
| 2316 |
|
|
mului r1,r1,#40
|
| 2317 |
|
|
addui r1,r1,#204
|
| 2318 |
|
|
outc r1,SPRITEREGS+2
|
| 2319 |
|
|
outc r1,SPRITEREGS+18
|
| 2320 |
|
|
outc r1,SPRITEREGS+34
|
| 2321 |
|
|
outc r1,SPRITEREGS+50
|
| 2322 |
|
|
outc r1,SPRITEREGS+66
|
| 2323 |
|
|
outc r1,SPRITEREGS+82
|
| 2324 |
|
|
outc r1,SPRITEREGS+98
|
| 2325 |
|
|
outc r1,SPRITEREGS+114
|
| 2326 |
|
|
ret
|
| 2327 |
27 |
robfinch |
|
| 2328 |
43 |
robfinch |
;------------------------------------------------------------------------------
|
| 2329 |
|
|
;------------------------------------------------------------------------------
|
| 2330 |
|
|
DisplayDatetime:
|
| 2331 |
|
|
subui sp,sp,#32
|
| 2332 |
|
|
sw r1,[sp]
|
| 2333 |
|
|
sw r2,8[sp]
|
| 2334 |
|
|
sw r3,16[sp]
|
| 2335 |
|
|
sw lr,24[sp]
|
| 2336 |
|
|
call CursorOff
|
| 2337 |
|
|
lc r2,CursorRow
|
| 2338 |
|
|
lc r3,CursorCol
|
| 2339 |
|
|
outw r0,DATETIME+24 ; trigger a snapshot
|
| 2340 |
|
|
lw r1,#46 ; move cursor down to last display line
|
| 2341 |
|
|
sc r1,CursorRow
|
| 2342 |
|
|
lw r1,#64
|
| 2343 |
|
|
sc r1,CursorCol
|
| 2344 |
|
|
inw r1,DATETIME ; get the snapshotted date and time
|
| 2345 |
|
|
call DisplayWord ; display on screen
|
| 2346 |
|
|
sc r2,CursorRow ; restore cursor position
|
| 2347 |
|
|
sc r3,CursorCol
|
| 2348 |
|
|
call CalcScreenLoc
|
| 2349 |
|
|
call CursorOn
|
| 2350 |
|
|
lw lr,24[sp]
|
| 2351 |
|
|
lw r3,16[sp]
|
| 2352 |
|
|
lw r2,8[sp]
|
| 2353 |
|
|
lw r1,[sp]
|
| 2354 |
|
|
ret #32
|
| 2355 |
|
|
|
| 2356 |
|
|
;==============================================================================
|
| 2357 |
|
|
;==============================================================================
|
| 2358 |
|
|
InitializeGame:
|
| 2359 |
|
|
subui sp,sp,#16
|
| 2360 |
|
|
sm [sp],r3/lr
|
| 2361 |
|
|
setlo r3,#320
|
| 2362 |
|
|
sc r3,Manpos
|
| 2363 |
|
|
sc r0,Score
|
| 2364 |
|
|
sb r0,MissileActive
|
| 2365 |
|
|
sc r0,MissileX
|
| 2366 |
|
|
sc r0,MissileY
|
| 2367 |
|
|
lm [sp],r3/lr
|
| 2368 |
|
|
ret #16
|
| 2369 |
|
|
|
| 2370 |
|
|
DrawScore:
|
| 2371 |
|
|
subui sp,sp,#24
|
| 2372 |
|
|
sm [sp],r1/r3/lr
|
| 2373 |
|
|
setlo r3,#1
|
| 2374 |
|
|
sb r3,CursorRow
|
| 2375 |
|
|
setlo r3,#40
|
| 2376 |
|
|
sb r3,CursorCol
|
| 2377 |
|
|
lb r1,Score
|
| 2378 |
|
|
call DisplayByte
|
| 2379 |
|
|
lb r1,Score+1
|
| 2380 |
|
|
call DisplayByte
|
| 2381 |
|
|
lm [sp],r1/r3/lr
|
| 2382 |
|
|
ret #24
|
| 2383 |
|
|
|
| 2384 |
|
|
DrawMissile:
|
| 2385 |
|
|
subui sp,sp,#16
|
| 2386 |
|
|
sm [sp],r1/lr
|
| 2387 |
|
|
lc r1,MissileY
|
| 2388 |
|
|
bleu r1,#2,MissileOff
|
| 2389 |
|
|
lc r1,MissileX
|
| 2390 |
|
|
shrui r1,r1,#3
|
| 2391 |
|
|
sb r1,CursorCol
|
| 2392 |
|
|
lc r1,MissileY
|
| 2393 |
|
|
sb r1,CursorRow
|
| 2394 |
|
|
subui r1,r1,#1
|
| 2395 |
|
|
sc r1,MissileY
|
| 2396 |
|
|
setlo r1,#'^'
|
| 2397 |
|
|
call DisplayChar
|
| 2398 |
|
|
lb r1,CursorCol
|
| 2399 |
|
|
subui r1,r1,#1
|
| 2400 |
|
|
sb r1,CursorCol
|
| 2401 |
|
|
lb r1,CursorRow
|
| 2402 |
|
|
subui r1,r1,#1
|
| 2403 |
|
|
sb r1,CursorRow
|
| 2404 |
|
|
setlo r1,#' '
|
| 2405 |
|
|
call DisplayChar
|
| 2406 |
|
|
lm [sp],r1/lr
|
| 2407 |
|
|
ret #16
|
| 2408 |
|
|
MissileOff:
|
| 2409 |
|
|
sb r0,MissileActive
|
| 2410 |
|
|
lc r1,MissileX
|
| 2411 |
|
|
shrui r1,r1,#3
|
| 2412 |
|
|
sb r1,CursorCol
|
| 2413 |
|
|
lc r1,MissileY
|
| 2414 |
|
|
sb r1,CursorRow
|
| 2415 |
|
|
setlo r1,#' '
|
| 2416 |
|
|
call DisplayChar
|
| 2417 |
|
|
lm [sp],r1/lr
|
| 2418 |
|
|
ret #16
|
| 2419 |
|
|
|
| 2420 |
|
|
DrawMan:
|
| 2421 |
|
|
subui sp,sp,#24
|
| 2422 |
|
|
sm [sp],r1/r3/lr
|
| 2423 |
|
|
setlo r3,#46
|
| 2424 |
|
|
sb r3,CursorRow
|
| 2425 |
|
|
lc r3,Manpos
|
| 2426 |
|
|
shrui r3,r3,#3
|
| 2427 |
|
|
sb r3,CursorCol
|
| 2428 |
|
|
setlo r1,#' '
|
| 2429 |
|
|
call DisplayChar
|
| 2430 |
|
|
setlo r1,#'#'
|
| 2431 |
|
|
call DisplayChar
|
| 2432 |
|
|
setlo r1,#'A'
|
| 2433 |
|
|
call DisplayChar
|
| 2434 |
|
|
setlo r1,#'#'
|
| 2435 |
|
|
call DisplayChar
|
| 2436 |
|
|
setlo r1,#' '
|
| 2437 |
|
|
call DisplayChar
|
| 2438 |
|
|
lm [sp],r1/r3/lr
|
| 2439 |
|
|
ret #24
|
| 2440 |
|
|
|
| 2441 |
|
|
DrawInvader:
|
| 2442 |
|
|
lw r3,InvaderPos
|
| 2443 |
|
|
lw r1,#233
|
| 2444 |
|
|
sc r1,[r3]
|
| 2445 |
|
|
lw r1,#242
|
| 2446 |
|
|
sc r1,1[r3]
|
| 2447 |
|
|
lw r1,#223
|
| 2448 |
|
|
sc r1,2[r3]
|
| 2449 |
|
|
ret
|
| 2450 |
|
|
|
| 2451 |
|
|
DrawInvaders:
|
| 2452 |
|
|
subui sp,sp,#40
|
| 2453 |
|
|
sm [sp],r1/r2/r3/r4/lr
|
| 2454 |
|
|
lc r1,InvadersRow1
|
| 2455 |
|
|
lc r4,InvadersColpos
|
| 2456 |
|
|
andi r2,r1,#1
|
| 2457 |
|
|
beq r2,r0,dinv1
|
| 2458 |
|
|
lb r3,InvadersRowpos
|
| 2459 |
|
|
sb r3,CursorRow
|
| 2460 |
|
|
sb r4,CursorCol
|
| 2461 |
|
|
setlo r1,#' '
|
| 2462 |
|
|
call DisplayByte
|
| 2463 |
|
|
setlo r1,#'#'
|
| 2464 |
|
|
call DisplayByte
|
| 2465 |
|
|
setlo r1,#'#'
|
| 2466 |
|
|
call DisplayByte
|
| 2467 |
|
|
setlo r1,#'#'
|
| 2468 |
|
|
call DisplayByte
|
| 2469 |
|
|
setlo r1,#' '
|
| 2470 |
|
|
call DisplayByte
|
| 2471 |
|
|
lb r1,CursorRow
|
| 2472 |
|
|
addui r1,r1,#1
|
| 2473 |
|
|
sb r1,CursorRow
|
| 2474 |
|
|
lb r1,CursorCol
|
| 2475 |
|
|
subui r1,r1,#5
|
| 2476 |
|
|
setlo r1,#' '
|
| 2477 |
|
|
call DisplayByte
|
| 2478 |
|
|
setlo r1,#'X'
|
| 2479 |
|
|
call DisplayByte
|
| 2480 |
|
|
setlo r1,#' '
|
| 2481 |
|
|
call DisplayByte
|
| 2482 |
|
|
setlo r1,#'X'
|
| 2483 |
|
|
call DisplayByte
|
| 2484 |
|
|
setlo r1,#' '
|
| 2485 |
|
|
call DisplayByte
|
| 2486 |
|
|
dinv1:
|
| 2487 |
|
|
lm [sp],r1/r2/r3/r4/lr
|
| 2488 |
|
|
ret #40
|
| 2489 |
|
|
DrawBombs:
|
| 2490 |
|
|
ret
|
| 2491 |
|
|
|
| 2492 |
|
|
Invaders:
|
| 2493 |
|
|
subui sp,#240
|
| 2494 |
|
|
sm [sp],r1/r2/r3/r4/lr
|
| 2495 |
|
|
call InitializeGame
|
| 2496 |
|
|
InvadersLoop:
|
| 2497 |
|
|
call DrawScore
|
| 2498 |
|
|
call DrawInvaders
|
| 2499 |
|
|
call DrawBombs
|
| 2500 |
|
|
call DrawMissile
|
| 2501 |
|
|
call DrawMan
|
| 2502 |
|
|
TestMoveMan:
|
| 2503 |
|
|
call KeybdGetChar
|
| 2504 |
|
|
beqi r1,#'k',MoveManRight
|
| 2505 |
|
|
beqi r1,#'j',MoveManLeft
|
| 2506 |
|
|
beqi r1,#' ',FireMissile
|
| 2507 |
|
|
bra Invaders1
|
| 2508 |
|
|
MoveManRight:
|
| 2509 |
|
|
lc r2,Manpos
|
| 2510 |
|
|
bgtu r2,#640,Invaders1
|
| 2511 |
|
|
addui r2,r2,#8
|
| 2512 |
|
|
sc r2,Manpos
|
| 2513 |
|
|
bra Invaders1
|
| 2514 |
|
|
MoveManLeft:
|
| 2515 |
|
|
lc r2,Manpos
|
| 2516 |
|
|
ble r2,r0,Invaders1
|
| 2517 |
|
|
subui r2,r2,#8
|
| 2518 |
|
|
sc r2,Manpos
|
| 2519 |
|
|
bra Invaders1
|
| 2520 |
|
|
FireMissile:
|
| 2521 |
|
|
lb r2,MissileActive
|
| 2522 |
|
|
bne r2,r0,Invaders1
|
| 2523 |
|
|
setlo r2,#1
|
| 2524 |
|
|
sb r2,MissileActive
|
| 2525 |
|
|
lc r2,Manpos
|
| 2526 |
|
|
sc r2,MissileX
|
| 2527 |
|
|
setlo r2,#46
|
| 2528 |
|
|
sc r2,MissileY
|
| 2529 |
|
|
bra Invaders1
|
| 2530 |
|
|
Invaders1:
|
| 2531 |
|
|
beqi r1,#CTRLC,InvadersEnd
|
| 2532 |
|
|
bra InvadersLoop
|
| 2533 |
|
|
InvadersEnd:
|
| 2534 |
|
|
lm [sp],r1/r2/r3/r4/lr
|
| 2535 |
|
|
addui sp,sp,#240
|
| 2536 |
|
|
bra Monitor
|
| 2537 |
|
|
|
| 2538 |
|
|
;==============================================================================
|
| 2539 |
|
|
;==============================================================================
|
| 2540 |
|
|
;****************************************************************;
|
| 2541 |
|
|
; ;
|
| 2542 |
|
|
; Tiny BASIC for the Raptor64 ;
|
| 2543 |
|
|
; ;
|
| 2544 |
|
|
; Derived from a 68000 derivative of Palo Alto Tiny BASIC as ;
|
| 2545 |
|
|
; published in the May 1976 issue of Dr. Dobb's Journal. ;
|
| 2546 |
|
|
; Adapted to the 68000 by: ;
|
| 2547 |
|
|
; Gordon brndly ;
|
| 2548 |
|
|
; 12147 - 51 Street ;
|
| 2549 |
|
|
; Edmonton AB T5W 3G8 ;
|
| 2550 |
|
|
; Canada ;
|
| 2551 |
|
|
; (updated mailing address for 1996) ;
|
| 2552 |
|
|
; ;
|
| 2553 |
|
|
; Adapted to the Raptor64 by: ;
|
| 2554 |
|
|
; Robert Finch ;
|
| 2555 |
|
|
; Ontario, Canada ;
|
| 2556 |
|
|
; robfinch<remove>@opencores.org ;
|
| 2557 |
|
|
;****************************************************************;
|
| 2558 |
|
|
; Copyright (C) 2012 by Robert Finch. This program may be ;
|
| 2559 |
|
|
; freely distributed for personal use only. All commercial ;
|
| 2560 |
|
|
; rights are reserved. ;
|
| 2561 |
|
|
;****************************************************************;
|
| 2562 |
|
|
;
|
| 2563 |
|
|
; Register Usage
|
| 2564 |
|
|
; r8 = text pointer (global usage)
|
| 2565 |
|
|
; r3,r4 = inputs parameters to subroutines
|
| 2566 |
|
|
; r2 = return value
|
| 2567 |
|
|
;
|
| 2568 |
|
|
;* Vers. 1.0 1984/7/17 - Original version by Gordon brndly
|
| 2569 |
|
|
;* 1.1 1984/12/9 - Addition of '0x' print term by Marvin Lipford
|
| 2570 |
|
|
;* 1.2 1985/4/9 - Bug fix in multiply routine by Rick Murray
|
| 2571 |
|
|
|
| 2572 |
|
|
;
|
| 2573 |
|
|
; Standard jump table. You can change these addresses if you are
|
| 2574 |
|
|
; customizing this interpreter for a different environment.
|
| 2575 |
|
|
;
|
| 2576 |
|
|
GOSTART:
|
| 2577 |
|
|
jmp CSTART ; Cold Start entry point
|
| 2578 |
|
|
GOWARM:
|
| 2579 |
|
|
jmp WSTART ; Warm Start entry point
|
| 2580 |
|
|
GOOUT:
|
| 2581 |
|
|
jmp OUTC ; Jump to character-out routine
|
| 2582 |
|
|
GOIN:
|
| 2583 |
|
|
jmp INC ;Jump to character-in routine
|
| 2584 |
|
|
GOAUXO:
|
| 2585 |
|
|
jmp AUXOUT ; Jump to auxiliary-out routine
|
| 2586 |
|
|
GOAUXI:
|
| 2587 |
|
|
jmp AUXIN ; Jump to auxiliary-in routine
|
| 2588 |
|
|
GOBYE:
|
| 2589 |
|
|
jmp BYEBYE ; Jump to monitor, DOS, etc.
|
| 2590 |
|
|
;
|
| 2591 |
|
|
; Modifiable system constants:
|
| 2592 |
|
|
;
|
| 2593 |
|
|
align 8
|
| 2594 |
|
|
TXTBGN dw 0x000000001_00600000 ;TXT ;beginning of program memory
|
| 2595 |
|
|
ENDMEM dw 0x000000001_07FFFFF8 ; end of available memory
|
| 2596 |
|
|
;
|
| 2597 |
|
|
; The main interpreter starts here:
|
| 2598 |
|
|
;
|
| 2599 |
|
|
; Usage
|
| 2600 |
|
|
; r1 = temp
|
| 2601 |
|
|
; r8 = text buffer pointer
|
| 2602 |
|
|
; r12 = end of text in text buffer
|
| 2603 |
|
|
;
|
| 2604 |
|
|
align 16
|
| 2605 |
|
|
CSTART:
|
| 2606 |
|
|
; First save off the link register and OS sp value
|
| 2607 |
|
|
subui sp,sp,#8
|
| 2608 |
|
|
sw lr,[sp]
|
| 2609 |
|
|
sw sp,OSSP
|
| 2610 |
|
|
lw sp,ENDMEM ; initialize stack pointer
|
| 2611 |
|
|
subui sp,sp,#8
|
| 2612 |
|
|
sw lr,[sp] ; save off return address
|
| 2613 |
|
|
sc r0,CursorRow ; set screen output
|
| 2614 |
|
|
sc r0,CursorCol
|
| 2615 |
|
|
sb r0,CursorFlash
|
| 2616 |
|
|
sw r0,pos
|
| 2617 |
|
|
lw r2,#0x10000020 ; black chars, yellow background
|
| 2618 |
|
|
sh r2,charToPrint
|
| 2619 |
|
|
call ClearScreen
|
| 2620 |
|
|
lea r1,msgInit ; tell who we are
|
| 2621 |
|
|
call PRMESGAUX
|
| 2622 |
|
|
lea r1,msgInit ; tell who we are
|
| 2623 |
|
|
call PRMESG
|
| 2624 |
|
|
lw r1,TXTBGN ; init. end-of-program pointer
|
| 2625 |
|
|
sw r1,TXTUNF
|
| 2626 |
|
|
lw r1,ENDMEM ; get address of end of memory
|
| 2627 |
|
|
subui r1,r1,#2048 ; reserve 2K for the stack
|
| 2628 |
|
|
sw r1,STKBOT
|
| 2629 |
|
|
subui r1,r1,#8192 ; 1000 vars
|
| 2630 |
|
|
sw r1,VARBGN
|
| 2631 |
|
|
call clearVars ; clear the variable area
|
| 2632 |
|
|
lw r1,VARBGN ; calculate number of bytes free
|
| 2633 |
|
|
lw r3,TXTUNF
|
| 2634 |
|
|
sub r1,r1,r3
|
| 2635 |
|
|
setlo r2,#0
|
| 2636 |
|
|
call PRTNUM
|
| 2637 |
|
|
lea r1,msgBytesFree
|
| 2638 |
|
|
call PRMESG
|
| 2639 |
|
|
WSTART:
|
| 2640 |
|
|
sw r0,LOPVAR ; initialize internal variables
|
| 2641 |
|
|
sw r0,STKGOS
|
| 2642 |
|
|
sw r0,CURRNT ; current line number pointer = 0
|
| 2643 |
|
|
lw sp,ENDMEM ; init S.P. again, just in case
|
| 2644 |
|
|
lea r1,msgReady ; display "Ready"
|
| 2645 |
|
|
call PRMESG
|
| 2646 |
|
|
ST3:
|
| 2647 |
|
|
setlo r1,#'>' ; Prompt with a '>' and
|
| 2648 |
|
|
call GETLN ; read a line.
|
| 2649 |
|
|
call TOUPBUF ; convert to upper case
|
| 2650 |
|
|
mov r12,r8 ; save pointer to end of line
|
| 2651 |
|
|
lea r8,BUFFER ; point to the beginning of line
|
| 2652 |
|
|
call TSTNUM ; is there a number there?
|
| 2653 |
|
|
call IGNBLK ; skip trailing blanks
|
| 2654 |
|
|
; does line no. exist? (or nonzero?)
|
| 2655 |
|
|
beq r1,r0,DIRECT ; if not, it's a direct statement
|
| 2656 |
|
|
bleu r1,#0xFFFF,ST2 ; see if line no. is <= 16 bits
|
| 2657 |
|
|
lea r1,msgLineRange ; if not, we've overflowed
|
| 2658 |
|
|
bra ERROR
|
| 2659 |
|
|
ST2:
|
| 2660 |
|
|
; ugliness - store a character at potentially an
|
| 2661 |
|
|
; odd address (unaligned).
|
| 2662 |
|
|
mov r2,r1 ; r2 = line number
|
| 2663 |
|
|
sb r2,-2[r8]
|
| 2664 |
|
|
shrui r2,r2,#8
|
| 2665 |
|
|
sb r2,-1[r8] ; store the binary line no.
|
| 2666 |
|
|
subui r8,r8,#2
|
| 2667 |
|
|
call FNDLN ; find this line in save area
|
| 2668 |
|
|
mov r13,r9 ; save possible line pointer
|
| 2669 |
|
|
beq r1,r0,ST4 ; if not found, insert
|
| 2670 |
|
|
; here we found the line, so we're replacing the line
|
| 2671 |
|
|
; in the text area
|
| 2672 |
|
|
; first step - delete the line
|
| 2673 |
|
|
setlo r1,#0
|
| 2674 |
|
|
call FNDNXT ; find the next line (into r9)
|
| 2675 |
|
|
bne r1,r0,ST7
|
| 2676 |
|
|
beq r9,r0,ST6 ; no more lines
|
| 2677 |
|
|
ST7:
|
| 2678 |
|
|
mov r1,r9 ; r1 = pointer to next line
|
| 2679 |
|
|
mov r2,r13 ; pointer to line to be deleted
|
| 2680 |
|
|
lw r3,TXTUNF ; points to top of save area
|
| 2681 |
|
|
call MVUP ; move up to delete
|
| 2682 |
|
|
sw r2,TXTUNF ; update the end pointer
|
| 2683 |
|
|
; we moved the lines of text after the line being
|
| 2684 |
|
|
; deleted down, so the pointer to the next line
|
| 2685 |
|
|
; needs to be reset
|
| 2686 |
|
|
mov r9,r13
|
| 2687 |
|
|
bra ST4
|
| 2688 |
|
|
; here there were no more lines, so just move the
|
| 2689 |
|
|
; end of text pointer down
|
| 2690 |
|
|
ST6:
|
| 2691 |
|
|
sw r13,TXTUNF
|
| 2692 |
|
|
mov r9,r13
|
| 2693 |
|
|
ST4:
|
| 2694 |
|
|
; here we're inserting because the line wasn't found
|
| 2695 |
|
|
; or it was deleted from the text area
|
| 2696 |
|
|
mov r1,r12 ; calculate the length of new line
|
| 2697 |
|
|
sub r1,r1,r8
|
| 2698 |
|
|
blei r1,#3,ST3 ; is it just a line no. & CR? if so, it was just a delete
|
| 2699 |
|
|
|
| 2700 |
|
|
lw r11,TXTUNF ; compute new end of text
|
| 2701 |
|
|
mov r10,r11 ; r10 = old TXTUNF
|
| 2702 |
|
|
add r11,r11,r1 ; r11 = new top of TXTUNF (r1=line length)
|
| 2703 |
|
|
|
| 2704 |
|
|
lw r1,VARBGN ; see if there's enough room
|
| 2705 |
|
|
bltu r11,r1,ST5
|
| 2706 |
|
|
lea r1,msgTooBig ; if not, say so
|
| 2707 |
|
|
jmp ERROR
|
| 2708 |
|
|
|
| 2709 |
|
|
; open a space in the text area
|
| 2710 |
|
|
ST5:
|
| 2711 |
|
|
sw r11,TXTUNF ; if so, store new end position
|
| 2712 |
|
|
mov r1,r10 ; points to old end of text
|
| 2713 |
|
|
mov r2,r11 ; points to new end of text
|
| 2714 |
|
|
mov r3,r9 ; points to start of line after insert line
|
| 2715 |
|
|
call MVDOWN ; move things out of the way
|
| 2716 |
|
|
|
| 2717 |
|
|
; copy line into text space
|
| 2718 |
|
|
mov r1,r8 ; set up to do the insertion; move from buffer
|
| 2719 |
|
|
mov r2,r13 ; to vacated space
|
| 2720 |
|
|
mov r3,r12 ; until end of buffer
|
| 2721 |
|
|
call MVUP ; do it
|
| 2722 |
|
|
bra ST3 ; go back and get another line
|
| 2723 |
|
|
|
| 2724 |
|
|
;******************************************************************
|
| 2725 |
|
|
;
|
| 2726 |
|
|
; *** Tables *** DIRECT *** EXEC ***
|
| 2727 |
|
|
;
|
| 2728 |
|
|
; This section of the code tests a string against a table. When
|
| 2729 |
|
|
; a match is found, control is transferred to the section of
|
| 2730 |
|
|
; code according to the table.
|
| 2731 |
|
|
;
|
| 2732 |
|
|
; At 'EXEC', r8 should point to the string, r9 should point to
|
| 2733 |
|
|
; the character table, and r10 should point to the execution
|
| 2734 |
|
|
; table. At 'DIRECT', r8 should point to the string, r9 and
|
| 2735 |
|
|
; r10 will be set up to point to TAB1 and TAB1_1, which are
|
| 2736 |
|
|
; the tables of all direct and statement commands.
|
| 2737 |
|
|
;
|
| 2738 |
|
|
; A '.' in the string will terminate the test and the partial
|
| 2739 |
|
|
; match will be considered as a match, e.g. 'P.', 'PR.','PRI.',
|
| 2740 |
|
|
; 'PRIN.', or 'PRINT' will all match 'PRINT'.
|
| 2741 |
|
|
;
|
| 2742 |
|
|
; There are two tables: the character table and the execution
|
| 2743 |
|
|
; table. The character table consists of any number of text items.
|
| 2744 |
|
|
; Each item is a string of characters with the last character's
|
| 2745 |
|
|
; high bit set to one. The execution table holds a 32-bit
|
| 2746 |
|
|
; execution addresses that correspond to each entry in the
|
| 2747 |
|
|
; character table.
|
| 2748 |
|
|
;
|
| 2749 |
|
|
; The end of the character table is a 0 byte which corresponds
|
| 2750 |
|
|
; to the default routine in the execution table, which is
|
| 2751 |
|
|
; executed if none of the other table items are matched.
|
| 2752 |
|
|
;
|
| 2753 |
|
|
; Character-matching tables:
|
| 2754 |
|
|
align 8
|
| 2755 |
|
|
TAB1:
|
| 2756 |
|
|
db "LIS",'T'+0x80 ; Direct commands
|
| 2757 |
|
|
db "LOA",'D'+0x80
|
| 2758 |
|
|
db "NE",'W'+0x80
|
| 2759 |
|
|
db "RU",'N'+0x80
|
| 2760 |
|
|
db "SAV",'E'+0x80
|
| 2761 |
|
|
TAB2:
|
| 2762 |
|
|
db "NEX",'T'+0x80 ; Direct / statement
|
| 2763 |
|
|
db "LE",'T'+0x80
|
| 2764 |
|
|
db "I",'F'+0x80
|
| 2765 |
|
|
db "GOT",'O'+0x80
|
| 2766 |
|
|
db "GOSU",'B'+0x80
|
| 2767 |
|
|
db "RETUR",'N'+0x80
|
| 2768 |
|
|
db "RE",'M'+0x80
|
| 2769 |
|
|
db "FO",'R'+0x80
|
| 2770 |
|
|
db "INPU",'T'+0x80
|
| 2771 |
|
|
db "PRIN",'T'+0x80
|
| 2772 |
|
|
db "POKE",'C'+0x80
|
| 2773 |
|
|
db "POKE",'H'+0x80
|
| 2774 |
|
|
db "POKE",'W'+0x80
|
| 2775 |
|
|
db "POK",'E'+0x80
|
| 2776 |
|
|
db "STO",'P'+0x80
|
| 2777 |
|
|
db "BY",'E'+0x80
|
| 2778 |
|
|
db "SY",'S'+0x80
|
| 2779 |
|
|
db "CL",'S'+0x80
|
| 2780 |
|
|
db "CL",'R'+0x80
|
| 2781 |
|
|
db "RDC",'F'+0x80
|
| 2782 |
|
|
db 0
|
| 2783 |
|
|
TAB4:
|
| 2784 |
|
|
db "PEEK",'C'+0x80 ;Functions
|
| 2785 |
|
|
db "PEEK",'H'+0x80 ;Functions
|
| 2786 |
|
|
db "PEEK",'W'+0x80 ;Functions
|
| 2787 |
|
|
db "PEE",'K'+0x80 ;Functions
|
| 2788 |
|
|
db "RN",'D'+0x80
|
| 2789 |
|
|
db "AB",'S'+0x80
|
| 2790 |
|
|
db "SIZ",'E'+0x80
|
| 2791 |
|
|
db "US",'R'+0x80
|
| 2792 |
|
|
db 0
|
| 2793 |
|
|
TAB5:
|
| 2794 |
|
|
db "T",'O'+0x80 ;"TO" in "FOR"
|
| 2795 |
|
|
db 0
|
| 2796 |
|
|
TAB6:
|
| 2797 |
|
|
db "STE",'P'+0x80 ;"STEP" in "FOR"
|
| 2798 |
|
|
db 0
|
| 2799 |
|
|
TAB8:
|
| 2800 |
|
|
db '>','='+0x80 ;Relational operators
|
| 2801 |
|
|
db '<','>'+0x80
|
| 2802 |
|
|
db '>'+0x80
|
| 2803 |
|
|
db '='+0x80
|
| 2804 |
|
|
db '<','='+0x80
|
| 2805 |
|
|
db '<'+0x80
|
| 2806 |
|
|
db 0
|
| 2807 |
|
|
TAB9:
|
| 2808 |
|
|
db "AN",'D'+0x80
|
| 2809 |
|
|
db 0
|
| 2810 |
|
|
TAB10:
|
| 2811 |
|
|
db "O",'R'+0x80
|
| 2812 |
|
|
db 0
|
| 2813 |
|
|
|
| 2814 |
|
|
.align 8
|
| 2815 |
|
|
|
| 2816 |
|
|
;* Execution address tables:
|
| 2817 |
|
|
TAB1_1:
|
| 2818 |
|
|
dw LISTX ;Direct commands
|
| 2819 |
|
|
dw LOAD
|
| 2820 |
|
|
dw NEW
|
| 2821 |
|
|
dw RUN
|
| 2822 |
|
|
dw SAVE
|
| 2823 |
|
|
TAB2_1:
|
| 2824 |
|
|
dw NEXT ; Direct / statement
|
| 2825 |
|
|
dw LET
|
| 2826 |
|
|
dw IF
|
| 2827 |
|
|
dw GOTO
|
| 2828 |
|
|
dw GOSUB
|
| 2829 |
|
|
dw RETURN
|
| 2830 |
|
|
dw IF2 ; REM
|
| 2831 |
|
|
dw FOR
|
| 2832 |
|
|
dw INPUT
|
| 2833 |
|
|
dw PRINT
|
| 2834 |
|
|
dw POKEC
|
| 2835 |
|
|
dw POKEH
|
| 2836 |
|
|
dw POKEW
|
| 2837 |
|
|
dw POKE
|
| 2838 |
|
|
dw STOP
|
| 2839 |
|
|
dw GOBYE
|
| 2840 |
|
|
dw SYSX
|
| 2841 |
|
|
dw _cls
|
| 2842 |
|
|
dw _clr
|
| 2843 |
|
|
dw _rdcf
|
| 2844 |
|
|
dw DEFLT
|
| 2845 |
|
|
TAB4_1:
|
| 2846 |
|
|
dw PEEKC
|
| 2847 |
|
|
dw PEEKH
|
| 2848 |
|
|
dw PEEKW
|
| 2849 |
|
|
dw PEEK ;Functions
|
| 2850 |
|
|
dw RND
|
| 2851 |
|
|
dw ABS
|
| 2852 |
|
|
dw SIZEX
|
| 2853 |
|
|
dw USRX
|
| 2854 |
|
|
dw XP40
|
| 2855 |
|
|
TAB5_1
|
| 2856 |
|
|
dw FR1 ;"TO" in "FOR"
|
| 2857 |
|
|
dw QWHAT
|
| 2858 |
|
|
TAB6_1
|
| 2859 |
|
|
dw FR2 ;"STEP" in "FOR"
|
| 2860 |
|
|
dw FR3
|
| 2861 |
|
|
TAB8_1
|
| 2862 |
|
|
dw XP11 ;>= Relational operators
|
| 2863 |
|
|
dw XP12 ;<>
|
| 2864 |
|
|
dw XP13 ;>
|
| 2865 |
|
|
dw XP15 ;=
|
| 2866 |
|
|
dw XP14 ;<=
|
| 2867 |
|
|
dw XP16 ;<
|
| 2868 |
|
|
dw XP17
|
| 2869 |
|
|
TAB9_1
|
| 2870 |
|
|
dw XP_AND
|
| 2871 |
|
|
dw XP_ANDX
|
| 2872 |
|
|
TAB10_1
|
| 2873 |
|
|
dw XP_OR
|
| 2874 |
|
|
dw XP_ORX
|
| 2875 |
|
|
|
| 2876 |
|
|
.align 16
|
| 2877 |
|
|
|
| 2878 |
27 |
robfinch |
;*
|
| 2879 |
43 |
robfinch |
; r3 = match flag (trashed)
|
| 2880 |
|
|
; r9 = text table
|
| 2881 |
|
|
; r10 = exec table
|
| 2882 |
|
|
; r11 = trashed
|
| 2883 |
|
|
DIRECT:
|
| 2884 |
|
|
lea r9,TAB1
|
| 2885 |
|
|
lea r10,TAB1_1
|
| 2886 |
|
|
EXEC:
|
| 2887 |
|
|
mov r11,lr ; save link reg
|
| 2888 |
|
|
call IGNBLK ; ignore leading blanks
|
| 2889 |
|
|
mov lr,r11 ; restore link reg
|
| 2890 |
|
|
mov r11,r8 ; save the pointer
|
| 2891 |
|
|
setlo r3,#0 ; clear match flag
|
| 2892 |
|
|
EXLP:
|
| 2893 |
|
|
lbu r1,[r8] ; get the program character
|
| 2894 |
|
|
addui r8,r8,#1
|
| 2895 |
|
|
lbu r2,[r9] ; get the table character
|
| 2896 |
|
|
bne r2,r0,EXNGO ; If end of table,
|
| 2897 |
|
|
mov r8,r11 ; restore the text pointer and...
|
| 2898 |
|
|
bra EXGO ; execute the default.
|
| 2899 |
|
|
EXNGO:
|
| 2900 |
|
|
beq r1,r3,EXGO ; Else check for period... if so, execute
|
| 2901 |
|
|
andi r2,r2,#0x7f ; ignore the table's high bit
|
| 2902 |
|
|
beq r2,r1,EXMAT; is there a match?
|
| 2903 |
|
|
addui r10,r10,#8 ;if not, try the next entry
|
| 2904 |
|
|
mov r8,r11 ; reset the program pointer
|
| 2905 |
|
|
setlo r3,#0 ; sorry, no match
|
| 2906 |
|
|
EX1:
|
| 2907 |
|
|
addui r9,r9,#1
|
| 2908 |
|
|
lb r1,-1[r9] ; get to the end of the entry
|
| 2909 |
|
|
bgt r1,r0,EX1
|
| 2910 |
|
|
bra EXLP ; back for more matching
|
| 2911 |
|
|
EXMAT:
|
| 2912 |
|
|
setlo r3,#'.' ; we've got a match so far
|
| 2913 |
|
|
addui r9,r9,#1
|
| 2914 |
|
|
lb r1,-1[r9] ; end of table entry?
|
| 2915 |
|
|
bgt r1,r0,EXLP ; if not, go back for more
|
| 2916 |
|
|
EXGO:
|
| 2917 |
|
|
lw r11,[r10] ; execute the appropriate routine
|
| 2918 |
|
|
jal r0,[r11]
|
| 2919 |
|
|
|
| 2920 |
|
|
; lb r1,[r8] ; get token from text space
|
| 2921 |
|
|
; bpl
|
| 2922 |
|
|
; and r1,#0x7f
|
| 2923 |
|
|
; shl r1,#2 ; * 4 - word offset
|
| 2924 |
|
|
; add r1,r1,#TAB1_1
|
| 2925 |
|
|
; lw r1,[r1]
|
| 2926 |
|
|
; jmp [r1]
|
| 2927 |
|
|
|
| 2928 |
|
|
|
| 2929 |
|
|
;******************************************************************
|
| 2930 |
|
|
;
|
| 2931 |
|
|
; What follows is the code to execute direct and statement
|
| 2932 |
|
|
; commands. Control is transferred to these points via the command
|
| 2933 |
|
|
; table lookup code of 'DIRECT' and 'EXEC' in the last section.
|
| 2934 |
|
|
; After the command is executed, control is transferred to other
|
| 2935 |
|
|
; sections as follows:
|
| 2936 |
|
|
;
|
| 2937 |
|
|
; For 'LISTX', 'NEW', and 'STOP': go back to the warm start point.
|
| 2938 |
|
|
; For 'RUN': go execute the first stored line if any; else go
|
| 2939 |
|
|
; back to the warm start point.
|
| 2940 |
|
|
; For 'GOTO' and 'GOSUB': go execute the target line.
|
| 2941 |
|
|
; For 'RETURN' and 'NEXT'; go back to saved return line.
|
| 2942 |
|
|
; For all others: if 'CURRNT' is 0, go to warm start; else go
|
| 2943 |
|
|
; execute next command. (This is done in 'FINISH'.)
|
| 2944 |
|
|
;
|
| 2945 |
|
|
;******************************************************************
|
| 2946 |
|
|
;
|
| 2947 |
|
|
; *** NEW *** STOP *** RUN (& friends) *** GOTO ***
|
| 2948 |
|
|
;
|
| 2949 |
|
|
; 'NEW<CR>' sets TXTUNF to point to TXTBGN
|
| 2950 |
|
|
;
|
| 2951 |
|
|
; 'STOP<CR>' goes back to WSTART
|
| 2952 |
|
|
;
|
| 2953 |
|
|
; 'RUN<CR>' finds the first stored line, stores its address
|
| 2954 |
|
|
; in CURRNT, and starts executing it. Note that only those
|
| 2955 |
|
|
; commands in TAB2 are legal for a stored program.
|
| 2956 |
|
|
;
|
| 2957 |
|
|
; There are 3 more entries in 'RUN':
|
| 2958 |
|
|
; 'RUNNXL' finds next line, stores it's address and executes it.
|
| 2959 |
|
|
; 'RUNTSL' stores the address of this line and executes it.
|
| 2960 |
|
|
; 'RUNSML' continues the execution on same line.
|
| 2961 |
|
|
;
|
| 2962 |
|
|
; 'GOTO expr<CR>' evaluates the expression, finds the target
|
| 2963 |
|
|
; line, and jumps to 'RUNTSL' to do it.
|
| 2964 |
|
|
;
|
| 2965 |
|
|
NEW:
|
| 2966 |
|
|
call ENDCHK
|
| 2967 |
|
|
lw r1,TXTBGN
|
| 2968 |
|
|
sw r1,TXTUNF ; set the end pointer
|
| 2969 |
|
|
call clearVars
|
| 2970 |
|
|
|
| 2971 |
|
|
STOP:
|
| 2972 |
|
|
call ENDCHK
|
| 2973 |
|
|
bra WSTART ; WSTART will reset the stack
|
| 2974 |
|
|
|
| 2975 |
|
|
RUN:
|
| 2976 |
|
|
call ENDCHK
|
| 2977 |
|
|
lw r8,TXTBGN ; set pointer to beginning
|
| 2978 |
|
|
sw r8,CURRNT
|
| 2979 |
|
|
call clearVars
|
| 2980 |
|
|
|
| 2981 |
|
|
RUNNXL: ; RUN <next line>
|
| 2982 |
|
|
lw r1,CURRNT ; executing a program?
|
| 2983 |
|
|
beq r1,r0,WSTART ; if not, we've finished a direct stat.
|
| 2984 |
|
|
setlo r1,#0 ; else find the next line number
|
| 2985 |
|
|
mov r9,r8
|
| 2986 |
|
|
call FNDLNP ; search for the next line
|
| 2987 |
|
|
bne r1,r0,RUNTSL
|
| 2988 |
|
|
bne r9,r0,RUNTSL
|
| 2989 |
|
|
bra WSTART ; if we've fallen off the end, stop
|
| 2990 |
|
|
|
| 2991 |
|
|
RUNTSL: ; RUN <this line>
|
| 2992 |
|
|
sw r9,CURRNT ; set CURRNT to point to the line no.
|
| 2993 |
|
|
lea r8,2[r9] ; set the text pointer to
|
| 2994 |
|
|
|
| 2995 |
|
|
RUNSML: ; RUN <same line>
|
| 2996 |
|
|
call CHKIO ; see if a control-C was pressed
|
| 2997 |
|
|
lea r9,TAB2 ; find command in TAB2
|
| 2998 |
|
|
lea r10,TAB2_1
|
| 2999 |
|
|
bra EXEC ; and execute it
|
| 3000 |
|
|
|
| 3001 |
|
|
GOTO:
|
| 3002 |
|
|
call OREXPR ;evaluate the following expression
|
| 3003 |
|
|
mov r5,r1
|
| 3004 |
|
|
call ENDCHK ;must find end of line
|
| 3005 |
|
|
mov r1,r5
|
| 3006 |
|
|
call FNDLN ; find the target line
|
| 3007 |
|
|
bne r1,r0,RUNTSL ; go do it
|
| 3008 |
|
|
lea r1,msgBadGotoGosub
|
| 3009 |
|
|
bra ERROR ; no such line no.
|
| 3010 |
|
|
|
| 3011 |
|
|
_clr:
|
| 3012 |
|
|
call clearVars
|
| 3013 |
|
|
bra FINISH
|
| 3014 |
|
|
|
| 3015 |
|
|
; Clear the variable area of memory
|
| 3016 |
|
|
clearVars:
|
| 3017 |
|
|
subui sp,sp,#16
|
| 3018 |
|
|
sw r6,[sp]
|
| 3019 |
|
|
sw lr,8[sp]
|
| 3020 |
|
|
setlo r6,#2048 ; number of words to clear
|
| 3021 |
|
|
lw r1,VARBGN
|
| 3022 |
|
|
cv1:
|
| 3023 |
|
|
sw r0,[r1]
|
| 3024 |
|
|
add r1,r1,#8
|
| 3025 |
|
|
loop r6,cv1
|
| 3026 |
|
|
lw lr,8[sp]
|
| 3027 |
|
|
lw r6,[sp]
|
| 3028 |
|
|
ret #16
|
| 3029 |
|
|
|
| 3030 |
|
|
|
| 3031 |
|
|
;******************************************************************
|
| 3032 |
|
|
; LIST
|
| 3033 |
|
|
;
|
| 3034 |
|
|
; LISTX has two forms:
|
| 3035 |
|
|
; 'LIST<CR>' lists all saved lines
|
| 3036 |
|
|
; 'LIST #<CR>' starts listing at the line #
|
| 3037 |
|
|
; Control-S pauses the listing, control-C stops it.
|
| 3038 |
|
|
;******************************************************************
|
| 3039 |
|
|
;
|
| 3040 |
|
|
LISTX:
|
| 3041 |
|
|
call TSTNUM ; see if there's a line no.
|
| 3042 |
|
|
mov r5,r1
|
| 3043 |
|
|
call ENDCHK ; if not, we get a zero
|
| 3044 |
|
|
mov r1,r5
|
| 3045 |
|
|
call FNDLN ; find this or next line
|
| 3046 |
|
|
LS1:
|
| 3047 |
|
|
bne r1,r0,LS4
|
| 3048 |
|
|
beq r9,r0,WSTART ; warm start if we passed the end
|
| 3049 |
|
|
LS4:
|
| 3050 |
|
|
mov r1,r9
|
| 3051 |
|
|
call PRTLN ; print the line
|
| 3052 |
|
|
mov r9,r1 ; set pointer for next
|
| 3053 |
|
|
call CHKIO ; check for listing halt request
|
| 3054 |
|
|
beq r1,r0,LS3
|
| 3055 |
|
|
bnei r1,#CTRLS,LS3 ; pause the listing?
|
| 3056 |
|
|
LS2:
|
| 3057 |
|
|
call CHKIO ; if so, wait for another keypress
|
| 3058 |
|
|
beq r1,r0,LS2
|
| 3059 |
|
|
LS3:
|
| 3060 |
|
|
setlo r1,#0
|
| 3061 |
|
|
call FNDLNP ; find the next line
|
| 3062 |
|
|
bra LS1
|
| 3063 |
|
|
|
| 3064 |
|
|
|
| 3065 |
|
|
;******************************************************************
|
| 3066 |
|
|
; PRINT command is 'PRINT ....:' or 'PRINT ....<CR>'
|
| 3067 |
|
|
; where '....' is a list of expressions, formats, back-arrows,
|
| 3068 |
|
|
; and strings. These items a separated by commas.
|
| 3069 |
|
|
;
|
| 3070 |
|
|
; A format is a pound sign followed by a number. It controls
|
| 3071 |
|
|
; the number of spaces the value of an expression is going to
|
| 3072 |
|
|
; be printed in. It stays effective for the rest of the print
|
| 3073 |
|
|
; command unless changed by another format. If no format is
|
| 3074 |
|
|
; specified, 11 positions will be used.
|
| 3075 |
|
|
;
|
| 3076 |
|
|
; A string is quoted in a pair of single- or double-quotes.
|
| 3077 |
|
|
;
|
| 3078 |
|
|
; An underline (back-arrow) means generate a <CR> without a <LF>
|
| 3079 |
|
|
;
|
| 3080 |
|
|
; A <CR LF> is generated after the entire list has been printed
|
| 3081 |
|
|
; or if the list is empty. If the list ends with a semicolon,
|
| 3082 |
|
|
; however, no <CR LF> is generated.
|
| 3083 |
|
|
;******************************************************************
|
| 3084 |
|
|
;
|
| 3085 |
|
|
PRINT:
|
| 3086 |
|
|
lw r5,#11 ; D4 = number of print spaces
|
| 3087 |
|
|
setlo r3,#':'
|
| 3088 |
|
|
lea r4,PR2
|
| 3089 |
|
|
call TSTC ; if null list and ":"
|
| 3090 |
|
|
call CRLF ; give CR-LF and continue
|
| 3091 |
|
|
bra RUNSML ; execution on the same line
|
| 3092 |
|
|
PR2:
|
| 3093 |
|
|
setlo r3,#CR
|
| 3094 |
|
|
lea r4,PR0
|
| 3095 |
|
|
call TSTC ;if null list and <CR>
|
| 3096 |
|
|
call CRLF ;also give CR-LF and
|
| 3097 |
|
|
bra RUNNXL ;execute the next line
|
| 3098 |
|
|
PR0:
|
| 3099 |
|
|
setlo r3,#'#'
|
| 3100 |
|
|
lea r4,PR1
|
| 3101 |
|
|
call TSTC ;else is it a format?
|
| 3102 |
|
|
call OREXPR ; yes, evaluate expression
|
| 3103 |
|
|
lw r5,r1 ; and save it as print width
|
| 3104 |
|
|
bra PR3 ; look for more to print
|
| 3105 |
|
|
PR1:
|
| 3106 |
|
|
setlo r3,#'$'
|
| 3107 |
|
|
lea r4,PR4
|
| 3108 |
|
|
call TSTC ; is character expression? (MRL)
|
| 3109 |
|
|
call OREXPR ; yep. Evaluate expression (MRL)
|
| 3110 |
|
|
call GOOUT ; print low byte (MRL)
|
| 3111 |
|
|
bra PR3 ;look for more. (MRL)
|
| 3112 |
|
|
PR4:
|
| 3113 |
|
|
call QTSTG ; is it a string?
|
| 3114 |
|
|
; the following branch must occupy only two bytes!
|
| 3115 |
|
|
bra PR8 ; if not, must be an expression
|
| 3116 |
|
|
PR3:
|
| 3117 |
|
|
setlo r3,#','
|
| 3118 |
|
|
lea r4,PR6
|
| 3119 |
|
|
call TSTC ; if ",", go find next
|
| 3120 |
|
|
call FIN ;in the list.
|
| 3121 |
|
|
bra PR0
|
| 3122 |
|
|
PR6:
|
| 3123 |
|
|
call CRLF ;list ends here
|
| 3124 |
|
|
bra FINISH
|
| 3125 |
|
|
PR8:
|
| 3126 |
|
|
call OREXPR ; evaluate the expression
|
| 3127 |
|
|
lw r2,r5 ; set the width
|
| 3128 |
|
|
call PRTNUM ; print its value
|
| 3129 |
|
|
bra PR3 ; more to print?
|
| 3130 |
|
|
|
| 3131 |
|
|
FINISH:
|
| 3132 |
|
|
call FIN ; Check end of command
|
| 3133 |
|
|
jmp QWHAT ; print "What?" if wrong
|
| 3134 |
|
|
|
| 3135 |
|
|
|
| 3136 |
|
|
;*******************************************************************
|
| 3137 |
|
|
;
|
| 3138 |
|
|
; *** GOSUB *** & RETURN ***
|
| 3139 |
|
|
;
|
| 3140 |
|
|
; 'GOSUB expr:' or 'GOSUB expr<CR>' is like the 'GOTO' command,
|
| 3141 |
|
|
; except that the current text pointer, stack pointer, etc. are
|
| 3142 |
|
|
; saved so that execution can be continued after the subroutine
|
| 3143 |
|
|
; 'RETURN's. In order that 'GOSUB' can be nested (and even
|
| 3144 |
|
|
; recursive), the save area must be stacked. The stack pointer
|
| 3145 |
|
|
; is saved in 'STKGOS'. The old 'STKGOS' is saved on the stack.
|
| 3146 |
|
|
; If we are in the main routine, 'STKGOS' is zero (this was done
|
| 3147 |
|
|
; in the initialization section of the interpreter), but we still
|
| 3148 |
|
|
; save it as a flag for no further 'RETURN's.
|
| 3149 |
|
|
;******************************************************************
|
| 3150 |
|
|
;
|
| 3151 |
|
|
GOSUB:
|
| 3152 |
|
|
call PUSHA ; save the current 'FOR' parameters
|
| 3153 |
|
|
call OREXPR ; get line number
|
| 3154 |
|
|
call FNDLN ; find the target line
|
| 3155 |
|
|
bne r1,r0,gosub1
|
| 3156 |
|
|
lea r1,msgBadGotoGosub
|
| 3157 |
|
|
bra ERROR ; if not there, say "How?"
|
| 3158 |
|
|
gosub1:
|
| 3159 |
|
|
sub sp,sp,#24
|
| 3160 |
|
|
sw r8,[sp] ; save text pointer
|
| 3161 |
|
|
lw r1,CURRNT
|
| 3162 |
|
|
sw r1,8[sp] ; found it, save old 'CURRNT'...
|
| 3163 |
|
|
lw r1,STKGOS
|
| 3164 |
|
|
sw r1,16[sp] ; and 'STKGOS'
|
| 3165 |
|
|
sw r0,LOPVAR ; load new values
|
| 3166 |
|
|
sw sp,STKGOS
|
| 3167 |
|
|
bra RUNTSL
|
| 3168 |
|
|
|
| 3169 |
|
|
|
| 3170 |
|
|
;******************************************************************
|
| 3171 |
|
|
; 'RETURN<CR>' undoes everything that 'GOSUB' did, and thus
|
| 3172 |
|
|
; returns the execution to the command after the most recent
|
| 3173 |
|
|
; 'GOSUB'. If 'STKGOS' is zero, it indicates that we never had
|
| 3174 |
|
|
; a 'GOSUB' and is thus an error.
|
| 3175 |
|
|
;******************************************************************
|
| 3176 |
|
|
;
|
| 3177 |
|
|
RETURN:
|
| 3178 |
|
|
call ENDCHK ; there should be just a <CR>
|
| 3179 |
|
|
lw r1,STKGOS ; get old stack pointer
|
| 3180 |
|
|
bne r1,r0,return1
|
| 3181 |
|
|
lea r1,msgRetWoGosub
|
| 3182 |
|
|
bra ERROR ; if zero, it doesn't exist
|
| 3183 |
|
|
return1:
|
| 3184 |
|
|
mov sp,r1 ; else restore it
|
| 3185 |
|
|
lw r1,16[sp]
|
| 3186 |
|
|
sw r1,STKGOS ; and the old 'STKGOS'
|
| 3187 |
|
|
lw r1,8[sp]
|
| 3188 |
|
|
sw r1,CURRNT ; and the old 'CURRNT'
|
| 3189 |
|
|
lw r8,[sp] ; and the old text pointer
|
| 3190 |
|
|
add sp,sp,#24
|
| 3191 |
|
|
call POPA ;and the old 'FOR' parameters
|
| 3192 |
|
|
bra FINISH ;and we are back home
|
| 3193 |
|
|
|
| 3194 |
|
|
;******************************************************************
|
| 3195 |
|
|
; *** FOR *** & NEXT ***
|
| 3196 |
|
|
;
|
| 3197 |
|
|
; 'FOR' has two forms:
|
| 3198 |
|
|
; 'FOR var=exp1 TO exp2 STEP exp1' and 'FOR var=exp1 TO exp2'
|
| 3199 |
|
|
; The second form means the same thing as the first form with a
|
| 3200 |
|
|
; STEP of positive 1. The interpreter will find the variable 'var'
|
| 3201 |
|
|
; and set its value to the current value of 'exp1'. It also
|
| 3202 |
|
|
; evaluates 'exp2' and 'exp1' and saves all these together with
|
| 3203 |
|
|
; the text pointer, etc. in the 'FOR' save area, which consists of
|
| 3204 |
|
|
; 'LOPVAR', 'LOPINC', 'LOPLMT', 'LOPLN', and 'LOPPT'. If there is
|
| 3205 |
|
|
; already something in the save area (indicated by a non-zero
|
| 3206 |
|
|
; 'LOPVAR'), then the old save area is saved on the stack before
|
| 3207 |
|
|
; the new values are stored. The interpreter will then dig in the
|
| 3208 |
|
|
; stack and find out if this same variable was used in another
|
| 3209 |
|
|
; currently active 'FOR' loop. If that is the case, then the old
|
| 3210 |
|
|
; 'FOR' loop is deactivated. (i.e. purged from the stack)
|
| 3211 |
|
|
;******************************************************************
|
| 3212 |
|
|
;
|
| 3213 |
|
|
FOR:
|
| 3214 |
|
|
call PUSHA ; save the old 'FOR' save area
|
| 3215 |
|
|
call SETVAL ; set the control variable
|
| 3216 |
|
|
sw r1,LOPVAR ; save its address
|
| 3217 |
|
|
lea r9,TAB5
|
| 3218 |
|
|
lea r10,TAB5_1; use 'EXEC' to test for 'TO'
|
| 3219 |
|
|
jmp EXEC
|
| 3220 |
|
|
FR1:
|
| 3221 |
|
|
call OREXPR ; evaluate the limit
|
| 3222 |
|
|
sw r1,LOPLMT ; save that
|
| 3223 |
|
|
lea r9,TAB6
|
| 3224 |
|
|
lea r10,TAB6_1 ; use 'EXEC' to test for the word 'STEP
|
| 3225 |
|
|
jmp EXEC
|
| 3226 |
|
|
FR2:
|
| 3227 |
|
|
call OREXPR ; found it, get the step value
|
| 3228 |
|
|
bra FR4
|
| 3229 |
|
|
FR3:
|
| 3230 |
|
|
setlo r1,#1 ; not found, step defaults to 1
|
| 3231 |
|
|
FR4:
|
| 3232 |
|
|
sw r1,LOPINC ; save that too
|
| 3233 |
|
|
FR5:
|
| 3234 |
|
|
lw r2,CURRNT
|
| 3235 |
|
|
sw r2,LOPLN ; save address of current line number
|
| 3236 |
|
|
sw r8,LOPPT ; and text pointer
|
| 3237 |
|
|
lw r3,sp ; dig into the stack to find 'LOPVAR'
|
| 3238 |
|
|
lw r6,LOPVAR
|
| 3239 |
|
|
bra FR7
|
| 3240 |
|
|
FR6:
|
| 3241 |
|
|
addui r3,r3,#40 ; look at next stack frame
|
| 3242 |
|
|
FR7:
|
| 3243 |
|
|
lw r2,[r3] ; is it zero?
|
| 3244 |
|
|
beq r2,r0,FR8 ; if so, we're done
|
| 3245 |
|
|
bne r2,r6,FR6 ; same as current LOPVAR? nope, look some more
|
| 3246 |
|
|
|
| 3247 |
|
|
lw r1,r3 ; Else remove 5 long words from...
|
| 3248 |
|
|
addui r2,r3,#40 ; inside the stack.
|
| 3249 |
|
|
lw r3,sp
|
| 3250 |
|
|
call MVDOWN
|
| 3251 |
|
|
add sp,sp,#40 ; set the SP 5 long words up
|
| 3252 |
|
|
FR8:
|
| 3253 |
|
|
bra FINISH ; and continue execution
|
| 3254 |
|
|
|
| 3255 |
|
|
|
| 3256 |
|
|
;******************************************************************
|
| 3257 |
|
|
; 'NEXT var' serves as the logical (not necessarily physical) end
|
| 3258 |
|
|
; of the 'FOR' loop. The control variable 'var' is checked with
|
| 3259 |
|
|
; the 'LOPVAR'. If they are not the same, the interpreter digs in
|
| 3260 |
|
|
; the stack to find the right one and purges all those that didn't
|
| 3261 |
|
|
; match. Either way, it then adds the 'STEP' to that variable and
|
| 3262 |
|
|
; checks the result with against the limit value. If it is within
|
| 3263 |
|
|
; the limit, control loops back to the command following the
|
| 3264 |
|
|
; 'FOR'. If it's outside the limit, the save area is purged and
|
| 3265 |
|
|
; execution continues.
|
| 3266 |
|
|
;******************************************************************
|
| 3267 |
|
|
;
|
| 3268 |
|
|
NEXT:
|
| 3269 |
|
|
setlo r1,#0 ; don't allocate it
|
| 3270 |
|
|
call TSTV ; get address of variable
|
| 3271 |
|
|
bne r1,r0,NX4
|
| 3272 |
|
|
lea r1,msgNextVar
|
| 3273 |
|
|
bra ERROR ; if no variable, say "What?"
|
| 3274 |
|
|
NX4:
|
| 3275 |
|
|
mov r9,r1 ; save variable's address
|
| 3276 |
|
|
NX0:
|
| 3277 |
|
|
lw r1,LOPVAR ; If 'LOPVAR' is zero, we never...
|
| 3278 |
|
|
bne r1,r0,NX5 ; had a FOR loop
|
| 3279 |
|
|
lea r1,msgNextFor
|
| 3280 |
|
|
bra ERROR
|
| 3281 |
|
|
NX5:
|
| 3282 |
|
|
beq r1,r9,NX2 ; else we check them OK, they agree
|
| 3283 |
|
|
call POPA ; nope, let's see the next frame
|
| 3284 |
|
|
bra NX0
|
| 3285 |
|
|
NX2:
|
| 3286 |
|
|
lw r1,[r9] ; get control variable's value
|
| 3287 |
|
|
lw r2,LOPINC
|
| 3288 |
|
|
addu r1,r1,r2 ; add in loop increment
|
| 3289 |
|
|
; BVS.L QHOW say "How?" for 32-bit overflow
|
| 3290 |
|
|
sw r1,[r9] ; save control variable's new value
|
| 3291 |
|
|
lw r3,LOPLMT ; get loop's limit value
|
| 3292 |
|
|
bgt r2,r0,NX1 ; check loop increment, branch if loop increment is positive
|
| 3293 |
|
|
blt r1,r3,NXPurge ; test against limit
|
| 3294 |
|
|
bra NX3
|
| 3295 |
|
|
NX1:
|
| 3296 |
|
|
bgt r1,r3,NXPurge
|
| 3297 |
|
|
NX3:
|
| 3298 |
|
|
lw r8,LOPLN ; Within limit, go back to the...
|
| 3299 |
|
|
sw r8,CURRNT
|
| 3300 |
|
|
lw r8,LOPPT ; saved 'CURRNT' and text pointer.
|
| 3301 |
|
|
bra FINISH
|
| 3302 |
|
|
NXPurge:
|
| 3303 |
|
|
call POPA ; purge this loop
|
| 3304 |
|
|
bra FINISH
|
| 3305 |
|
|
|
| 3306 |
|
|
|
| 3307 |
|
|
;******************************************************************
|
| 3308 |
|
|
; *** REM *** IF *** INPUT *** LET (& DEFLT) ***
|
| 3309 |
|
|
;
|
| 3310 |
|
|
; 'REM' can be followed by anything and is ignored by the
|
| 3311 |
|
|
; interpreter.
|
| 3312 |
|
|
;
|
| 3313 |
|
|
;REM
|
| 3314 |
|
|
; br IF2 ; skip the rest of the line
|
| 3315 |
|
|
; 'IF' is followed by an expression, as a condition and one or
|
| 3316 |
|
|
; more commands (including other 'IF's) separated by colons.
|
| 3317 |
|
|
; Note that the word 'THEN' is not used. The interpreter evaluates
|
| 3318 |
|
|
; the expression. If it is non-zero, execution continues. If it
|
| 3319 |
|
|
; is zero, the commands that follow are ignored and execution
|
| 3320 |
|
|
; continues on the next line.
|
| 3321 |
|
|
;******************************************************************
|
| 3322 |
|
|
;
|
| 3323 |
|
|
IF:
|
| 3324 |
|
|
call OREXPR ; evaluate the expression
|
| 3325 |
|
|
IF1:
|
| 3326 |
|
|
bne r1,r0,RUNSML ; is it zero? if not, continue
|
| 3327 |
|
|
IF2:
|
| 3328 |
|
|
mov r9,r8 ; set lookup pointer
|
| 3329 |
|
|
setlo r1,#0 ; find line #0 (impossible)
|
| 3330 |
|
|
call FNDSKP ; if so, skip the rest of the line
|
| 3331 |
|
|
bgt r1,r0,WSTART ; if no next line, do a warm start
|
| 3332 |
|
|
IF3:
|
| 3333 |
|
|
bra RUNTSL ; run the next line
|
| 3334 |
|
|
|
| 3335 |
|
|
|
| 3336 |
|
|
;******************************************************************
|
| 3337 |
|
|
; INPUT is called first and establishes a stack frame
|
| 3338 |
|
|
INPERR:
|
| 3339 |
|
|
lw sp,STKINP ; restore the old stack pointer
|
| 3340 |
|
|
lw r8,16[sp]
|
| 3341 |
|
|
sw r8,CURRNT ; and old 'CURRNT'
|
| 3342 |
|
|
lw r8,8[sp] ; and old text pointer
|
| 3343 |
|
|
addui sp,sp,#40 ; fall through will subtract 40
|
| 3344 |
|
|
|
| 3345 |
|
|
; 'INPUT' is like the 'PRINT' command, and is followed by a list
|
| 3346 |
|
|
; of items. If the item is a string in single or double quotes,
|
| 3347 |
|
|
; or is an underline (back arrow), it has the same effect as in
|
| 3348 |
|
|
; 'PRINT'. If an item is a variable, this variable name is
|
| 3349 |
|
|
; printed out followed by a colon, then the interpreter waits for
|
| 3350 |
|
|
; an expression to be typed in. The variable is then set to the
|
| 3351 |
|
|
; value of this expression. If the variable is preceeded by a
|
| 3352 |
|
|
; string (again in single or double quotes), the string will be
|
| 3353 |
|
|
; displayed followed by a colon. The interpreter the waits for an
|
| 3354 |
|
|
; expression to be entered and sets the variable equal to the
|
| 3355 |
|
|
; expression's value. If the input expression is invalid, the
|
| 3356 |
|
|
; interpreter will print "What?", "How?", or "Sorry" and reprint
|
| 3357 |
|
|
; the prompt and redo the input. The execution will not terminate
|
| 3358 |
|
|
; unless you press control-C. This is handled in 'INPERR'.
|
| 3359 |
|
|
;
|
| 3360 |
|
|
INPUT:
|
| 3361 |
|
|
subui sp,sp,#40 ; allocate stack frame
|
| 3362 |
|
|
sw r5,32[sp]
|
| 3363 |
|
|
IP6:
|
| 3364 |
|
|
sw r8,[sp] ; save in case of error
|
| 3365 |
|
|
call QTSTG ; is next item a string?
|
| 3366 |
|
|
bra IP2 ; nope - this branch must take only two bytes
|
| 3367 |
|
|
setlo r1,#1 ; allocate var
|
| 3368 |
|
|
call TSTV ; yes, but is it followed by a variable?
|
| 3369 |
|
|
beq r1,r0,IP4 ; if not, brnch
|
| 3370 |
|
|
mov r10,r1 ; put away the variable's address
|
| 3371 |
|
|
bra IP3 ; if so, input to variable
|
| 3372 |
|
|
IP2:
|
| 3373 |
|
|
sw r8,8[sp] ; save for 'PRTSTG'
|
| 3374 |
|
|
setlo r1,#1
|
| 3375 |
|
|
call TSTV ; must be a variable now
|
| 3376 |
|
|
bne r1,r0,IP7
|
| 3377 |
|
|
lea r1,msgInputVar
|
| 3378 |
|
|
bra ERROR ; "What?" it isn't?
|
| 3379 |
|
|
IP7:
|
| 3380 |
|
|
mov r10,r1 ; put away the variable's address
|
| 3381 |
|
|
lb r5,[r8] ; get ready for 'PRTSTG' by null terminating
|
| 3382 |
|
|
sb r0,[r8]
|
| 3383 |
|
|
lw r1,8[sp] ; get back text pointer
|
| 3384 |
|
|
call PRTSTG ; print string as prompt
|
| 3385 |
|
|
sb r5,[r8] ; un-null terminate
|
| 3386 |
|
|
IP3
|
| 3387 |
|
|
sw r8,8[sp] ; save in case of error
|
| 3388 |
|
|
lw r1,CURRNT
|
| 3389 |
|
|
sw r1,16[sp] ; also save 'CURRNT'
|
| 3390 |
|
|
setlo r1,#-1
|
| 3391 |
|
|
sw r1,CURRNT ; flag that we are in INPUT
|
| 3392 |
|
|
sw sp,STKINP ; save the stack pointer too
|
| 3393 |
|
|
sw r10,24[sp] ; save the variable address
|
| 3394 |
|
|
setlo r1,#':' ; print a colon first
|
| 3395 |
|
|
call GETLN ; then get an input line
|
| 3396 |
|
|
lea r8,BUFFER ; point to the buffer
|
| 3397 |
|
|
call OREXPR ; evaluate the input
|
| 3398 |
|
|
lw r10,24[sp] ; restore the variable address
|
| 3399 |
|
|
sw r1,[r10] ; save value in variable
|
| 3400 |
|
|
lw r1,16[sp] ; restore old 'CURRNT'
|
| 3401 |
|
|
sw r1,CURRNT
|
| 3402 |
|
|
lw r8,8[sp] ; and the old text pointer
|
| 3403 |
|
|
IP4:
|
| 3404 |
|
|
setlo r3,#','
|
| 3405 |
|
|
lea r4,IP5 ; is the next thing a comma?
|
| 3406 |
|
|
call TSTC
|
| 3407 |
|
|
bra IP6 ; yes, more items
|
| 3408 |
|
|
IP5:
|
| 3409 |
|
|
lw r5,32[sp]
|
| 3410 |
|
|
add sp,sp,#40 ; clean up the stack
|
| 3411 |
|
|
jmp FINISH
|
| 3412 |
|
|
|
| 3413 |
|
|
|
| 3414 |
|
|
DEFLT:
|
| 3415 |
|
|
lb r1,[r8]
|
| 3416 |
|
|
beq r1,#CR,FINISH ; empty line is OK else it is 'LET'
|
| 3417 |
|
|
|
| 3418 |
|
|
|
| 3419 |
|
|
;******************************************************************
|
| 3420 |
|
|
; 'LET' is followed by a list of items separated by commas.
|
| 3421 |
|
|
; Each item consists of a variable, an equals sign, and an
|
| 3422 |
|
|
; expression. The interpreter evaluates the expression and sets
|
| 3423 |
|
|
; the variable to that value. The interpreter will also handle
|
| 3424 |
|
|
; 'LET' commands without the word 'LET'. This is done by 'DEFLT'.
|
| 3425 |
|
|
;******************************************************************
|
| 3426 |
|
|
;
|
| 3427 |
|
|
LET:
|
| 3428 |
|
|
call SETVAL ; do the assignment
|
| 3429 |
|
|
setlo r3,#','
|
| 3430 |
|
|
lea r4,FINISH
|
| 3431 |
|
|
call TSTC ; check for more 'LET' items
|
| 3432 |
|
|
bra LET
|
| 3433 |
|
|
LT1:
|
| 3434 |
|
|
bra FINISH ; until we are finished.
|
| 3435 |
|
|
|
| 3436 |
|
|
|
| 3437 |
|
|
;******************************************************************
|
| 3438 |
|
|
; *** LOAD *** & SAVE ***
|
| 3439 |
|
|
;
|
| 3440 |
|
|
; These two commands transfer a program to/from an auxiliary
|
| 3441 |
|
|
; device such as a cassette, another computer, etc. The program
|
| 3442 |
|
|
; is converted to an easily-stored format: each line starts with
|
| 3443 |
|
|
; a colon, the line no. as 4 hex digits, and the rest of the line.
|
| 3444 |
|
|
; At the end, a line starting with an '@' sign is sent. This
|
| 3445 |
|
|
; format can be read back with a minimum of processing time by
|
| 3446 |
|
|
; the Butterfly.
|
| 3447 |
|
|
;******************************************************************
|
| 3448 |
|
|
;
|
| 3449 |
|
|
LOAD
|
| 3450 |
|
|
lw r8,TXTBGN ; set pointer to start of prog. area
|
| 3451 |
|
|
setlo r1,#CR ; For a CP/M host, tell it we're ready...
|
| 3452 |
|
|
call GOAUXO ; by sending a CR to finish PIP command.
|
| 3453 |
|
|
LOD1:
|
| 3454 |
|
|
call GOAUXI ; look for start of line
|
| 3455 |
|
|
ble r1,r0,LOD1
|
| 3456 |
|
|
beq r1,#'@',LODEND ; end of program?
|
| 3457 |
|
|
beq r1,#0x1A,LODEND ; or EOF marker
|
| 3458 |
|
|
bne r1,#':',LOD1 ; if not, is it start of line? if not, wait for it
|
| 3459 |
|
|
call GCHAR ; get line number
|
| 3460 |
|
|
sb r1,[r8] ; store it
|
| 3461 |
|
|
shrui r1,r1,#8
|
| 3462 |
|
|
sb r1,1[r8]
|
| 3463 |
|
|
addui r8,r8,#2
|
| 3464 |
|
|
LOD2:
|
| 3465 |
|
|
call GOAUXI ; get another text char.
|
| 3466 |
|
|
ble r1,r0,LOD2
|
| 3467 |
|
|
sb r1,[r8]
|
| 3468 |
|
|
addui r8,r8,#1 ; store it
|
| 3469 |
|
|
bne r1,#CR,LOD2 ; is it the end of the line? if not, go back for more
|
| 3470 |
|
|
bra LOD1 ; if so, start a new line
|
| 3471 |
|
|
LODEND:
|
| 3472 |
|
|
sw r8,TXTUNF ; set end-of program pointer
|
| 3473 |
|
|
bra WSTART ; back to direct mode
|
| 3474 |
|
|
|
| 3475 |
|
|
|
| 3476 |
|
|
; get character from input (16 bit value)
|
| 3477 |
|
|
GCHAR:
|
| 3478 |
|
|
subui sp,sp,#24
|
| 3479 |
|
|
sw r5,[sp]
|
| 3480 |
|
|
sw r6,8[sp]
|
| 3481 |
|
|
sw lr,16[sp]
|
| 3482 |
|
|
setlo r6,#3 ; repeat four times
|
| 3483 |
|
|
setlo r5,#0
|
| 3484 |
|
|
GCHAR1:
|
| 3485 |
|
|
call GOAUXI ; get a char
|
| 3486 |
|
|
ble r1,r0,GCHAR1
|
| 3487 |
|
|
call asciiToHex
|
| 3488 |
|
|
shli r5,r5,#4
|
| 3489 |
|
|
or r5,r5,r1
|
| 3490 |
|
|
loop r6,GCHAR1
|
| 3491 |
|
|
mov r1,r5
|
| 3492 |
|
|
lw lr,16[sp]
|
| 3493 |
|
|
lw r6,8[sp]
|
| 3494 |
|
|
lw r5,[sp]
|
| 3495 |
|
|
ret #24
|
| 3496 |
|
|
|
| 3497 |
|
|
|
| 3498 |
|
|
; convert an ascii char to hex code
|
| 3499 |
|
|
; input
|
| 3500 |
|
|
; r1 = char to convert
|
| 3501 |
|
|
|
| 3502 |
|
|
asciiToHex:
|
| 3503 |
|
|
blei r1,#'9',a2h1 ; less than '9'
|
| 3504 |
|
|
subui r1,r1,#7 ; shift 'A' to '9'+1
|
| 3505 |
|
|
a2h1:
|
| 3506 |
|
|
subui r1,r1,#'0' ;
|
| 3507 |
|
|
andi r1,r1,#15 ; make sure a nybble
|
| 3508 |
|
|
ret
|
| 3509 |
|
|
|
| 3510 |
|
|
|
| 3511 |
|
|
|
| 3512 |
|
|
SAVE:
|
| 3513 |
|
|
lw r8,TXTBGN ;set pointer to start of prog. area
|
| 3514 |
|
|
lw r9,TXTUNF ;set pointer to end of prog. area
|
| 3515 |
|
|
SAVE1:
|
| 3516 |
|
|
call AUXOCRLF ; send out a CR & LF (CP/M likes this)
|
| 3517 |
|
|
bgeu r8,r9,SAVEND ; are we finished?
|
| 3518 |
|
|
setlo r1,#':' ; if not, start a line
|
| 3519 |
|
|
call GOAUXO
|
| 3520 |
|
|
lbu r1,[r8] ; get line number
|
| 3521 |
|
|
lbu r2,1[r8]
|
| 3522 |
|
|
shli r2,r2,#8
|
| 3523 |
|
|
or r1,r1,r2
|
| 3524 |
|
|
addui r8,r8,#2
|
| 3525 |
|
|
call PWORD ; output line number as 4-digit hex
|
| 3526 |
|
|
SAVE2:
|
| 3527 |
|
|
lb r1,[r8] ; get a text char.
|
| 3528 |
|
|
addui r8,r8,#1
|
| 3529 |
|
|
beqi r1,#CR,SAVE1 ; is it the end of the line? if so, send CR & LF and start new line
|
| 3530 |
|
|
call GOAUXO ; send it out
|
| 3531 |
|
|
bra SAVE2 ; go back for more text
|
| 3532 |
|
|
SAVEND:
|
| 3533 |
|
|
setlo r1,#'@' ; send end-of-program indicator
|
| 3534 |
|
|
call GOAUXO
|
| 3535 |
|
|
call AUXOCRLF ; followed by a CR & LF
|
| 3536 |
|
|
setlo r1,#0x1A ; and a control-Z to end the CP/M file
|
| 3537 |
|
|
call GOAUXO
|
| 3538 |
|
|
bra WSTART ; then go do a warm start
|
| 3539 |
|
|
|
| 3540 |
|
|
|
| 3541 |
|
|
; output a CR LF sequence to auxillary output
|
| 3542 |
|
|
; Registers Affected
|
| 3543 |
|
|
; r3 = LF
|
| 3544 |
|
|
AUXOCRLF:
|
| 3545 |
|
|
subui sp,sp,#8
|
| 3546 |
|
|
sw lr,[sp]
|
| 3547 |
|
|
setlo r1,#CR
|
| 3548 |
|
|
call GOAUXO
|
| 3549 |
|
|
setlo r1,#LF
|
| 3550 |
|
|
call GOAUXO
|
| 3551 |
|
|
lw lr,[sp]
|
| 3552 |
|
|
ret #8
|
| 3553 |
|
|
|
| 3554 |
|
|
|
| 3555 |
|
|
; output a word in hex format
|
| 3556 |
|
|
; tricky because of the need to reverse the order of the chars
|
| 3557 |
|
|
PWORD:
|
| 3558 |
|
|
sub sp,sp,#16
|
| 3559 |
|
|
sw lr,[sp]
|
| 3560 |
|
|
sw r5,8[sp]
|
| 3561 |
|
|
lea r5,NUMWKA+15
|
| 3562 |
|
|
mov r4,r1 ; r4 = value
|
| 3563 |
|
|
pword1:
|
| 3564 |
|
|
mov r1,r4 ; r1 = value
|
| 3565 |
|
|
shrui r4,r4,#4 ; shift over to next nybble
|
| 3566 |
|
|
call toAsciiHex ; convert LS nybble to ascii hex
|
| 3567 |
|
|
sb r1,[r5] ; save in work area
|
| 3568 |
|
|
subui r5,r5,#1
|
| 3569 |
|
|
cmpui r1,r5,#NUMWKA
|
| 3570 |
|
|
bge r1,r0,pword1
|
| 3571 |
|
|
pword2:
|
| 3572 |
|
|
addui r5,r5,#1
|
| 3573 |
|
|
lb r1,[r5] ; get char to output
|
| 3574 |
|
|
call GOAUXO ; send it
|
| 3575 |
|
|
cmpui r1,r5,#NUMWKA+15
|
| 3576 |
|
|
blt r1,r0,pword2
|
| 3577 |
|
|
lw r5,8[sp]
|
| 3578 |
|
|
lw lr,[sp]
|
| 3579 |
|
|
ret #16
|
| 3580 |
|
|
|
| 3581 |
|
|
|
| 3582 |
|
|
; convert nybble in r2 to ascii hex char2
|
| 3583 |
|
|
; r2 = character to convert
|
| 3584 |
|
|
|
| 3585 |
|
|
toAsciiHex:
|
| 3586 |
|
|
andi r1,r1,#15 ; make sure it's a nybble
|
| 3587 |
|
|
blti r1,#10,tah1 ; > 10 ?
|
| 3588 |
|
|
addi r1,r1,#7 ; bump it up to the letter 'A'
|
| 3589 |
|
|
tah1:
|
| 3590 |
|
|
addui r1,r1,#'0' ; bump up to ascii '0'
|
| 3591 |
|
|
ret
|
| 3592 |
|
|
|
| 3593 |
|
|
|
| 3594 |
|
|
|
| 3595 |
|
|
;******************************************************************
|
| 3596 |
|
|
; *** POKE *** & SYSX ***
|
| 3597 |
|
|
;
|
| 3598 |
|
|
; 'POKE expr1,expr2' stores the byte from 'expr2' into the memory
|
| 3599 |
|
|
; address specified by 'expr1'.
|
| 3600 |
|
|
;
|
| 3601 |
|
|
; 'SYSX expr' jumps to the machine language subroutine whose
|
| 3602 |
|
|
; starting address is specified by 'expr'. The subroutine can use
|
| 3603 |
|
|
; all registers but must leave the stack the way it found it.
|
| 3604 |
|
|
; The subroutine returns to the interpreter by executing an RET.
|
| 3605 |
|
|
;******************************************************************
|
| 3606 |
|
|
;
|
| 3607 |
|
|
POKE:
|
| 3608 |
|
|
subui sp,sp,#8
|
| 3609 |
|
|
call OREXPR ; get the memory address
|
| 3610 |
|
|
setlo r3,#','
|
| 3611 |
|
|
lea r4,PKER ; it must be followed by a comma
|
| 3612 |
|
|
call TSTC ; it must be followed by a comma
|
| 3613 |
|
|
sw r1,[sp] ; save the address
|
| 3614 |
|
|
call OREXPR ; get the byte to be POKE'd
|
| 3615 |
|
|
lw r2,[sp] ; get the address back
|
| 3616 |
|
|
sb r1,[r2] ; store the byte in memory
|
| 3617 |
|
|
addui sp,sp,#8
|
| 3618 |
|
|
bra FINISH
|
| 3619 |
|
|
PKER:
|
| 3620 |
|
|
lea r1,msgComma
|
| 3621 |
|
|
bra ERROR ; if no comma, say "What?"
|
| 3622 |
|
|
|
| 3623 |
|
|
POKEC:
|
| 3624 |
|
|
subui sp,sp,#8
|
| 3625 |
|
|
call OREXPR ; get the memory address
|
| 3626 |
|
|
setlo r3,#','
|
| 3627 |
|
|
lea r4,PKER ; it must be followed by a comma
|
| 3628 |
|
|
call TSTC ; it must be followed by a comma
|
| 3629 |
|
|
sw r1,[sp] ; save the address
|
| 3630 |
|
|
call OREXPR ; get the byte to be POKE'd
|
| 3631 |
|
|
lw r2,[sp] ; get the address back
|
| 3632 |
|
|
sc r1,[r2] ; store the char in memory
|
| 3633 |
|
|
addui sp,sp,#8
|
| 3634 |
|
|
jmp FINISH
|
| 3635 |
|
|
|
| 3636 |
|
|
POKEH:
|
| 3637 |
|
|
subui sp,sp,#8
|
| 3638 |
|
|
call OREXPR ; get the memory address
|
| 3639 |
|
|
setlo r3,#','
|
| 3640 |
|
|
lea r4,PKER ; it must be followed by a comma
|
| 3641 |
|
|
call TSTC
|
| 3642 |
|
|
sw r1,[sp] ; save the address
|
| 3643 |
|
|
call OREXPR ; get the byte to be POKE'd
|
| 3644 |
|
|
lw r2,[sp] ; get the address back
|
| 3645 |
|
|
sh r1,[r2] ; store the word in memory
|
| 3646 |
|
|
addui sp,sp,#8
|
| 3647 |
|
|
jmp FINISH
|
| 3648 |
|
|
|
| 3649 |
|
|
POKEW:
|
| 3650 |
|
|
subui sp,sp,#8
|
| 3651 |
|
|
call OREXPR ; get the memory address
|
| 3652 |
|
|
setlo r3,#','
|
| 3653 |
|
|
lea r4,PKER ; it must be followed by a comma
|
| 3654 |
|
|
call TSTC
|
| 3655 |
|
|
sw r1,[sp] ; save the address
|
| 3656 |
|
|
call OREXPR ; get the word to be POKE'd
|
| 3657 |
|
|
lw r2,[sp] ; get the address back
|
| 3658 |
|
|
sw r1,[r2] ; store the word in memory
|
| 3659 |
|
|
addui sp,sp,#8
|
| 3660 |
|
|
jmp FINISH
|
| 3661 |
|
|
|
| 3662 |
|
|
SYSX:
|
| 3663 |
|
|
subui sp,sp,#8
|
| 3664 |
|
|
call OREXPR ; get the subroutine's address
|
| 3665 |
|
|
bne r1,r0,sysx1 ; make sure we got a valid address
|
| 3666 |
|
|
lea r1,msgSYSBad
|
| 3667 |
|
|
bra ERROR
|
| 3668 |
|
|
sysx1:
|
| 3669 |
|
|
sw r8,[sp] ; save the text pointer
|
| 3670 |
|
|
jal r31,[r1] ; jump to the subroutine
|
| 3671 |
|
|
lw r8,[sp] ; restore the text pointer
|
| 3672 |
|
|
addui sp,sp,#8
|
| 3673 |
|
|
bra FINISH
|
| 3674 |
|
|
|
| 3675 |
|
|
;******************************************************************
|
| 3676 |
|
|
; *** EXPR ***
|
| 3677 |
|
|
;
|
| 3678 |
|
|
; 'EXPR' evaluates arithmetical or logical expressions.
|
| 3679 |
|
|
; <OREXPR>::= <ANDEXPR> OR <ANDEXPR> ...
|
| 3680 |
|
|
; <ANDEXPR>::=<EXPR> AND <EXPR> ...
|
| 3681 |
|
|
; <EXPR>::=<EXPR2>
|
| 3682 |
|
|
; <EXPR2><rel.op.><EXPR2>
|
| 3683 |
|
|
; where <rel.op.> is one of the operators in TAB8 and the result
|
| 3684 |
|
|
; of these operations is 1 if true and 0 if false.
|
| 3685 |
|
|
; <EXPR2>::=(+ or -)<EXPR3>(+ or -)<EXPR3>(...
|
| 3686 |
|
|
; where () are optional and (... are optional repeats.
|
| 3687 |
|
|
; <EXPR3>::=<EXPR4>( <* or /><EXPR4> )(...
|
| 3688 |
|
|
; <EXPR4>::=<variable>
|
| 3689 |
|
|
; <function>
|
| 3690 |
|
|
; (<EXPR>)
|
| 3691 |
|
|
; <EXPR> is recursive so that the variable '@' can have an <EXPR>
|
| 3692 |
|
|
; as an index, functions can have an <EXPR> as arguments, and
|
| 3693 |
|
|
; <EXPR4> can be an <EXPR> in parenthesis.
|
| 3694 |
|
|
;
|
| 3695 |
|
|
|
| 3696 |
|
|
; <OREXPR>::=<ANDEXPR> OR <ANDEXPR> ...
|
| 3697 |
|
|
;
|
| 3698 |
|
|
OREXPR:
|
| 3699 |
|
|
subui sp,sp,#16
|
| 3700 |
|
|
sw lr,[sp]
|
| 3701 |
|
|
call ANDEXPR ; get first <ANDEXPR>
|
| 3702 |
|
|
XP_OR1:
|
| 3703 |
|
|
sw r1,4[sp] ; save <ANDEXPR> value
|
| 3704 |
|
|
lea r9,TAB10 ; look up a logical operator
|
| 3705 |
|
|
lea r10,TAB10_1
|
| 3706 |
|
|
jmp EXEC ; go do it
|
| 3707 |
|
|
XP_OR:
|
| 3708 |
|
|
call ANDEXPR
|
| 3709 |
|
|
lw r2,8[sp]
|
| 3710 |
|
|
or r1,r1,r2
|
| 3711 |
|
|
bra XP_OR1
|
| 3712 |
|
|
XP_ORX:
|
| 3713 |
|
|
lw r1,8[sp]
|
| 3714 |
|
|
lw lr,[sp]
|
| 3715 |
|
|
ret #16
|
| 3716 |
|
|
|
| 3717 |
|
|
|
| 3718 |
|
|
; <ANDEXPR>::=<EXPR> AND <EXPR> ...
|
| 3719 |
|
|
;
|
| 3720 |
|
|
ANDEXPR:
|
| 3721 |
|
|
subui sp,sp,#16
|
| 3722 |
|
|
sw lr,[sp]
|
| 3723 |
|
|
call EXPR ; get first <EXPR>
|
| 3724 |
|
|
XP_AND1:
|
| 3725 |
|
|
sw r1,8[sp] ; save <EXPR> value
|
| 3726 |
|
|
lea r9,TAB9 ; look up a logical operator
|
| 3727 |
|
|
lea r10,TAB9_1
|
| 3728 |
|
|
jmp EXEC ; go do it
|
| 3729 |
|
|
XP_AND:
|
| 3730 |
|
|
call EXPR
|
| 3731 |
|
|
lw r2,8[sp]
|
| 3732 |
|
|
and r1,r1,r2
|
| 3733 |
|
|
bra XP_AND1
|
| 3734 |
|
|
XP_ANDX:
|
| 3735 |
|
|
lw r1,8[sp]
|
| 3736 |
|
|
lw lr,[sp]
|
| 3737 |
|
|
ret #16
|
| 3738 |
|
|
|
| 3739 |
|
|
|
| 3740 |
|
|
; Determine if the character is a digit
|
| 3741 |
|
|
; Parameters
|
| 3742 |
|
|
; r1 = char to test
|
| 3743 |
|
|
; Returns
|
| 3744 |
|
|
; r1 = 1 if digit, otherwise 0
|
| 3745 |
|
|
;
|
| 3746 |
|
|
isDigit:
|
| 3747 |
|
|
blt r1,#'0',isDigitFalse
|
| 3748 |
|
|
bgt r1,#'9',isDigitFalse
|
| 3749 |
|
|
setlo r1,#1
|
| 3750 |
|
|
ret
|
| 3751 |
|
|
isDigitFalse:
|
| 3752 |
|
|
setlo r1,#0
|
| 3753 |
|
|
ret
|
| 3754 |
|
|
|
| 3755 |
|
|
|
| 3756 |
|
|
; Determine if the character is a alphabetic
|
| 3757 |
|
|
; Parameters
|
| 3758 |
|
|
; r1 = char to test
|
| 3759 |
|
|
; Returns
|
| 3760 |
|
|
; r1 = 1 if alpha, otherwise 0
|
| 3761 |
|
|
;
|
| 3762 |
|
|
isAlpha:
|
| 3763 |
|
|
blt r1,#'A',isAlphaFalse
|
| 3764 |
|
|
ble r1,#'Z',isAlphaTrue
|
| 3765 |
|
|
blt r1,#'a',isAlphaFalse
|
| 3766 |
|
|
bgt r1,#'z',isAlphaFalse
|
| 3767 |
|
|
isAlphaTrue:
|
| 3768 |
|
|
setlo r1,#1
|
| 3769 |
|
|
ret
|
| 3770 |
|
|
isAlphaFalse:
|
| 3771 |
|
|
setlo r1,#0
|
| 3772 |
|
|
ret
|
| 3773 |
|
|
|
| 3774 |
|
|
|
| 3775 |
|
|
; Determine if the character is a alphanumeric
|
| 3776 |
|
|
; Parameters
|
| 3777 |
|
|
; r1 = char to test
|
| 3778 |
|
|
; Returns
|
| 3779 |
|
|
; r1 = 1 if alpha, otherwise 0
|
| 3780 |
|
|
;
|
| 3781 |
|
|
isAlnum:
|
| 3782 |
|
|
subui sp,sp,#8
|
| 3783 |
|
|
sw lr,[sp]
|
| 3784 |
|
|
or r2,r1,r0 ; save test char
|
| 3785 |
|
|
call isDigit
|
| 3786 |
|
|
bne r1,r0,isDigitx ; if it is a digit
|
| 3787 |
|
|
or r1,r2,r0 ; get back test char
|
| 3788 |
|
|
call isAlpha
|
| 3789 |
|
|
isDigitx:
|
| 3790 |
|
|
lw lr,[sp]
|
| 3791 |
|
|
ret #8
|
| 3792 |
|
|
|
| 3793 |
|
|
|
| 3794 |
|
|
EXPR:
|
| 3795 |
|
|
subui sp,sp,#16
|
| 3796 |
|
|
sw lr,[sp]
|
| 3797 |
|
|
call EXPR2
|
| 3798 |
|
|
sw r1,8[sp] ; save <EXPR2> value
|
| 3799 |
|
|
lea r9,TAB8 ; look up a relational operator
|
| 3800 |
|
|
lea r10,TAB8_1
|
| 3801 |
|
|
jmp EXEC ; go do it
|
| 3802 |
|
|
XP11:
|
| 3803 |
|
|
lw r1,8[sp]
|
| 3804 |
|
|
call XP18 ; is it ">="?
|
| 3805 |
|
|
bge r2,r1,XPRT1 ; no, return r2=1
|
| 3806 |
|
|
bra XPRT0 ; else return r2=0
|
| 3807 |
|
|
XP12:
|
| 3808 |
|
|
lw r1,8[sp]
|
| 3809 |
|
|
call XP18 ; is it "<>"?
|
| 3810 |
|
|
bne r2,r1,XPRT1 ; no, return r2=1
|
| 3811 |
|
|
bra XPRT0 ; else return r2=0
|
| 3812 |
|
|
XP13:
|
| 3813 |
|
|
lw r1,8[sp]
|
| 3814 |
|
|
call XP18 ; is it ">"?
|
| 3815 |
|
|
bgt r2,r1,XPRT1 ; no, return r2=1
|
| 3816 |
|
|
bra XPRT0 ; else return r2=0
|
| 3817 |
|
|
XP14:
|
| 3818 |
|
|
lw r1,8[sp]
|
| 3819 |
|
|
call XP18 ; is it "<="?
|
| 3820 |
|
|
ble r2,r1,XPRT1 ; no, return r2=1
|
| 3821 |
|
|
bra XPRT0 ; else return r2=0
|
| 3822 |
|
|
XP15:
|
| 3823 |
|
|
lw r1,8[sp]
|
| 3824 |
|
|
call XP18 ; is it "="?
|
| 3825 |
|
|
beq r2,r1,XPRT1 ; if not, return r2=1
|
| 3826 |
|
|
bra XPRT0 ; else return r2=0
|
| 3827 |
|
|
XP16:
|
| 3828 |
|
|
lw r1,8[sp]
|
| 3829 |
|
|
call XP18 ; is it "<"?
|
| 3830 |
|
|
blt r2,r1,XPRT1 ; if not, return r2=1
|
| 3831 |
|
|
bra XPRT0 ; else return r2=0
|
| 3832 |
|
|
XPRT0:
|
| 3833 |
|
|
lw lr,[sp]
|
| 3834 |
|
|
setlo r1,#0 ; return r1=0 (false)
|
| 3835 |
|
|
ret #16
|
| 3836 |
|
|
XPRT1:
|
| 3837 |
|
|
lw lr,[sp]
|
| 3838 |
|
|
setlo r1,#1 ; return r1=1 (true)
|
| 3839 |
|
|
ret #16
|
| 3840 |
|
|
|
| 3841 |
|
|
XP17: ; it's not a rel. operator
|
| 3842 |
|
|
lw r1,8[sp] ; return r2=<EXPR2>
|
| 3843 |
|
|
lw lr,[sp]
|
| 3844 |
|
|
ret #16
|
| 3845 |
|
|
|
| 3846 |
|
|
XP18:
|
| 3847 |
|
|
subui sp,sp,#16
|
| 3848 |
|
|
sw lr,[sp]
|
| 3849 |
|
|
sw r1,8[sp]
|
| 3850 |
|
|
call EXPR2 ; do a second <EXPR2>
|
| 3851 |
|
|
lw r2,8[sp]
|
| 3852 |
|
|
lw lr,[sp]
|
| 3853 |
|
|
ret #16
|
| 3854 |
|
|
|
| 3855 |
|
|
; <EXPR2>::=(+ or -)<EXPR3>(+ or -)<EXPR3>(...
|
| 3856 |
|
|
|
| 3857 |
|
|
EXPR2:
|
| 3858 |
|
|
subui sp,sp,#16
|
| 3859 |
|
|
sw lr,[sp]
|
| 3860 |
|
|
setlo r3,#'-'
|
| 3861 |
|
|
lea r4,XP21
|
| 3862 |
|
|
call TSTC ; negative sign?
|
| 3863 |
|
|
setlo r1,#0 ; yes, fake '0-'
|
| 3864 |
|
|
sw r0,8[sp]
|
| 3865 |
|
|
bra XP26
|
| 3866 |
|
|
XP21:
|
| 3867 |
|
|
setlo r3,#'+'
|
| 3868 |
|
|
lea r4,XP22
|
| 3869 |
|
|
call TSTC ; positive sign? ignore it
|
| 3870 |
|
|
XP22:
|
| 3871 |
|
|
call EXPR3 ; first <EXPR3>
|
| 3872 |
|
|
XP23:
|
| 3873 |
|
|
sw r1,8[sp] ; yes, save the value
|
| 3874 |
|
|
setlo r3,#'+'
|
| 3875 |
|
|
lea r4,XP25
|
| 3876 |
|
|
call TSTC ; add?
|
| 3877 |
|
|
call EXPR3 ; get the second <EXPR3>
|
| 3878 |
|
|
XP24:
|
| 3879 |
|
|
lw r2,8[sp]
|
| 3880 |
|
|
add r1,r1,r2 ; add it to the first <EXPR3>
|
| 3881 |
|
|
; BVS.L QHOW brnch if there's an overflow
|
| 3882 |
|
|
bra XP23 ; else go back for more operations
|
| 3883 |
|
|
XP25:
|
| 3884 |
|
|
setlo r3,#'-'
|
| 3885 |
|
|
lea r4,XP45
|
| 3886 |
|
|
call TSTC ; subtract?
|
| 3887 |
|
|
XP26:
|
| 3888 |
|
|
call EXPR3 ; get second <EXPR3>
|
| 3889 |
|
|
neg r1,r1 ; change its sign
|
| 3890 |
|
|
bra XP24 ; and do an addition
|
| 3891 |
|
|
XP45:
|
| 3892 |
|
|
lw r1,8[sp]
|
| 3893 |
|
|
lw lr,[sp]
|
| 3894 |
|
|
ret #16
|
| 3895 |
|
|
|
| 3896 |
|
|
|
| 3897 |
|
|
; <EXPR3>::=<EXPR4>( <* or /><EXPR4> )(...
|
| 3898 |
|
|
|
| 3899 |
|
|
EXPR3:
|
| 3900 |
|
|
subui sp,sp,#16
|
| 3901 |
|
|
sw lr,[sp]
|
| 3902 |
|
|
call EXPR4 ; get first <EXPR4>
|
| 3903 |
|
|
XP31:
|
| 3904 |
|
|
sw r1,8[sp] ; yes, save that first result
|
| 3905 |
|
|
setlo r3,#'*'
|
| 3906 |
|
|
lea r4,XP34
|
| 3907 |
|
|
call TSTC ; multiply?
|
| 3908 |
|
|
call EXPR4 ; get second <EXPR4>
|
| 3909 |
|
|
lw r2,8[sp]
|
| 3910 |
|
|
muls r1,r1,r2 ; multiply the two
|
| 3911 |
|
|
bra XP31 ; then look for more terms
|
| 3912 |
|
|
XP34:
|
| 3913 |
|
|
setlo r3,#'/'
|
| 3914 |
|
|
lea r4,XP47
|
| 3915 |
|
|
call TSTC ; divide?
|
| 3916 |
|
|
call EXPR4 ; get second <EXPR4>
|
| 3917 |
|
|
or r2,r1,r0
|
| 3918 |
|
|
lw r1,8[sp]
|
| 3919 |
|
|
divs r1,r1,r2 ; do the division
|
| 3920 |
|
|
bra XP31 ; go back for any more terms
|
| 3921 |
|
|
XP47:
|
| 3922 |
|
|
lw r1,8[sp]
|
| 3923 |
|
|
lw lr,[sp]
|
| 3924 |
|
|
ret #16
|
| 3925 |
|
|
|
| 3926 |
|
|
|
| 3927 |
|
|
; Functions are called through EXPR4
|
| 3928 |
|
|
; <EXPR4>::=<variable>
|
| 3929 |
|
|
; <function>
|
| 3930 |
|
|
; (<EXPR>)
|
| 3931 |
|
|
|
| 3932 |
|
|
EXPR4:
|
| 3933 |
|
|
subui sp,sp,#24
|
| 3934 |
|
|
sw lr,[sp]
|
| 3935 |
|
|
lea r9,TAB4 ; find possible function
|
| 3936 |
|
|
lea r10,TAB4_1
|
| 3937 |
|
|
jmp EXEC ; branch to function which does subsequent ret for EXPR4
|
| 3938 |
|
|
XP40: ; we get here if it wasn't a function
|
| 3939 |
|
|
setlo r1,#0
|
| 3940 |
|
|
call TSTV
|
| 3941 |
|
|
beq r1,r0,XP41 ; nor a variable
|
| 3942 |
|
|
lw r1,[r1] ; if a variable, return its value in r1
|
| 3943 |
|
|
lw lr,[sp]
|
| 3944 |
|
|
ret #24
|
| 3945 |
|
|
XP41:
|
| 3946 |
|
|
call TSTNUM ; or is it a number?
|
| 3947 |
|
|
bne r2,r0,XP46 ; (if not, # of digits will be zero) if so, return it in r1
|
| 3948 |
|
|
call PARN ; check for (EXPR)
|
| 3949 |
|
|
XP46:
|
| 3950 |
|
|
lw lr,[sp]
|
| 3951 |
|
|
ret #24
|
| 3952 |
|
|
|
| 3953 |
|
|
|
| 3954 |
|
|
; Check for a parenthesized expression
|
| 3955 |
|
|
PARN:
|
| 3956 |
|
|
subui sp,sp,#8
|
| 3957 |
|
|
sw lr,[sp]
|
| 3958 |
|
|
setlo r3,#'('
|
| 3959 |
|
|
lea r4,XP43
|
| 3960 |
|
|
call TSTC ; else look for ( OREXPR )
|
| 3961 |
|
|
call OREXPR
|
| 3962 |
|
|
setlo r3,#')'
|
| 3963 |
|
|
lea r4,XP43
|
| 3964 |
|
|
call TSTC
|
| 3965 |
|
|
XP42:
|
| 3966 |
|
|
lw lr,[sp]
|
| 3967 |
|
|
ret #8
|
| 3968 |
|
|
XP43:
|
| 3969 |
|
|
lea r1,msgWhat
|
| 3970 |
|
|
bra ERROR
|
| 3971 |
|
|
|
| 3972 |
|
|
|
| 3973 |
|
|
; ===== Test for a valid variable name. Returns Z=1 if not
|
| 3974 |
|
|
; found, else returns Z=0 and the address of the
|
| 3975 |
|
|
; variable in r1.
|
| 3976 |
|
|
; Parameters
|
| 3977 |
|
|
; r1 = 1 = allocate if not found
|
| 3978 |
|
|
; Returns
|
| 3979 |
|
|
; r1 = address of variable, zero if not found
|
| 3980 |
|
|
|
| 3981 |
|
|
TSTV:
|
| 3982 |
|
|
subui sp,sp,#24
|
| 3983 |
|
|
sw lr,[sp]
|
| 3984 |
|
|
sw r5,8[sp]
|
| 3985 |
|
|
or r5,r1,r0 ; allocate flag
|
| 3986 |
|
|
call IGNBLK
|
| 3987 |
|
|
lbu r1,[r8] ; look at the program text
|
| 3988 |
|
|
blt r1,#'@',tstv_notfound ; C=1: not a variable
|
| 3989 |
|
|
bne r1,#'@',TV1 ; brnch if not "@" array
|
| 3990 |
|
|
addui r8,r8,#1 ; If it is, it should be
|
| 3991 |
|
|
call PARN ; followed by (EXPR) as its index.
|
| 3992 |
|
|
shli r1,r1,#3
|
| 3993 |
|
|
; BCS.L QHOW say "How?" if index is too big
|
| 3994 |
|
|
subui sp,sp,#24
|
| 3995 |
|
|
sw r1,8[sp] ; save the index
|
| 3996 |
|
|
sw lr,[sp]
|
| 3997 |
|
|
call SIZEX ; get amount of free memory
|
| 3998 |
|
|
lw lr,[sp]
|
| 3999 |
|
|
lw r2,8[sp] ; get back the index
|
| 4000 |
|
|
bltu r2,r1,TV2 ; see if there's enough memory
|
| 4001 |
|
|
jmp QSORRY ; if not, say "Sorry"
|
| 4002 |
|
|
TV2:
|
| 4003 |
|
|
lea r1,VARBGN ; put address of array element...
|
| 4004 |
|
|
subu r1,r1,r2 ; into r1 (neg. offset is used)
|
| 4005 |
|
|
bra TSTVRT
|
| 4006 |
|
|
TV1:
|
| 4007 |
|
|
call getVarName ; get variable name
|
| 4008 |
|
|
beq r1,r0,TSTVRT ; if not, return r1=0
|
| 4009 |
|
|
mov r2,r5
|
| 4010 |
|
|
call findVar ; find or allocate
|
| 4011 |
|
|
TSTVRT:
|
| 4012 |
|
|
lw r5,8[sp]
|
| 4013 |
|
|
lw lr,[sp]
|
| 4014 |
|
|
ret #24 ; r1<>0 (found)
|
| 4015 |
|
|
tstv_notfound:
|
| 4016 |
|
|
lw r5,8[sp]
|
| 4017 |
|
|
lw lr,[sp]
|
| 4018 |
|
|
setlo r1,#0 ; r1=0 if not found
|
| 4019 |
|
|
ret #24
|
| 4020 |
|
|
|
| 4021 |
|
|
|
| 4022 |
|
|
; Returns
|
| 4023 |
|
|
; r1 = 6 character variable name + type
|
| 4024 |
|
|
;
|
| 4025 |
|
|
getVarName:
|
| 4026 |
|
|
subui sp,sp,#24
|
| 4027 |
|
|
sw lr,[sp]
|
| 4028 |
|
|
sw r5,16[sp]
|
| 4029 |
|
|
|
| 4030 |
|
|
lb r1,[r8] ; get first character
|
| 4031 |
|
|
sw r1,8[sp] ; save off current name
|
| 4032 |
|
|
call isAlpha
|
| 4033 |
|
|
beq r1,r0,gvn1
|
| 4034 |
|
|
setlo r5,#5 ; loop six more times
|
| 4035 |
|
|
|
| 4036 |
|
|
; check for second/third character
|
| 4037 |
|
|
gvn4:
|
| 4038 |
|
|
addui r8,r8,#1
|
| 4039 |
|
|
lb r1,[r8] ; do we have another char ?
|
| 4040 |
|
|
call isAlnum
|
| 4041 |
|
|
beq r1,r0,gvn2 ; nope
|
| 4042 |
|
|
lw r1,8[sp] ; get varname
|
| 4043 |
|
|
shli r1,r1,#8
|
| 4044 |
|
|
lb r2,[r8]
|
| 4045 |
|
|
or r1,r1,r2 ; add in new char
|
| 4046 |
|
|
sw r1,8[sp] ; save off name again
|
| 4047 |
|
|
loop r5,gvn4
|
| 4048 |
|
|
|
| 4049 |
|
|
; now ignore extra variable name characters
|
| 4050 |
|
|
gvn6:
|
| 4051 |
|
|
addui r8,r8,#1
|
| 4052 |
|
|
lb r1,[r8]
|
| 4053 |
|
|
call isAlnum
|
| 4054 |
|
|
bne r1,r0,gvn6 ; keep looping as long as we have identifier chars
|
| 4055 |
|
|
|
| 4056 |
|
|
; check for a variable type
|
| 4057 |
|
|
gvn2:
|
| 4058 |
|
|
lb r1,[r8]
|
| 4059 |
|
|
beq r1,#'%',gvn3
|
| 4060 |
|
|
beq r1,#'$',gvn3
|
| 4061 |
|
|
setlo r1,#0
|
| 4062 |
|
|
subui r8,r8,#1
|
| 4063 |
|
|
|
| 4064 |
|
|
; insert variable type indicator and return
|
| 4065 |
|
|
gvn3:
|
| 4066 |
|
|
addui r8,r8,#1
|
| 4067 |
|
|
lw r2,8[sp]
|
| 4068 |
|
|
shli r2,r2,#8
|
| 4069 |
|
|
or r1,r1,r2 ; add in variable type
|
| 4070 |
|
|
lw lr,[sp]
|
| 4071 |
|
|
lw r5,16[sp]
|
| 4072 |
|
|
ret #24 ; return Z = 0, r1 = varname
|
| 4073 |
|
|
|
| 4074 |
|
|
; not a variable name
|
| 4075 |
|
|
gvn1:
|
| 4076 |
|
|
lw lr,[sp]
|
| 4077 |
|
|
lw r5,16[sp]
|
| 4078 |
|
|
setlo r1,#0 ; return Z = 1 if not a varname
|
| 4079 |
|
|
ret #24
|
| 4080 |
|
|
|
| 4081 |
|
|
|
| 4082 |
|
|
; Find variable
|
| 4083 |
|
|
; r1 = varname
|
| 4084 |
|
|
; r2 = allocate flag
|
| 4085 |
|
|
; Returns
|
| 4086 |
|
|
; r1 = variable address, Z =0 if found / allocated, Z=1 if not found
|
| 4087 |
|
|
|
| 4088 |
|
|
findVar:
|
| 4089 |
|
|
subui sp,sp,#16
|
| 4090 |
|
|
sw lr,[sp]
|
| 4091 |
|
|
sw r7,8[sp]
|
| 4092 |
|
|
lw r3,VARBGN
|
| 4093 |
|
|
fv4:
|
| 4094 |
|
|
lw r7,[r3] ; get varname / type
|
| 4095 |
|
|
beq r7,r0,fv3 ; no more vars ?
|
| 4096 |
|
|
beq r1,r7,fv1 ; match ?
|
| 4097 |
|
|
add r3,r3,#8 ; move to next var
|
| 4098 |
|
|
lw r7,STKBOT
|
| 4099 |
|
|
blt r3,r7,fv4 ; loop back to look at next var
|
| 4100 |
|
|
|
| 4101 |
|
|
; variable not found
|
| 4102 |
|
|
; no more memory
|
| 4103 |
|
|
setlo r1,#<msgVarSpace
|
| 4104 |
|
|
sethi r1,#>msgVarSpace
|
| 4105 |
|
|
bra ERROR
|
| 4106 |
|
|
; lw lr,[sp]
|
| 4107 |
|
|
; lw r7,4[sp]
|
| 4108 |
|
|
; add sp,sp,#8
|
| 4109 |
|
|
; lw r1,#0
|
| 4110 |
|
|
; ret
|
| 4111 |
|
|
|
| 4112 |
|
|
; variable not found
|
| 4113 |
|
|
; allocate new ?
|
| 4114 |
|
|
fv3:
|
| 4115 |
|
|
beq r2,r0,fv2
|
| 4116 |
|
|
sw r1,[r3] ; save varname / type
|
| 4117 |
|
|
; found variable
|
| 4118 |
|
|
; return address
|
| 4119 |
|
|
fv1:
|
| 4120 |
|
|
addui r1,r3,#8
|
| 4121 |
|
|
lw lr,[sp]
|
| 4122 |
|
|
lw r7,8[sp]
|
| 4123 |
|
|
ret #16 ; Z = 0, r1 = address
|
| 4124 |
|
|
|
| 4125 |
|
|
; didn't find var and not allocating
|
| 4126 |
|
|
fv2:
|
| 4127 |
|
|
lw lr,[sp]
|
| 4128 |
|
|
lw r7,8[sp]
|
| 4129 |
|
|
addui sp,sp,#16 ; Z = 0, r1 = address
|
| 4130 |
|
|
setlo r1,#0 ; Z = 1, r1 = 0
|
| 4131 |
|
|
ret
|
| 4132 |
|
|
|
| 4133 |
|
|
|
| 4134 |
|
|
; ===== Multiplies the 32 bit values in r1 and r2, returning
|
| 4135 |
|
|
; the 32 bit result in r1.
|
| 4136 |
|
|
;
|
| 4137 |
|
|
|
| 4138 |
|
|
; ===== Divide the 32 bit value in r2 by the 32 bit value in r3.
|
| 4139 |
|
|
; Returns the 32 bit quotient in r1, remainder in r2
|
| 4140 |
|
|
;
|
| 4141 |
|
|
; r2 = a
|
| 4142 |
|
|
; r3 = b
|
| 4143 |
|
|
; r6 = remainder
|
| 4144 |
|
|
; r7 = iteration count
|
| 4145 |
|
|
; r8 = sign
|
| 4146 |
|
|
;
|
| 4147 |
|
|
|
| 4148 |
|
|
; q = a / b
|
| 4149 |
|
|
; a = r1
|
| 4150 |
|
|
; b = r2
|
| 4151 |
|
|
; q = r2
|
| 4152 |
|
|
|
| 4153 |
|
|
|
| 4154 |
|
|
; ===== The PEEK function returns the byte stored at the address
|
| 4155 |
|
|
; contained in the following expression.
|
| 4156 |
|
|
;
|
| 4157 |
|
|
PEEK:
|
| 4158 |
|
|
call PARN ; get the memory address
|
| 4159 |
|
|
lbu r1,[r1] ; get the addressed byte
|
| 4160 |
|
|
lw lr,[sp] ; and return it
|
| 4161 |
|
|
ret #24
|
| 4162 |
|
|
|
| 4163 |
|
|
; ===== The PEEK function returns the byte stored at the address
|
| 4164 |
|
|
; contained in the following expression.
|
| 4165 |
|
|
;
|
| 4166 |
|
|
PEEKC:
|
| 4167 |
|
|
call PARN ; get the memory address
|
| 4168 |
|
|
andi r1,r1,#-2 ; align to char address
|
| 4169 |
|
|
lcu r1,[r1] ; get the addressed char
|
| 4170 |
|
|
lw lr,[sp] ; and return it
|
| 4171 |
|
|
ret #24
|
| 4172 |
|
|
|
| 4173 |
|
|
; ===== The PEEK function returns the byte stored at the address
|
| 4174 |
|
|
; contained in the following expression.
|
| 4175 |
|
|
;
|
| 4176 |
|
|
PEEKH:
|
| 4177 |
|
|
call PARN ; get the memory address
|
| 4178 |
|
|
andi r1,r1,#-4 ; align to half-word address
|
| 4179 |
|
|
lhu r1,[r1] ; get the addressed char
|
| 4180 |
|
|
lw lr,[sp] ; and return it
|
| 4181 |
|
|
ret #24
|
| 4182 |
|
|
|
| 4183 |
|
|
; ===== The PEEK function returns the byte stored at the address
|
| 4184 |
|
|
; contained in the following expression.
|
| 4185 |
|
|
;
|
| 4186 |
|
|
PEEKW:
|
| 4187 |
|
|
call PARN ; get the memory address
|
| 4188 |
|
|
andi r1,r1,#-8 ; align to word address
|
| 4189 |
|
|
lw r1,[r1] ; get the addressed word
|
| 4190 |
|
|
lw lr,[sp] ; and return it
|
| 4191 |
|
|
ret #24
|
| 4192 |
|
|
|
| 4193 |
|
|
; user function call
|
| 4194 |
|
|
; call the user function with argument in r1
|
| 4195 |
|
|
USRX:
|
| 4196 |
|
|
call PARN ; get expression value
|
| 4197 |
|
|
sw r8,8[sp] ; save the text pointer
|
| 4198 |
|
|
lw r2,usrJmp ; get usr vector
|
| 4199 |
|
|
jal r31,[r2] ; jump to the subroutine
|
| 4200 |
|
|
lw r8,8[sp] ; restore the text pointer
|
| 4201 |
|
|
lw lr,[sp]
|
| 4202 |
|
|
ret #24
|
| 4203 |
|
|
|
| 4204 |
|
|
|
| 4205 |
|
|
; ===== The RND function returns a random number from 1 to
|
| 4206 |
|
|
; the value of the following expression in D0.
|
| 4207 |
|
|
;
|
| 4208 |
|
|
RND:
|
| 4209 |
|
|
call PARN ; get the upper limit
|
| 4210 |
|
|
beq r1,r0,rnd2 ; it must be positive and non-zero
|
| 4211 |
|
|
blt r1,r0,rnd1
|
| 4212 |
|
|
lw r2,r1
|
| 4213 |
|
|
gran ; generate a random number
|
| 4214 |
|
|
mfspr r1,rand ; get the number
|
| 4215 |
|
|
call modu4 ; RND(n)=MOD(number,n)+1
|
| 4216 |
|
|
addui r1,r1,#1
|
| 4217 |
|
|
lw lr,[sp]
|
| 4218 |
|
|
ret #24
|
| 4219 |
|
|
rnd1:
|
| 4220 |
|
|
lea r1,msgRNDBad
|
| 4221 |
|
|
bra ERROR
|
| 4222 |
|
|
rnd2:
|
| 4223 |
|
|
gran
|
| 4224 |
|
|
mfspr r1,rand
|
| 4225 |
|
|
lw lr,[sp]
|
| 4226 |
|
|
ret #24
|
| 4227 |
|
|
|
| 4228 |
|
|
|
| 4229 |
|
|
; r = a mod b
|
| 4230 |
|
|
; a = r1
|
| 4231 |
|
|
; b = r2
|
| 4232 |
|
|
; r = r6
|
| 4233 |
|
|
modu4:
|
| 4234 |
|
|
subui sp,sp,#32
|
| 4235 |
|
|
sw r3,[sp]
|
| 4236 |
|
|
sw r5,8[sp]
|
| 4237 |
|
|
sw r6,16[sp]
|
| 4238 |
|
|
sw r7,24[sp]
|
| 4239 |
|
|
lw r7,#63 ; n = 64
|
| 4240 |
|
|
xor r5,r5,r5 ; w = 0
|
| 4241 |
|
|
xor r6,r6,r6 ; r = 0
|
| 4242 |
|
|
mod2:
|
| 4243 |
|
|
roli r1,r1,#1 ; a <<= 1
|
| 4244 |
|
|
andi r3,r1,#1
|
| 4245 |
|
|
shli r6,r6,#1 ; r <<= 1
|
| 4246 |
|
|
or r6,r6,r3
|
| 4247 |
|
|
andi r1,r1,#-2
|
| 4248 |
|
|
bgtu r2,r6,mod1 ; b < r ?
|
| 4249 |
|
|
subu r6,r6,r2 ; r -= b
|
| 4250 |
|
|
mod1:
|
| 4251 |
|
|
loop r7,mod2 ; n--
|
| 4252 |
|
|
mov r1,r6
|
| 4253 |
|
|
lw r3,[sp]
|
| 4254 |
|
|
lw r5,8[sp]
|
| 4255 |
|
|
lw r6,16[sp]
|
| 4256 |
|
|
lw r7,24[sp]
|
| 4257 |
|
|
ret #32
|
| 4258 |
|
|
|
| 4259 |
|
|
|
| 4260 |
|
|
; ===== The ABS function returns an absolute value in r2.
|
| 4261 |
|
|
;
|
| 4262 |
|
|
ABS:
|
| 4263 |
|
|
call PARN ; get the following expr.'s value
|
| 4264 |
|
|
abs r1,r1
|
| 4265 |
|
|
lw lr,[sp]
|
| 4266 |
|
|
ret #24
|
| 4267 |
|
|
|
| 4268 |
|
|
; ===== The SGN function returns the sign in r1. +1,0, or -1
|
| 4269 |
|
|
;
|
| 4270 |
|
|
SGN:
|
| 4271 |
|
|
call PARN ; get the following expr.'s value
|
| 4272 |
|
|
sgn r1,r1
|
| 4273 |
|
|
lw lr,[sp]
|
| 4274 |
|
|
ret #24
|
| 4275 |
|
|
|
| 4276 |
|
|
; ===== The SIZE function returns the size of free memory in r1.
|
| 4277 |
|
|
;
|
| 4278 |
|
|
SIZEX:
|
| 4279 |
|
|
lw r1,VARBGN ; get the number of free bytes...
|
| 4280 |
|
|
lw r2,TXTUNF ; between 'TXTUNF' and 'VARBGN'
|
| 4281 |
|
|
subu r1,r1,r2
|
| 4282 |
|
|
lw lr,[sp]
|
| 4283 |
|
|
ret #24 ; return the number in r2
|
| 4284 |
|
|
|
| 4285 |
|
|
|
| 4286 |
|
|
;******************************************************************
|
| 4287 |
|
|
;
|
| 4288 |
|
|
; *** SETVAL *** FIN *** ENDCHK *** ERROR (& friends) ***
|
| 4289 |
|
|
;
|
| 4290 |
|
|
; 'SETVAL' expects a variable, followed by an equal sign and then
|
| 4291 |
|
|
; an expression. It evaluates the expression and sets the variable
|
| 4292 |
|
|
; to that value.
|
| 4293 |
|
|
;
|
| 4294 |
|
|
; 'FIN' checks the end of a command. If it ended with ":",
|
| 4295 |
|
|
; execution continues. If it ended with a CR, it finds the
|
| 4296 |
|
|
; the next line and continues from there.
|
| 4297 |
|
|
;
|
| 4298 |
|
|
; 'ENDCHK' checks if a command is ended with a CR. This is
|
| 4299 |
|
|
; required in certain commands, such as GOTO, RETURN, STOP, etc.
|
| 4300 |
|
|
;
|
| 4301 |
|
|
; 'ERROR' prints the string pointed to by r1. It then prints the
|
| 4302 |
|
|
; line pointed to by CURRNT with a "?" inserted at where the
|
| 4303 |
|
|
; old text pointer (should be on top of the stack) points to.
|
| 4304 |
|
|
; Execution of Tiny BASIC is stopped and a warm start is done.
|
| 4305 |
|
|
; If CURRNT is zero (indicating a direct command), the direct
|
| 4306 |
|
|
; command is not printed. If CURRNT is -1 (indicating
|
| 4307 |
|
|
; 'INPUT' command in progress), the input line is not printed
|
| 4308 |
|
|
; and execution is not terminated but continues at 'INPERR'.
|
| 4309 |
|
|
;
|
| 4310 |
|
|
; Related to 'ERROR' are the following:
|
| 4311 |
|
|
; 'QWHAT' saves text pointer on stack and gets "What?" message.
|
| 4312 |
|
|
; 'AWHAT' just gets the "What?" message and jumps to 'ERROR'.
|
| 4313 |
|
|
; 'QSORRY' and 'ASORRY' do the same kind of thing.
|
| 4314 |
|
|
; 'QHOW' and 'AHOW' also do this for "How?".
|
| 4315 |
|
|
;
|
| 4316 |
|
|
|
| 4317 |
|
|
; returns
|
| 4318 |
|
|
; r2 = variable's address
|
| 4319 |
|
|
;
|
| 4320 |
|
|
SETVAL:
|
| 4321 |
|
|
subui sp,sp,#16
|
| 4322 |
|
|
sw lr,[sp]
|
| 4323 |
|
|
setlo r1,#1 ; allocate var
|
| 4324 |
|
|
call TSTV ; variable name?
|
| 4325 |
|
|
bne r1,r0,sv2
|
| 4326 |
|
|
lea r1,msgVar
|
| 4327 |
|
|
bra ERROR
|
| 4328 |
|
|
sv2:
|
| 4329 |
|
|
sw r1,8[sp] ; save the variable's address
|
| 4330 |
|
|
setlo r3,#'='
|
| 4331 |
|
|
lea r4,SV1
|
| 4332 |
|
|
call TSTC ; get past the "=" sign
|
| 4333 |
|
|
call OREXPR ; evaluate the expression
|
| 4334 |
|
|
lw r2,8[sp] ; get back the variable's address
|
| 4335 |
|
|
sw r1,[r2] ; and save value in the variable
|
| 4336 |
|
|
lw r1,r2 ; return r1 = variable address
|
| 4337 |
|
|
lw lr,[sp]
|
| 4338 |
|
|
ret #16
|
| 4339 |
|
|
SV1:
|
| 4340 |
|
|
bra QWHAT ; if no "=" sign
|
| 4341 |
|
|
|
| 4342 |
|
|
|
| 4343 |
|
|
FIN:
|
| 4344 |
|
|
subui sp,sp,#8
|
| 4345 |
|
|
sw lr,[sp]
|
| 4346 |
|
|
setlo r3,#':'
|
| 4347 |
|
|
lea r4,FI1
|
| 4348 |
|
|
call TSTC ; *** FIN ***
|
| 4349 |
|
|
addui sp,sp,#8 ; if ":", discard return address
|
| 4350 |
|
|
bra RUNSML ; continue on the same line
|
| 4351 |
|
|
FI1:
|
| 4352 |
|
|
setlo r3,#CR
|
| 4353 |
|
|
lea r4,FI2
|
| 4354 |
|
|
call TSTC ; not ":", is it a CR?
|
| 4355 |
|
|
lw lr,[sp] ; else return to the caller
|
| 4356 |
|
|
addui sp,sp,#8 ; yes, purge return address
|
| 4357 |
|
|
bra RUNNXL ; execute the next line
|
| 4358 |
|
|
FI2:
|
| 4359 |
|
|
lw lr,[sp] ; else return to the caller
|
| 4360 |
|
|
ret #8
|
| 4361 |
|
|
|
| 4362 |
|
|
|
| 4363 |
|
|
; Check that there is nothing else on the line
|
| 4364 |
|
|
; Registers Affected
|
| 4365 |
|
|
; r1
|
| 4366 |
|
|
;
|
| 4367 |
|
|
ENDCHK:
|
| 4368 |
|
|
subui sp,sp,#8
|
| 4369 |
|
|
sw lr,[sp]
|
| 4370 |
|
|
call IGNBLK
|
| 4371 |
|
|
lb r1,[r8]
|
| 4372 |
|
|
beq r1,#CR,ec1 ; does it end with a CR?
|
| 4373 |
|
|
setlo r1,#<msgExtraChars
|
| 4374 |
|
|
sethi r1,#>msgExtraChars
|
| 4375 |
|
|
jmp ERROR
|
| 4376 |
|
|
ec1:
|
| 4377 |
|
|
lw lr,[sp]
|
| 4378 |
|
|
ret #8
|
| 4379 |
|
|
|
| 4380 |
|
|
|
| 4381 |
|
|
TOOBIG:
|
| 4382 |
|
|
lea r1,msgTooBig
|
| 4383 |
|
|
bra ERROR
|
| 4384 |
|
|
QSORRY:
|
| 4385 |
|
|
lea r1,SRYMSG
|
| 4386 |
|
|
bra ERROR
|
| 4387 |
|
|
QWHAT:
|
| 4388 |
|
|
lea r1,msgWhat
|
| 4389 |
|
|
ERROR:
|
| 4390 |
|
|
call PRMESG ; display the error message
|
| 4391 |
|
|
lw r1,CURRNT ; get the current line number
|
| 4392 |
|
|
beq r1,r0,WSTART ; if zero, do a warm start
|
| 4393 |
|
|
beq r1,#-1,INPERR ; is the line no. pointer = -1? if so, redo input
|
| 4394 |
|
|
lb r5,[r8] ; save the char. pointed to
|
| 4395 |
|
|
sb r0,[r8] ; put a zero where the error is
|
| 4396 |
|
|
lw r1,CURRNT ; point to start of current line
|
| 4397 |
|
|
call PRTLN ; display the line in error up to the 0
|
| 4398 |
|
|
or r6,r1,r0 ; save off end pointer
|
| 4399 |
|
|
sb r5,[r8] ; restore the character
|
| 4400 |
|
|
setlo r1,#'?' ; display a "?"
|
| 4401 |
|
|
call GOOUT
|
| 4402 |
|
|
setlo r2,#0 ; stop char = 0
|
| 4403 |
|
|
subui r1,r6,#1 ; point back to the error char.
|
| 4404 |
|
|
call PRTSTG ; display the rest of the line
|
| 4405 |
|
|
jmp WSTART ; and do a warm start
|
| 4406 |
|
|
|
| 4407 |
|
|
;******************************************************************
|
| 4408 |
|
|
;
|
| 4409 |
|
|
; *** GETLN *** FNDLN (& friends) ***
|
| 4410 |
|
|
;
|
| 4411 |
|
|
; 'GETLN' reads in input line into 'BUFFER'. It first prompts with
|
| 4412 |
|
|
; the character in r3 (given by the caller), then it fills the
|
| 4413 |
|
|
; buffer and echos. It ignores LF's but still echos
|
| 4414 |
|
|
; them back. Control-H is used to delete the last character
|
| 4415 |
|
|
; entered (if there is one), and control-X is used to delete the
|
| 4416 |
|
|
; whole line and start over again. CR signals the end of a line,
|
| 4417 |
|
|
; and causes 'GETLN' to return.
|
| 4418 |
|
|
;
|
| 4419 |
|
|
;
|
| 4420 |
|
|
GETLN:
|
| 4421 |
|
|
subui sp,sp,#16
|
| 4422 |
|
|
sw lr,[sp]
|
| 4423 |
|
|
sw r5,8[sp]
|
| 4424 |
|
|
call GOOUT ; display the prompt
|
| 4425 |
|
|
setlo r1,#1 ; turn on cursor flash
|
| 4426 |
|
|
sb r1,cursFlash
|
| 4427 |
|
|
setlo r1,#' ' ; and a space
|
| 4428 |
|
|
call GOOUT
|
| 4429 |
|
|
setlo r8,#<BUFFER ; r8 is the buffer pointer
|
| 4430 |
|
|
sethi r8,#>BUFFER
|
| 4431 |
|
|
GL1:
|
| 4432 |
|
|
call CHKIO ; check keyboard
|
| 4433 |
|
|
beq r1,r0,GL1 ; wait for a char. to come in
|
| 4434 |
|
|
beq r1,#CTRLH,GL3 ; delete last character? if so
|
| 4435 |
|
|
beq r1,#CTRLX,GL4 ; delete the whole line?
|
| 4436 |
|
|
beq r1,#CR,GL2 ; accept a CR
|
| 4437 |
|
|
bltu r1,#' ',GL1 ; if other control char., discard it
|
| 4438 |
|
|
GL2:
|
| 4439 |
|
|
sb r1,[r8] ; save the char.
|
| 4440 |
|
|
add r8,r8,#1
|
| 4441 |
|
|
call GOOUT ; echo the char back out
|
| 4442 |
|
|
lb r1,-1[r8] ; get char back (GOOUT destroys r1)
|
| 4443 |
|
|
beq r1,#CR,GL7 ; if it's a CR, end the line
|
| 4444 |
|
|
cmpui r1,r8,#BUFFER+BUFLEN-1 ; any more room?
|
| 4445 |
|
|
blt r1,r0,GL1 ; yes: get some more, else delete last char.
|
| 4446 |
|
|
GL3:
|
| 4447 |
|
|
setlo r1,#CTRLH ; delete a char. if possible
|
| 4448 |
|
|
call GOOUT
|
| 4449 |
|
|
setlo r1,#' '
|
| 4450 |
|
|
call GOOUT
|
| 4451 |
|
|
cmpui r1,r8,#BUFFER ; any char.'s left?
|
| 4452 |
|
|
ble r1,r0,GL1 ; if not
|
| 4453 |
|
|
setlo r1,#CTRLH ; if so, finish the BS-space-BS sequence
|
| 4454 |
|
|
call GOOUT
|
| 4455 |
|
|
sub r8,r8,#1 ; decrement the text pointer
|
| 4456 |
|
|
bra GL1 ; back for more
|
| 4457 |
|
|
GL4:
|
| 4458 |
|
|
or r1,r8,r0 ; delete the whole line
|
| 4459 |
|
|
subui r5,r1,#BUFFER ; figure out how many backspaces we need
|
| 4460 |
|
|
beq r5,r0,GL6 ; if none needed, brnch
|
| 4461 |
|
|
GL5:
|
| 4462 |
|
|
setlo r1,#CTRLH ; and display BS-space-BS sequences
|
| 4463 |
|
|
call GOOUT
|
| 4464 |
|
|
setlo r1,#' '
|
| 4465 |
|
|
call GOOUT
|
| 4466 |
|
|
setlo r1,#CTRLH
|
| 4467 |
|
|
call GOOUT
|
| 4468 |
|
|
loop r5,GL5
|
| 4469 |
|
|
GL6:
|
| 4470 |
|
|
lea r8,BUFFER ; reinitialize the text pointer
|
| 4471 |
|
|
bra GL1 ; and go back for more
|
| 4472 |
|
|
GL7:
|
| 4473 |
|
|
setlo r1,#0 ; turn off cursor flash
|
| 4474 |
|
|
sb r1,cursFlash
|
| 4475 |
|
|
setlo r1,#LF ; echo a LF for the CR
|
| 4476 |
|
|
call GOOUT
|
| 4477 |
|
|
lw lr,[sp]
|
| 4478 |
|
|
lw r5,8[sp]
|
| 4479 |
|
|
ret #16
|
| 4480 |
|
|
|
| 4481 |
|
|
|
| 4482 |
|
|
; 'FNDLN' finds a line with a given line no. (in r1) in the
|
| 4483 |
|
|
; text save area. r9 is used as the text pointer. If the line
|
| 4484 |
|
|
; is found, r9 will point to the beginning of that line
|
| 4485 |
|
|
; (i.e. the high byte of the line no.), and flags are Z.
|
| 4486 |
|
|
; If that line is not there and a line with a higher line no.
|
| 4487 |
|
|
; is found, r9 points there and flags are NC & NZ. If we reached
|
| 4488 |
|
|
; the end of the text save area and cannot find the line, flags
|
| 4489 |
|
|
; are C & NZ.
|
| 4490 |
|
|
; Z=1 if line found
|
| 4491 |
|
|
; N=1 if end of text save area
|
| 4492 |
|
|
; Z=0 & N=0 if higher line found
|
| 4493 |
|
|
; r0 = 1 <= line is found
|
| 4494 |
|
|
; r9 = pointer to line
|
| 4495 |
|
|
; r0 = 0 <= line is not found
|
| 4496 |
|
|
; r9 = zero, if end of text area
|
| 4497 |
|
|
; r9 = otherwise higher line number
|
| 4498 |
|
|
;
|
| 4499 |
|
|
; 'FNDLN' will initialize r9 to the beginning of the text save
|
| 4500 |
|
|
; area to start the search. Some other entries of this routine
|
| 4501 |
|
|
; will not initialize r9 and do the search.
|
| 4502 |
|
|
; 'FNDLNP' will start with r9 and search for the line no.
|
| 4503 |
|
|
; 'FNDNXT' will bump r9 by 2, find a CR and then start search.
|
| 4504 |
|
|
; 'FNDSKP' uses r9 to find a CR, and then starts the search.
|
| 4505 |
|
|
; return Z=1 if line is found, r9 = pointer to line
|
| 4506 |
|
|
;
|
| 4507 |
|
|
; Parameters
|
| 4508 |
|
|
; r1 = line number to find
|
| 4509 |
|
|
;
|
| 4510 |
|
|
FNDLN:
|
| 4511 |
|
|
bleui r1,#0xFFFF,fl1 ; line no. must be < 65535
|
| 4512 |
|
|
lea r1,msgLineRange
|
| 4513 |
|
|
bra ERROR
|
| 4514 |
|
|
fl1:
|
| 4515 |
|
|
lw r9,TXTBGN ; init. the text save pointer
|
| 4516 |
|
|
|
| 4517 |
|
|
FNDLNP:
|
| 4518 |
|
|
lw r10,TXTUNF ; check if we passed the end
|
| 4519 |
|
|
subui r10,r10,#1
|
| 4520 |
|
|
bgtu r9,r10,FNDRET1 ; if so, return with r9=0,r1=0
|
| 4521 |
|
|
lbu r3,[r9] ; get low order byte of line number
|
| 4522 |
|
|
lbu r2,1[r9] ; get high order byte
|
| 4523 |
|
|
shli r2,r2,#8
|
| 4524 |
|
|
or r2,r2,r3 ; build whole line number
|
| 4525 |
|
|
bgtu r1,r2,FNDNXT ; is this the line we want? no, not there yet
|
| 4526 |
|
|
beq r1,r2,FNDRET2
|
| 4527 |
|
|
FNDRET:
|
| 4528 |
|
|
xor r1,r1,r1 ; line not found, but r9=next line pointer
|
| 4529 |
|
|
ret ; return the cond. codes
|
| 4530 |
|
|
FNDRET1:
|
| 4531 |
|
|
xor r9,r9,r9 ; no higher line
|
| 4532 |
|
|
xor r1,r1,r1 ; line not found
|
| 4533 |
|
|
ret
|
| 4534 |
|
|
FNDRET2:
|
| 4535 |
|
|
setlo r1,#1 ; line found
|
| 4536 |
|
|
ret
|
| 4537 |
|
|
|
| 4538 |
|
|
FNDNXT:
|
| 4539 |
|
|
addui r9,r9,#2 ; find the next line
|
| 4540 |
|
|
|
| 4541 |
|
|
FNDSKP:
|
| 4542 |
|
|
lbu r2,[r9]
|
| 4543 |
|
|
addui r9,r9,#1
|
| 4544 |
|
|
bnei r2,#CR,FNDSKP ; try to find a CR, keep looking
|
| 4545 |
|
|
bra FNDLNP ; check if end of text
|
| 4546 |
|
|
|
| 4547 |
|
|
|
| 4548 |
|
|
;******************************************************************
|
| 4549 |
|
|
; 'MVUP' moves a block up from where r1 points to where r2 points
|
| 4550 |
|
|
; until r1=r3
|
| 4551 |
|
|
;
|
| 4552 |
|
|
MVUP1:
|
| 4553 |
|
|
lb r4,[r1]
|
| 4554 |
|
|
sb r4,[r2]
|
| 4555 |
|
|
add r1,r1,#1
|
| 4556 |
|
|
add r2,r2,#1
|
| 4557 |
|
|
MVUP:
|
| 4558 |
|
|
bne r1,r3,MVUP1
|
| 4559 |
|
|
MVRET:
|
| 4560 |
|
|
ret
|
| 4561 |
|
|
|
| 4562 |
|
|
|
| 4563 |
|
|
; 'MVDOWN' moves a block down from where r1 points to where r2
|
| 4564 |
|
|
; points until r1=r3
|
| 4565 |
|
|
;
|
| 4566 |
|
|
MVDOWN1:
|
| 4567 |
|
|
sub r1,r1,#1
|
| 4568 |
|
|
sub r2,r2,#1
|
| 4569 |
|
|
lb r4,[r1]
|
| 4570 |
|
|
sb r4,[r2]
|
| 4571 |
|
|
MVDOWN:
|
| 4572 |
|
|
bne r1,r3,MVDOWN1
|
| 4573 |
|
|
ret
|
| 4574 |
|
|
|
| 4575 |
|
|
|
| 4576 |
|
|
; 'POPA' restores the 'FOR' loop variable save area from the stack
|
| 4577 |
|
|
;
|
| 4578 |
|
|
; 'PUSHA' stacks for 'FOR' loop variable save area onto the stack
|
| 4579 |
|
|
;
|
| 4580 |
|
|
; Note: a single zero word is stored on the stack in the
|
| 4581 |
|
|
; case that no FOR loops need to be saved. This needs to be
|
| 4582 |
|
|
; done because PUSHA / POPA is called all the time.
|
| 4583 |
|
|
|
| 4584 |
|
|
POPA:
|
| 4585 |
|
|
lw r1,[sp] ; restore LOPVAR, but zero means no more
|
| 4586 |
|
|
sw r1,LOPVAR
|
| 4587 |
|
|
beq r1,r0,PP1
|
| 4588 |
|
|
lw r1,32[sp] ; if not zero, restore the rest
|
| 4589 |
|
|
sw r1,LOPPT
|
| 4590 |
|
|
lw r1,24[sp]
|
| 4591 |
|
|
sw r1,LOPLN
|
| 4592 |
|
|
lw r1,16[sp]
|
| 4593 |
|
|
sw r1,LOPLMT
|
| 4594 |
|
|
lw r1,8[sp]
|
| 4595 |
|
|
sw r1,LOPINC
|
| 4596 |
|
|
ret #40
|
| 4597 |
|
|
PP1:
|
| 4598 |
|
|
ret #8
|
| 4599 |
|
|
|
| 4600 |
|
|
|
| 4601 |
|
|
PUSHA:
|
| 4602 |
|
|
lw r1,STKBOT ; Are we running out of stack room?
|
| 4603 |
|
|
addui r1,r1,#40 ; we might need this many bytes
|
| 4604 |
|
|
bltu sp,r1,QSORRY ; out of stack space
|
| 4605 |
|
|
lw r1,LOPVAR ; save loop variables
|
| 4606 |
|
|
beq r1,r0,PU1 ; if LOPVAR is zero, that's all
|
| 4607 |
|
|
subui sp,sp,#40
|
| 4608 |
|
|
sw r1,[sp]
|
| 4609 |
|
|
lw r1,LOPPT
|
| 4610 |
|
|
sw r1,32[sp] ; else save all the others
|
| 4611 |
|
|
lw r1,LOPLN
|
| 4612 |
|
|
sw r1,24[sp]
|
| 4613 |
|
|
lw r1,LOPLMT
|
| 4614 |
|
|
sw r1,16[sp]
|
| 4615 |
|
|
lw r1,LOPINC
|
| 4616 |
|
|
sw r1,8[sp]
|
| 4617 |
|
|
ret
|
| 4618 |
|
|
PU1:
|
| 4619 |
|
|
subui sp,sp,#8
|
| 4620 |
|
|
sw r1,[sp]
|
| 4621 |
|
|
ret
|
| 4622 |
|
|
|
| 4623 |
|
|
|
| 4624 |
|
|
;******************************************************************
|
| 4625 |
|
|
;
|
| 4626 |
|
|
; *** PRTSTG *** QTSTG *** PRTNUM *** PRTLN ***
|
| 4627 |
|
|
;
|
| 4628 |
|
|
; 'PRTSTG' prints a string pointed to by r3. It stops printing
|
| 4629 |
|
|
; and returns to the caller when either a CR is printed or when
|
| 4630 |
|
|
; the next byte is the same as what was passed in r4 by the
|
| 4631 |
|
|
; caller.
|
| 4632 |
|
|
;
|
| 4633 |
|
|
; 'QTSTG' looks for an underline (back-arrow on some systems),
|
| 4634 |
|
|
; single-quote, or double-quote. If none of these are found, returns
|
| 4635 |
|
|
; to the caller. If underline, outputs a CR without a LF. If single
|
| 4636 |
|
|
; or double quote, prints the quoted string and demands a matching
|
| 4637 |
|
|
; end quote. After the printing, the next i-word of the caller is
|
| 4638 |
|
|
; skipped over (usually a branch instruction).
|
| 4639 |
|
|
;
|
| 4640 |
|
|
; 'PRTNUM' prints the 32 bit number in r3, leading blanks are added if
|
| 4641 |
|
|
; needed to pad the number of spaces to the number in r4.
|
| 4642 |
|
|
; However, if the number of digits is larger than the no. in
|
| 4643 |
|
|
; r4, all digits are printed anyway. Negative sign is also
|
| 4644 |
|
|
; printed and counted in, positive sign is not.
|
| 4645 |
|
|
;
|
| 4646 |
|
|
; 'PRTLN' prints the saved text line pointed to by r3
|
| 4647 |
|
|
; with line no. and all.
|
| 4648 |
|
|
;
|
| 4649 |
|
|
|
| 4650 |
|
|
; r1 = pointer to string
|
| 4651 |
|
|
; r2 = stop character
|
| 4652 |
|
|
; return r1 = pointer to end of line + 1
|
| 4653 |
|
|
|
| 4654 |
|
|
PRTSTG:
|
| 4655 |
|
|
sub sp,sp,#32
|
| 4656 |
|
|
sw r5,[sp]
|
| 4657 |
|
|
sw r5,8[sp]
|
| 4658 |
|
|
sw r7,16[sp]
|
| 4659 |
|
|
sw lr,24[sp]
|
| 4660 |
|
|
mov r5,r1 ; r5 = pointer
|
| 4661 |
|
|
mov r6,r2 ; r6 = stop char
|
| 4662 |
|
|
PS1:
|
| 4663 |
|
|
lbu r7,[r5] ; get a text character
|
| 4664 |
|
|
addui r5,r5,#1
|
| 4665 |
|
|
beq r7,r6,PRTRET ; same as stop character? if so, return
|
| 4666 |
|
|
mov r1,r7
|
| 4667 |
|
|
call GOOUT ; display the char.
|
| 4668 |
|
|
bnei r7,#CR,PS1 ; is it a C.R.? no, go back for more
|
| 4669 |
|
|
setlo r1,#LF ; yes, add a L.F.
|
| 4670 |
|
|
call GOOUT
|
| 4671 |
|
|
PRTRET:
|
| 4672 |
|
|
mov r2,r7 ; return r2 = stop char
|
| 4673 |
|
|
mov r1,r5 ; return r1 = line pointer
|
| 4674 |
|
|
lw lr,24[sp]
|
| 4675 |
|
|
lw r7,16[sp]
|
| 4676 |
|
|
lw r5,8[sp]
|
| 4677 |
|
|
lw r5,[sp]
|
| 4678 |
|
|
ret #32 ; then return
|
| 4679 |
|
|
|
| 4680 |
|
|
|
| 4681 |
|
|
QTSTG:
|
| 4682 |
|
|
subui sp,sp,#8
|
| 4683 |
|
|
sw lr,[sp]
|
| 4684 |
|
|
setlo r3,#'"'
|
| 4685 |
|
|
setlo r4,#<QT3
|
| 4686 |
|
|
sethi r4,#>QT3
|
| 4687 |
|
|
call TSTC ; *** QTSTG ***
|
| 4688 |
|
|
setlo r2,#'"' ; it is a "
|
| 4689 |
|
|
QT1:
|
| 4690 |
|
|
or r1,r8,r0
|
| 4691 |
|
|
call PRTSTG ; print until another
|
| 4692 |
|
|
lw r8,r1
|
| 4693 |
|
|
bne r2,#LF,QT2 ; was last one a CR?
|
| 4694 |
|
|
addui sp,sp,#8
|
| 4695 |
|
|
bra RUNNXL ; if so, run next line
|
| 4696 |
|
|
QT3:
|
| 4697 |
|
|
setlo r3,#''''
|
| 4698 |
|
|
setlo r4,#<QT4
|
| 4699 |
|
|
sethi r4,#>QT4
|
| 4700 |
|
|
call TSTC ; is it a single quote?
|
| 4701 |
|
|
setlo r2,#'''' ; if so, do same as above
|
| 4702 |
|
|
bra QT1
|
| 4703 |
|
|
QT4:
|
| 4704 |
|
|
setlo r3,#'_'
|
| 4705 |
|
|
setlo r4,#<QT5
|
| 4706 |
|
|
sethi r4,#>QT5
|
| 4707 |
|
|
call TSTC ; is it an underline?
|
| 4708 |
|
|
setlo r1,#CR ; if so, output a CR without LF
|
| 4709 |
|
|
call GOOUT
|
| 4710 |
|
|
QT2:
|
| 4711 |
|
|
lw lr,[sp]
|
| 4712 |
|
|
addui sp,sp,#8
|
| 4713 |
|
|
jal r0,4[lr] ; skip over next i-word when returning
|
| 4714 |
|
|
QT5: ; not " ' or _
|
| 4715 |
|
|
lw lr,[sp]
|
| 4716 |
|
|
ret #8
|
| 4717 |
|
|
|
| 4718 |
|
|
|
| 4719 |
|
|
; Output a CR LF sequence
|
| 4720 |
|
|
;
|
| 4721 |
|
|
prCRLF:
|
| 4722 |
|
|
subui sp,sp,#8
|
| 4723 |
|
|
sw lr,[sp]
|
| 4724 |
|
|
setlo r1,#CR
|
| 4725 |
|
|
call GOOUT
|
| 4726 |
|
|
setlo r1,#LF
|
| 4727 |
|
|
call GOOUT
|
| 4728 |
|
|
lw lr,[sp]
|
| 4729 |
|
|
ret #8
|
| 4730 |
|
|
|
| 4731 |
|
|
|
| 4732 |
|
|
; r1 = number to print
|
| 4733 |
|
|
; r2 = number of digits
|
| 4734 |
|
|
; Register Usage
|
| 4735 |
|
|
; r5 = number of padding spaces
|
| 4736 |
|
|
PRTNUM:
|
| 4737 |
|
|
subui sp,sp,#40
|
| 4738 |
|
|
sw r3,[sp]
|
| 4739 |
|
|
sw r5,8[sp]
|
| 4740 |
|
|
sw r6,16[sp]
|
| 4741 |
|
|
sw r7,24[sp]
|
| 4742 |
|
|
sw lr,32[sp]
|
| 4743 |
|
|
ori r7,r0,#NUMWKA ; r7 = pointer to numeric work area
|
| 4744 |
|
|
mov r6,r1 ; save number for later
|
| 4745 |
|
|
mov r5,r2 ; r5 = min number of chars
|
| 4746 |
|
|
bgt r1,r0,PN1 ; is it negative? if not
|
| 4747 |
|
|
neg r1,r1 ; else make it positive
|
| 4748 |
|
|
subui r5,r5,#1 ; one less for width count
|
| 4749 |
|
|
PN1:
|
| 4750 |
|
|
lw r3,#10
|
| 4751 |
|
|
mod r2,r1,r3 ; r2 = r1 mod 10
|
| 4752 |
|
|
divui r1,r1,#10 ; r1 /= 10 divide by 10
|
| 4753 |
|
|
addui r2,r2,#'0' ; convert remainder to ascii
|
| 4754 |
|
|
sb r2,[r7] ; and store in buffer
|
| 4755 |
|
|
addui r7,r7,#1
|
| 4756 |
|
|
subui r5,r5,#1 ; decrement width
|
| 4757 |
|
|
bne r1,r0,PN1
|
| 4758 |
|
|
PN6:
|
| 4759 |
|
|
ble r5,r0,PN4 ; test pad count, skip padding if not needed
|
| 4760 |
|
|
PN3:
|
| 4761 |
|
|
setlo r1,#' ' ; display the required leading spaces
|
| 4762 |
|
|
call GOOUT
|
| 4763 |
|
|
loop r5,PN3
|
| 4764 |
|
|
PN4:
|
| 4765 |
|
|
bgt r6,r0,PN5 ; is number negative?
|
| 4766 |
|
|
setlo r1,#'-' ; if so, display the sign
|
| 4767 |
|
|
call GOOUT
|
| 4768 |
|
|
PN5:
|
| 4769 |
|
|
subui r7,r7,#1
|
| 4770 |
|
|
lb r1,[r7] ; now unstack the digits and display
|
| 4771 |
|
|
call GOOUT
|
| 4772 |
|
|
cmpui r1,r7,#NUMWKA
|
| 4773 |
|
|
bgtu r1,r0,PN5
|
| 4774 |
|
|
PNRET:
|
| 4775 |
|
|
lw lr,32[sp]
|
| 4776 |
|
|
lw r7,24[sp]
|
| 4777 |
|
|
lw r6,16[sp]
|
| 4778 |
|
|
lw r5,8[sp]
|
| 4779 |
|
|
lw r3,[sp]
|
| 4780 |
|
|
ret #40
|
| 4781 |
|
|
|
| 4782 |
|
|
|
| 4783 |
|
|
; r1 = number to print
|
| 4784 |
|
|
; r2 = number of digits
|
| 4785 |
|
|
PRTHEXNUM:
|
| 4786 |
|
|
subui sp,sp,#40
|
| 4787 |
|
|
sw r5,[sp]
|
| 4788 |
|
|
sw r6,8[sp]
|
| 4789 |
|
|
sw r7,16[sp]
|
| 4790 |
|
|
sw r8,24[sp]
|
| 4791 |
|
|
sw lr,32[sp]
|
| 4792 |
|
|
setlo r7,#<NUMWKA ; r7 = pointer to numeric work area
|
| 4793 |
|
|
sethi r7,#>NUMWKA
|
| 4794 |
|
|
or r6,r1,r0 ; save number for later
|
| 4795 |
|
|
setlo r5,#20 ; r5 = min number of chars
|
| 4796 |
|
|
or r4,r1,r0
|
| 4797 |
|
|
bgt r4,r0,PHN1 ; is it negative? if not
|
| 4798 |
|
|
neg r4,r4 ; else make it positive
|
| 4799 |
|
|
sub r5,r5,#1 ; one less for width count
|
| 4800 |
|
|
setlo r8,#20 ; maximum of 10 digits
|
| 4801 |
|
|
PHN1:
|
| 4802 |
|
|
or r1,r4,r0
|
| 4803 |
|
|
andi r1,r1,#15
|
| 4804 |
|
|
blt r1,#10,PHN7
|
| 4805 |
|
|
addui r1,r1,#'A'-10
|
| 4806 |
|
|
bra PHN8
|
| 4807 |
|
|
PHN7:
|
| 4808 |
|
|
add r1,r1,#'0' ; convert remainder to ascii
|
| 4809 |
|
|
PHN8:
|
| 4810 |
|
|
sb r1,[r7] ; and store in buffer
|
| 4811 |
|
|
add r7,r7,#1
|
| 4812 |
|
|
sub r5,r5,#1 ; decrement width
|
| 4813 |
|
|
shru r4,r4,#4
|
| 4814 |
|
|
beq r4,r0,PHN6 ; is it zero yet ?
|
| 4815 |
|
|
loop r8,PHN1 ; safety
|
| 4816 |
|
|
PHN6: ; test pad count
|
| 4817 |
|
|
ble r5,r0,PHN4 ; skip padding if not needed
|
| 4818 |
|
|
PHN3:
|
| 4819 |
|
|
setlo r1,#' ' ; display the required leading spaces
|
| 4820 |
|
|
call GOOUT
|
| 4821 |
|
|
loop r5,PHN3
|
| 4822 |
|
|
PHN4:
|
| 4823 |
|
|
bgt r6,r0,PHN5 ; is number negative?
|
| 4824 |
|
|
setlo r1,#'-' ; if so, display the sign
|
| 4825 |
|
|
call GOOUT
|
| 4826 |
|
|
PHN5:
|
| 4827 |
|
|
sub r7,r7,#1
|
| 4828 |
|
|
lb r1,[r7] ; now unstack the digits and display
|
| 4829 |
|
|
call GOOUT
|
| 4830 |
|
|
cmpui r1,r7,#NUMWKA
|
| 4831 |
|
|
bgt r1,r0,PHN5
|
| 4832 |
|
|
PHNRET:
|
| 4833 |
|
|
lw lr,32[sp]
|
| 4834 |
|
|
lw r8,24[sp]
|
| 4835 |
|
|
lw r7,16[sp]
|
| 4836 |
|
|
lw r6,8[sp]
|
| 4837 |
|
|
lw r5,[sp]
|
| 4838 |
|
|
ret #40
|
| 4839 |
|
|
|
| 4840 |
|
|
|
| 4841 |
|
|
; r1 = pointer to line
|
| 4842 |
|
|
; returns r1 = pointer to end of line + 1
|
| 4843 |
|
|
PRTLN:
|
| 4844 |
|
|
subui sp,sp,#16
|
| 4845 |
|
|
sw r5,[sp]
|
| 4846 |
|
|
sw lr,8[sp]
|
| 4847 |
|
|
addi r5,r1,#2
|
| 4848 |
|
|
lbu r1,-2[r5] ; get the binary line number
|
| 4849 |
|
|
lbu r2,-1[r5]
|
| 4850 |
|
|
shli r2,r2,#8
|
| 4851 |
|
|
or r1,r1,r2
|
| 4852 |
|
|
setlo r2,#0 ; display a 0 or more digit line no.
|
| 4853 |
|
|
call PRTNUM
|
| 4854 |
|
|
setlo r1,#' ' ; followed by a blank
|
| 4855 |
|
|
call GOOUT
|
| 4856 |
|
|
setlo r2,#0 ; stop char. is a zero
|
| 4857 |
|
|
or r1,r5,r0
|
| 4858 |
|
|
call PRTSTG ; display the rest of the line
|
| 4859 |
|
|
lw lr,8[sp]
|
| 4860 |
|
|
lw r5,[sp]
|
| 4861 |
|
|
ret #16
|
| 4862 |
|
|
|
| 4863 |
|
|
|
| 4864 |
|
|
; ===== Test text byte following the call to this subroutine. If it
|
| 4865 |
|
|
; equals the byte pointed to by r8, return to the code following
|
| 4866 |
|
|
; the call. If they are not equal, brnch to the point
|
| 4867 |
|
|
; indicated in r4.
|
| 4868 |
|
|
;
|
| 4869 |
|
|
; Registers Affected
|
| 4870 |
|
|
; r3,r8
|
| 4871 |
|
|
; Returns
|
| 4872 |
|
|
; r8 = updated text pointer
|
| 4873 |
|
|
;
|
| 4874 |
|
|
TSTC
|
| 4875 |
|
|
subui sp,sp,#16
|
| 4876 |
|
|
sw lr,[sp]
|
| 4877 |
|
|
sw r1,8[sp]
|
| 4878 |
|
|
call IGNBLK ; ignore leading blanks
|
| 4879 |
|
|
lb r1,[r8]
|
| 4880 |
|
|
beq r3,r1,TC1 ; is it = to what r8 points to? if so
|
| 4881 |
|
|
lw r1,8[sp]
|
| 4882 |
|
|
lw lr,[sp]
|
| 4883 |
|
|
addui sp,sp,#16
|
| 4884 |
|
|
jal r0,[r4] ; jump to the routine
|
| 4885 |
|
|
TC1:
|
| 4886 |
|
|
add r8,r8,#1 ; if equal, bump text pointer
|
| 4887 |
|
|
lw r1,8[sp]
|
| 4888 |
|
|
lw lr,[sp]
|
| 4889 |
|
|
ret #16
|
| 4890 |
|
|
|
| 4891 |
|
|
; ===== See if the text pointed to by r8 is a number. If so,
|
| 4892 |
|
|
; return the number in r2 and the number of digits in r3,
|
| 4893 |
|
|
; else return zero in r2 and r3.
|
| 4894 |
|
|
; Registers Affected
|
| 4895 |
|
|
; r1,r2,r3,r4
|
| 4896 |
|
|
; Returns
|
| 4897 |
|
|
; r1 = number
|
| 4898 |
|
|
; r2 = number of digits in number
|
| 4899 |
|
|
; r8 = updated text pointer
|
| 4900 |
|
|
;
|
| 4901 |
|
|
TSTNUM:
|
| 4902 |
|
|
subui sp,sp,#8
|
| 4903 |
|
|
sw lr,[sp]
|
| 4904 |
|
|
call IGNBLK ; skip over blanks
|
| 4905 |
|
|
setlo r1,#0 ; initialize return parameters
|
| 4906 |
|
|
setlo r2,#0
|
| 4907 |
|
|
TN1:
|
| 4908 |
|
|
lb r3,[r8]
|
| 4909 |
|
|
bltui r3,#'0',TSNMRET ; is it less than zero?
|
| 4910 |
|
|
bgtui r3,#'9',TSNMRET ; is it greater than nine?
|
| 4911 |
|
|
setlo r4,#0xFFFFFFFF
|
| 4912 |
|
|
sethi r4,#0x07FFFFFF
|
| 4913 |
|
|
bleu r1,r4,TN2 ; see if there's room for new digit
|
| 4914 |
|
|
setlo r1,msgNumTooBig
|
| 4915 |
|
|
bra ERROR ; if not, we've overflowd
|
| 4916 |
|
|
TN2:
|
| 4917 |
|
|
mului r1,r1,#10 ; quickly multiply result by 10
|
| 4918 |
|
|
addi r8,r8,#1 ; adjust text pointer
|
| 4919 |
|
|
andi r3,r3,#0x0F ; add in the new digit
|
| 4920 |
|
|
add r1,r1,r3
|
| 4921 |
|
|
addi r2,r2,#1 ; increment the no. of digits
|
| 4922 |
|
|
bra TN1
|
| 4923 |
|
|
TSNMRET:
|
| 4924 |
|
|
lw lr,[sp]
|
| 4925 |
|
|
ret #8
|
| 4926 |
|
|
|
| 4927 |
|
|
|
| 4928 |
|
|
;===== Skip over blanks in the text pointed to by r8.
|
| 4929 |
|
|
;
|
| 4930 |
|
|
; Registers Affected:
|
| 4931 |
|
|
; r8
|
| 4932 |
|
|
; Returns
|
| 4933 |
|
|
; r8 = pointer updateded past any spaces or tabs
|
| 4934 |
|
|
;
|
| 4935 |
|
|
IGNBLK:
|
| 4936 |
|
|
subui sp,sp,#8
|
| 4937 |
|
|
sw r1,[sp]
|
| 4938 |
|
|
IGB2:
|
| 4939 |
|
|
lb r1,[r8] ; get char
|
| 4940 |
|
|
beqi r1,#' ',IGB1 ; see if it's a space
|
| 4941 |
|
|
bnei r1,#'\t',IGBRET ; or a tab
|
| 4942 |
|
|
IGB1:
|
| 4943 |
|
|
add r8,r8,#1 ; increment the text pointer
|
| 4944 |
|
|
bra IGB2
|
| 4945 |
|
|
IGBRET:
|
| 4946 |
|
|
lw r1,[sp]
|
| 4947 |
|
|
ret #8
|
| 4948 |
|
|
|
| 4949 |
|
|
|
| 4950 |
|
|
; ===== Convert the line of text in the input buffer to upper
|
| 4951 |
|
|
; case (except for stuff between quotes).
|
| 4952 |
|
|
;
|
| 4953 |
|
|
; Registers Affected
|
| 4954 |
|
|
; r1,r3
|
| 4955 |
|
|
; Returns
|
| 4956 |
|
|
; r8 = pointing to end of text in buffer
|
| 4957 |
|
|
;
|
| 4958 |
|
|
TOUPBUF:
|
| 4959 |
|
|
subui sp,sp,#8
|
| 4960 |
|
|
sw lr,[sp]
|
| 4961 |
|
|
setlo r8,BUFFER ; set up text pointer
|
| 4962 |
|
|
setlo r3,#0 ; clear quote flag
|
| 4963 |
|
|
TOUPB1:
|
| 4964 |
|
|
lb r1,[r8] ; get the next text char.
|
| 4965 |
|
|
add r8,r8,#1
|
| 4966 |
|
|
beqi r1,#CR,TOUPBRT ; is it end of line?
|
| 4967 |
|
|
beqi r1,#'"',DOQUO ; a double quote?
|
| 4968 |
|
|
beqi r1,#'''',DOQUO ; or a single quote?
|
| 4969 |
|
|
bne r3,r0,TOUPB1 ; inside quotes?
|
| 4970 |
|
|
call toUpper ; convert to upper case
|
| 4971 |
|
|
sb r1,-1[r8] ; store it
|
| 4972 |
|
|
bra TOUPB1 ; and go back for more
|
| 4973 |
|
|
DOQUO:
|
| 4974 |
|
|
bne r3,r0,DOQUO1; are we inside quotes?
|
| 4975 |
|
|
or r3,r1,r0 ; if not, toggle inside-quotes flag
|
| 4976 |
|
|
bra TOUPB1
|
| 4977 |
|
|
DOQUO1:
|
| 4978 |
|
|
bne r3,r1,TOUPB1 ; make sure we're ending proper quote
|
| 4979 |
|
|
setlo r3,#0 ; else clear quote flag
|
| 4980 |
|
|
bra TOUPB1
|
| 4981 |
|
|
TOUPBRT:
|
| 4982 |
|
|
lw lr,[sp]
|
| 4983 |
|
|
ret #8
|
| 4984 |
|
|
|
| 4985 |
|
|
|
| 4986 |
|
|
; ===== Convert the character in r1 to upper case
|
| 4987 |
|
|
;
|
| 4988 |
|
|
toUpper
|
| 4989 |
|
|
blt r1,#'a',TOUPRET ; is it < 'a'?
|
| 4990 |
|
|
bgt r1,#'z',TOUPRET ; or > 'z'?
|
| 4991 |
|
|
sub r1,r1,#32 ; if not, make it upper case
|
| 4992 |
|
|
TOUPRET
|
| 4993 |
|
|
ret
|
| 4994 |
|
|
|
| 4995 |
|
|
|
| 4996 |
|
|
; 'CHKIO' checks the input. If there's no input, it will return
|
| 4997 |
|
|
; to the caller with the r1=0. If there is input, the input byte is in r1.
|
| 4998 |
|
|
; However, if a control-C is read, 'CHKIO' will warm-start BASIC and will
|
| 4999 |
|
|
; not return to the caller.
|
| 5000 |
|
|
;
|
| 5001 |
|
|
CHKIO:
|
| 5002 |
|
|
subui sp,sp,#8 ; save link reg
|
| 5003 |
|
|
sw lr,[sp]
|
| 5004 |
|
|
call GOIN ; get input if possible
|
| 5005 |
|
|
beq r1,#-1,CHKRET2 ; if Zero, no input
|
| 5006 |
|
|
bnei r1,#CTRLC,CHKRET ; is it control-C?
|
| 5007 |
|
|
jmp WSTART ; if so, do a warm start
|
| 5008 |
|
|
CHKRET2:
|
| 5009 |
|
|
xor r1,r1,r1
|
| 5010 |
|
|
CHKRET:
|
| 5011 |
|
|
lw lr,[sp] ;r1=0
|
| 5012 |
|
|
ret #8
|
| 5013 |
|
|
|
| 5014 |
|
|
|
| 5015 |
|
|
; ===== Display a CR-LF sequence
|
| 5016 |
|
|
;
|
| 5017 |
|
|
CRLF:
|
| 5018 |
|
|
setlo r1,CLMSG
|
| 5019 |
|
|
|
| 5020 |
|
|
|
| 5021 |
|
|
; ===== Display a zero-ended string pointed to by register r1
|
| 5022 |
|
|
; Registers Affected
|
| 5023 |
|
|
; r1,r2,r4
|
| 5024 |
|
|
;
|
| 5025 |
|
|
PRMESG:
|
| 5026 |
|
|
subui sp,sp,#16
|
| 5027 |
|
|
sw r5,[sp]
|
| 5028 |
|
|
sw lr,8[sp]
|
| 5029 |
|
|
mov r5,r1 ; r5 = pointer to message
|
| 5030 |
|
|
PRMESG1:
|
| 5031 |
|
|
add r5,r5,#1
|
| 5032 |
|
|
lb r1,-1[r5] ; get the char.
|
| 5033 |
|
|
beq r1,r0,PRMRET
|
| 5034 |
|
|
call GOOUT ;else display it trashes r4
|
| 5035 |
|
|
bra PRMESG1
|
| 5036 |
|
|
PRMRET:
|
| 5037 |
|
|
mov r1,r5
|
| 5038 |
|
|
lw lr,8[sp]
|
| 5039 |
|
|
lw r5,[sp]
|
| 5040 |
|
|
ret #16
|
| 5041 |
|
|
|
| 5042 |
|
|
|
| 5043 |
|
|
; ===== Display a zero-ended string pointed to by register r1
|
| 5044 |
|
|
; Registers Affected
|
| 5045 |
|
|
; r1,r2,r3
|
| 5046 |
|
|
;
|
| 5047 |
|
|
PRMESGAUX:
|
| 5048 |
|
|
subui sp,sp,#16
|
| 5049 |
|
|
sw r5,[sp]
|
| 5050 |
|
|
sw lr,8[sp]
|
| 5051 |
|
|
mov r5,r1 ; r3 = pointer
|
| 5052 |
|
|
PRMESGA1:
|
| 5053 |
|
|
addui r5,r5,#1
|
| 5054 |
|
|
lb r1,-1[r5] ; get the char.
|
| 5055 |
|
|
beq r1,r0,PRMRETA
|
| 5056 |
|
|
call GOAUXO ;else display it
|
| 5057 |
|
|
bra PRMESGA1
|
| 5058 |
|
|
PRMRETA:
|
| 5059 |
|
|
mov r1,r5
|
| 5060 |
|
|
lw lr,8[sp]
|
| 5061 |
|
|
lw r5,[sp]
|
| 5062 |
|
|
ret #16
|
| 5063 |
|
|
|
| 5064 |
|
|
;*****************************************************
|
| 5065 |
|
|
; The following routines are the only ones that need *
|
| 5066 |
|
|
; to be changed for a different I/O environment. *
|
| 5067 |
|
|
;*****************************************************
|
| 5068 |
|
|
|
| 5069 |
|
|
|
| 5070 |
|
|
; ===== Output character to the console (Port 1) from register r1
|
| 5071 |
|
|
; (Preserves all registers.)
|
| 5072 |
|
|
;
|
| 5073 |
|
|
OUTC:
|
| 5074 |
|
|
jmp DisplayChar
|
| 5075 |
|
|
|
| 5076 |
|
|
|
| 5077 |
|
|
; ===== Input a character from the console into register D0 (or
|
| 5078 |
|
|
; return Zero status if there's no character available).
|
| 5079 |
|
|
;
|
| 5080 |
|
|
INC:
|
| 5081 |
|
|
jmp KeybdGetChar
|
| 5082 |
|
|
|
| 5083 |
|
|
|
| 5084 |
|
|
;*
|
| 5085 |
|
|
;* ===== Input a character from the host into register r1 (or
|
| 5086 |
27 |
robfinch |
;* return Zero status if there's no character available).
|
| 5087 |
|
|
;*
|
| 5088 |
|
|
AUXIN:
|
| 5089 |
43 |
robfinch |
call SerialGetChar
|
| 5090 |
|
|
beqi r1,#-1,AXIRET_ZERO
|
| 5091 |
27 |
robfinch |
andi r1,r1,#0x7f ;zero out the high bit
|
| 5092 |
|
|
AXIRET:
|
| 5093 |
|
|
ret
|
| 5094 |
43 |
robfinch |
AXIRET_ZERO:
|
| 5095 |
|
|
xor r1,r1,r1
|
| 5096 |
|
|
ret
|
| 5097 |
27 |
robfinch |
|
| 5098 |
43 |
robfinch |
; ===== Output character to the host (Port 2) from register r1
|
| 5099 |
|
|
; (Preserves all registers.)
|
| 5100 |
|
|
;
|
| 5101 |
|
|
AUXOUT
|
| 5102 |
|
|
jmp SerialPutChar ; call boot rom routine
|
| 5103 |
|
|
|
| 5104 |
|
|
|
| 5105 |
|
|
_cls
|
| 5106 |
|
|
call clearScreen
|
| 5107 |
|
|
bra FINISH
|
| 5108 |
|
|
|
| 5109 |
|
|
_wait10
|
| 5110 |
|
|
ret
|
| 5111 |
|
|
_getATAStatus
|
| 5112 |
|
|
ret
|
| 5113 |
|
|
_waitCFNotBusy
|
| 5114 |
|
|
ret
|
| 5115 |
|
|
_rdcf
|
| 5116 |
|
|
br FINISH
|
| 5117 |
|
|
rdcf6
|
| 5118 |
|
|
br ERROR
|
| 5119 |
|
|
|
| 5120 |
|
|
|
| 5121 |
|
|
; ===== Return to the resident monitor, operating system, etc.
|
| 5122 |
|
|
;
|
| 5123 |
27 |
robfinch |
BYEBYE:
|
| 5124 |
43 |
robfinch |
lw sp,OSSP
|
| 5125 |
|
|
lw lr,[sp]
|
| 5126 |
|
|
ret #8
|
| 5127 |
|
|
|
| 5128 |
|
|
; MOVE.B #228,D7 return to Tutor
|
| 5129 |
27 |
robfinch |
; TRAP #14
|
| 5130 |
|
|
|
| 5131 |
43 |
robfinch |
.align 16
|
| 5132 |
27 |
robfinch |
msgInit db CR,LF,"Raptor64 Tiny BASIC v1.0",CR,LF,"(C) 2012 Robert Finch",CR,LF,LF,0
|
| 5133 |
|
|
OKMSG db CR,LF,"OK",CR,LF,0
|
| 5134 |
|
|
msgWhat db "What?",CR,LF,0
|
| 5135 |
|
|
SRYMSG db "Sorry."
|
| 5136 |
|
|
CLMSG db CR,LF,0
|
| 5137 |
|
|
msgReadError db "Compact FLASH read error",CR,LF,0
|
| 5138 |
|
|
msgNumTooBig db "Number is too big",CR,LF,0
|
| 5139 |
|
|
msgDivZero db "Division by zero",CR,LF,0
|
| 5140 |
|
|
msgVarSpace db "Out of variable space",CR,LF,0
|
| 5141 |
|
|
msgBytesFree db " bytes free",CR,LF,0
|
| 5142 |
|
|
msgReady db CR,LF,"Ready",CR,LF,0
|
| 5143 |
|
|
msgComma db "Expecting a comma",CR,LF,0
|
| 5144 |
|
|
msgLineRange db "Line number too big",CR,LF,0
|
| 5145 |
|
|
msgVar db "Expecting a variable",CR,LF,0
|
| 5146 |
|
|
msgRNDBad db "RND bad parameter",CR,LF,0
|
| 5147 |
|
|
msgSYSBad db "SYS bad address",CR,LF,0
|
| 5148 |
|
|
msgInputVar db "INPUT expecting a variable",CR,LF,0
|
| 5149 |
|
|
msgNextFor db "NEXT without FOR",CR,LF,0
|
| 5150 |
|
|
msgNextVar db "NEXT expecting a defined variable",CR,LF,0
|
| 5151 |
|
|
msgBadGotoGosub db "GOTO/GOSUB bad line number",CR,LF,0
|
| 5152 |
|
|
msgRetWoGosub db "RETURN without GOSUB",CR,LF,0
|
| 5153 |
|
|
msgTooBig db "Program is too big",CR,LF,0
|
| 5154 |
|
|
msgExtraChars db "Extra characters on line ignored",CR,LF,0
|
| 5155 |
|
|
|
| 5156 |
43 |
robfinch |
align 8
|
| 5157 |
|
|
LSTROM equ * ; end of possible ROM area
|
| 5158 |
|
|
; END
|
| 5159 |
27 |
robfinch |
|
| 5160 |
43 |
robfinch |
;*
|
| 5161 |
|
|
;* ===== Return to the resident monitor, operating system, etc.
|
| 5162 |
|
|
;*
|
| 5163 |
|
|
BYEBYE:
|
| 5164 |
|
|
jmp Monitor
|
| 5165 |
|
|
; MOVE.B #228,D7 ;return to Tutor
|
| 5166 |
|
|
; TRAP #14
|
| 5167 |
27 |
robfinch |
|
| 5168 |
|
|
;==============================================================================
|
| 5169 |
10 |
robfinch |
; Checkerboard RAM tester
|
| 5170 |
|
|
;==============================================================================
|
| 5171 |
|
|
;
|
| 5172 |
27 |
robfinch |
code
|
| 5173 |
|
|
align 16
|
| 5174 |
10 |
robfinch |
ramtest:
|
| 5175 |
|
|
or r8,r0,r0 ; r8 = 0
|
| 5176 |
|
|
ori r1,r0,#0xAAAA5555AAAA5555 ; checkerboard pattern
|
| 5177 |
|
|
ramtest2:
|
| 5178 |
|
|
sw r1,[r8] ; save the checkerboard to memory
|
| 5179 |
|
|
lw r2,[r8] ; read it back
|
| 5180 |
|
|
cmp r3,r1,r2 ; is it the same ?
|
| 5181 |
27 |
robfinch |
bne r3,r0,ramtest1
|
| 5182 |
|
|
addui r8,r8,#8 ; increment RAM pointer
|
| 5183 |
|
|
cmpi r3,r8,#0x0000_0000_0400_0000
|
| 5184 |
|
|
blt r3,r0,ramtest2
|
| 5185 |
10 |
robfinch |
ramtest1:
|
| 5186 |
|
|
or r10,r8,r0 ; r10 = max ram address
|
| 5187 |
|
|
; readback the checkerboard pattern
|
| 5188 |
|
|
or r8,r0,r0 ; r8 = 0
|
| 5189 |
|
|
ramtest4:
|
| 5190 |
|
|
lw r2,[r8]
|
| 5191 |
|
|
cmpi r3,r2,#0xAAAA5555AAAA5555
|
| 5192 |
27 |
robfinch |
bne r3,r0,ramtest3
|
| 5193 |
10 |
robfinch |
addi r8,r8,#8
|
| 5194 |
|
|
cmpi r3,r8,#0x0000_0000_0100_0000
|
| 5195 |
27 |
robfinch |
blt r3,r0,ramtest4
|
| 5196 |
10 |
robfinch |
ramtest3:
|
| 5197 |
|
|
bne r8,r10,ramtest8 ; check for equal maximum address
|
| 5198 |
|
|
|
| 5199 |
|
|
; perform ramtest again with inverted checkerboard
|
| 5200 |
|
|
or r8,r0,r0 ; r8 = 0
|
| 5201 |
|
|
ori r1,r0,#0x5555AAAA5555AAAA
|
| 5202 |
|
|
ramtest5:
|
| 5203 |
|
|
sw r1,[r8]
|
| 5204 |
|
|
lw r2,[r8]
|
| 5205 |
|
|
cmp r3,r1,r2
|
| 5206 |
27 |
robfinch |
bne r3,r0,ramtest6
|
| 5207 |
10 |
robfinch |
addi r8,r8,#8
|
| 5208 |
|
|
cmpi r3,r8,#0x0000_0000_0100_0000
|
| 5209 |
27 |
robfinch |
blt r3,r0,ramtest5
|
| 5210 |
10 |
robfinch |
ramtest6:
|
| 5211 |
|
|
or r11,r8,r0 ; r11 = max ram address
|
| 5212 |
|
|
; readback checkerboard
|
| 5213 |
|
|
or r8,r0,r0
|
| 5214 |
|
|
ramtest7:
|
| 5215 |
|
|
lw r2,[r8]
|
| 5216 |
|
|
cmpi r3,r2,#0x5555AAAA5555AAAA
|
| 5217 |
27 |
robfinch |
bne r3,r0,ramtest8
|
| 5218 |
10 |
robfinch |
addi r8,r8,#8
|
| 5219 |
|
|
cmpi r3,r8,#0x0000_0000_0100_0000
|
| 5220 |
27 |
robfinch |
blt r3,r0,ramtest7
|
| 5221 |
10 |
robfinch |
ramtest8:
|
| 5222 |
|
|
beq r8,r11,ramtest9
|
| 5223 |
|
|
min r8,r8,r11
|
| 5224 |
|
|
ramtest9:
|
| 5225 |
|
|
beq r8,r10,ramtest10
|
| 5226 |
|
|
min r8,r8,r10
|
| 5227 |
|
|
ramtest10:
|
| 5228 |
|
|
sw r8,0x00000400 ;memend
|
| 5229 |
27 |
robfinch |
ret
|
| 5230 |
|
|
|
| 5231 |
|
|
;-------------------------------------------
|
| 5232 |
43 |
robfinch |
;-------------------------------------------
|
| 5233 |
|
|
;
|
| 5234 |
|
|
iberr_rout:
|
| 5235 |
|
|
lea r1,msgiberr
|
| 5236 |
|
|
call DisplayString
|
| 5237 |
|
|
mfspr r1,EPC
|
| 5238 |
|
|
call DisplayWord
|
| 5239 |
|
|
wait
|
| 5240 |
|
|
jmp start
|
| 5241 |
|
|
dberr_rout:
|
| 5242 |
|
|
lea r1,msgdberr
|
| 5243 |
|
|
call DisplayString
|
| 5244 |
|
|
mfspr r1,ERRADR
|
| 5245 |
|
|
call DisplayWord
|
| 5246 |
|
|
lea r1,msgEPC
|
| 5247 |
|
|
call DisplayString
|
| 5248 |
|
|
mfspr r1,EPC
|
| 5249 |
|
|
call DisplayWord
|
| 5250 |
|
|
call CRLF
|
| 5251 |
|
|
lw r2,#31
|
| 5252 |
|
|
dberr1:
|
| 5253 |
|
|
mtspr PCHI,r2
|
| 5254 |
|
|
nop
|
| 5255 |
|
|
nop
|
| 5256 |
|
|
nop
|
| 5257 |
|
|
mfspr r1,PCHISTORIC
|
| 5258 |
|
|
call DisplayWord
|
| 5259 |
|
|
call CRLF
|
| 5260 |
|
|
loop r2,dberr1
|
| 5261 |
|
|
wait
|
| 5262 |
|
|
jmp start
|
| 5263 |
|
|
.align 16
|
| 5264 |
|
|
msgdberr:
|
| 5265 |
|
|
db "Data bus error at: ",0
|
| 5266 |
|
|
msgEPC:
|
| 5267 |
|
|
db " EPC: ",0
|
| 5268 |
|
|
msgiberr:
|
| 5269 |
|
|
db "Err fetching instruction at: ",0
|
| 5270 |
|
|
.align 16
|
| 5271 |
|
|
|
| 5272 |
|
|
;------------------------------------------------------------------------------
|
| 5273 |
27 |
robfinch |
; IRQ routine
|
| 5274 |
43 |
robfinch |
;------------------------------------------------------------------------------
|
| 5275 |
|
|
;
|
| 5276 |
27 |
robfinch |
irqrout:
|
| 5277 |
43 |
robfinch |
subui sp,sp,#32
|
| 5278 |
|
|
sw r1,[sp] ; save off a working register
|
| 5279 |
|
|
sw r2,8[sp] ; and a second work register
|
| 5280 |
|
|
sw r26,16[sp] ; save off implicit constant builder reg
|
| 5281 |
|
|
sw lr,24[sp]
|
| 5282 |
|
|
inch r1,PIC ; r1= which IRQ line is active
|
| 5283 |
|
|
|
| 5284 |
|
|
; 1000 Hz interrupt
|
| 5285 |
|
|
; This IRQ must be fast, so it's placed inline
|
| 5286 |
|
|
; Increments the millisecond counter, and switches to the next context
|
| 5287 |
|
|
;
|
| 5288 |
|
|
irq1000Hz:
|
| 5289 |
|
|
bnei r1,#2,irq100Hz
|
| 5290 |
|
|
outb r0,0xFFFFFFFF_FFFF0000 ; acknowledge interrupt
|
| 5291 |
|
|
lw r1,Milliseconds ; increment milliseconds count
|
| 5292 |
|
|
addui r1,r1,#1
|
| 5293 |
|
|
sw r1,Milliseconds
|
| 5294 |
|
|
lea r2,TEXTSCR
|
| 5295 |
|
|
inch r1,332[r2]
|
| 5296 |
|
|
addui r1,r1,#1
|
| 5297 |
|
|
outc r1,332[r2]
|
| 5298 |
|
|
lw lr,24[sp]
|
| 5299 |
|
|
lw r26,16[sp] ; restore registers from stack
|
| 5300 |
|
|
lw r2,8[sp]
|
| 5301 |
|
|
lw r1,[sp]
|
| 5302 |
|
|
addui sp,sp,#32 ; restore stack pointer
|
| 5303 |
|
|
iepp ; move to the next context
|
| 5304 |
|
|
nop
|
| 5305 |
|
|
nop
|
| 5306 |
|
|
nop
|
| 5307 |
|
|
iret ; return to the next context
|
| 5308 |
|
|
|
| 5309 |
|
|
; 100 Hz interrupt
|
| 5310 |
|
|
; This IRQ could have some work to do, including flashing a cursor. So
|
| 5311 |
|
|
; we call a subroutine.
|
| 5312 |
|
|
;
|
| 5313 |
|
|
irq100Hz:
|
| 5314 |
|
|
bnei r1,#3,irqSerial
|
| 5315 |
|
|
lw r1,p100IRQvec
|
| 5316 |
|
|
; jal lr,[r1]
|
| 5317 |
|
|
call Pulse100
|
| 5318 |
|
|
bra irqret
|
| 5319 |
|
|
|
| 5320 |
|
|
irqSerial:
|
| 5321 |
|
|
bnei r1,#8,irqRaster
|
| 5322 |
|
|
lw r1,serialIRQvec
|
| 5323 |
|
|
jal lr,[r1]
|
| 5324 |
|
|
bra irqret
|
| 5325 |
|
|
|
| 5326 |
|
|
irqRaster:
|
| 5327 |
|
|
bnei r1,#13,irqKeybd
|
| 5328 |
|
|
lw r1,rasterIRQvec
|
| 5329 |
|
|
; jal lr,[r1]
|
| 5330 |
|
|
call RasterIRQfn
|
| 5331 |
|
|
bra irqret
|
| 5332 |
|
|
|
| 5333 |
|
|
irqKeybd:
|
| 5334 |
|
|
beqi r1,#1,ColdStart ; CTRL-ALT-DEL interrupt
|
| 5335 |
|
|
bnei r1,#15,irqret
|
| 5336 |
|
|
lw r1,keybdIRQvec
|
| 5337 |
27 |
robfinch |
call KeybdIRQ
|
| 5338 |
43 |
robfinch |
; jal lr,[r1]
|
| 5339 |
|
|
|
| 5340 |
|
|
irqret:
|
| 5341 |
|
|
lw lr,24[sp]
|
| 5342 |
|
|
lw r26,16[sp] ; restore registers from stack
|
| 5343 |
|
|
lw r2,8[sp]
|
| 5344 |
|
|
lw r1,[sp]
|
| 5345 |
|
|
addui sp,sp,#32 ; restore stack pointer
|
| 5346 |
27 |
robfinch |
iret
|
| 5347 |
|
|
|
| 5348 |
|
|
;-------------------------------------------
|
| 5349 |
|
|
; NMI routine
|
| 5350 |
|
|
;-------------------------------------------
|
| 5351 |
|
|
nmirout:
|
| 5352 |
|
|
iret
|
| 5353 |
|
|
|
| 5354 |
|
|
;-------------------------------------------
|
| 5355 |
|
|
; Handle miss on Data TLB
|
| 5356 |
|
|
;-------------------------------------------
|
| 5357 |
|
|
DTLBHandler:
|
| 5358 |
|
|
sw r1,0xFFFF_FFFF_FFFF_0000
|
| 5359 |
|
|
sw r2,0xFFFF_FFFF_FFFF_0008
|
| 5360 |
|
|
dh1:
|
| 5361 |
|
|
omgi r1,#0 ; try open mutex gate #0 (TLB protector)
|
| 5362 |
|
|
bne r1,r0,dh1 ; spinlock if gate is closed
|
| 5363 |
|
|
mfspr r1,PTA ; get the page table address
|
| 5364 |
|
|
mfspr r2,BadVAddr ; get the bad virtual address
|
| 5365 |
|
|
mtspr TLBVirtPage,r2 ; which virtual address to update
|
| 5366 |
|
|
shrui r2,r2,#13 ; turn va into index
|
| 5367 |
|
|
addu r1,r1,r2
|
| 5368 |
|
|
lw r2,[r1] ; get the physical address from the table
|
| 5369 |
|
|
and r2,r2,#FFFF_FFFF_FFFF_E000 ; mask off lower bits
|
| 5370 |
|
|
mtspr TLBPhysPage0,r2 ;
|
| 5371 |
|
|
lw r2,8[r1] ; get the physical address from the table
|
| 5372 |
|
|
and r2,r2,#FFFF_FFFF_FFFF_E000 ; mask off lower bits
|
| 5373 |
|
|
mtspr TLBPhysPage1,r2 ;
|
| 5374 |
|
|
tlbwr ; update a random entry in the TLB
|
| 5375 |
|
|
cmgi #0 ; close the mutex gate
|
| 5376 |
|
|
lw r1,0xFFFF_FFFF_FFFF_0000
|
| 5377 |
|
|
lw r2,0xFFFF_FFFF_FFFF_0008
|
| 5378 |
|
|
iret
|
| 5379 |
43 |
robfinch |
.align 32
|
| 5380 |
|
|
|
| 5381 |
27 |
robfinch |
org 0xFFFF_FFFF_FFFF_FFB0
|
| 5382 |
|
|
jmp DTLBHandler
|
| 5383 |
10 |
robfinch |
nop
|
| 5384 |
|
|
nop
|
| 5385 |
27 |
robfinch |
org 0xFFFF_FFFF_FFFF_FFC0
|
| 5386 |
|
|
jmp DTLBHandler
|
| 5387 |
10 |
robfinch |
nop
|
| 5388 |
|
|
nop
|
| 5389 |
43 |
robfinch |
|
| 5390 |
|
|
; NMI vector
|
| 5391 |
27 |
robfinch |
org 0xFFFF_FFFF_FFFF_FFE0
|
| 5392 |
|
|
jmp nmirout
|
| 5393 |
10 |
robfinch |
nop
|
| 5394 |
|
|
nop
|
| 5395 |
43 |
robfinch |
|
| 5396 |
|
|
; RST vector
|
| 5397 |
10 |
robfinch |
org 0xFFFF_FFFF_FFFF_FFF0
|
| 5398 |
|
|
jmp start
|
| 5399 |
27 |
robfinch |
nop
|
| 5400 |
|
|
nop
|
| 5401 |
|
|
|
| 5402 |
|
|
|
