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zpekic |
;-------------------------------------------------------------------------
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; ALTMON.ASM - 1K ROM monitor for the Altair 8800.
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;
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; This monitor is based on the 2.0C monitor from Vector Graphic. The
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; original version has been updated to use Altair 2SIO serial ports
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; for I/O and several commands have been added and/or modified.
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;
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; A typical location for this PROM in an Altair is at F800, though
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; it can be assembled at most any address. The stack is typically
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; placed at the top of the minimum RAM you expect to have in your
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; system.
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;
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; Version Date Author
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; ------- ---------- ---------------------------------------
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; 1.0 01/10/2016 Mike Douglas (Original)
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;
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; 1.1 02/29/2016 Mike Douglas
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; Fix bug in DUMP code that caused improper range of bytes
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; to display. Also in DUMP, display '.' for all characters
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; 7Fh or above.
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;
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; Initialize 2nd 2SIO port so that loading of Intel HEX
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; files works over the 2nd port. Only flush hex file
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; input on the console serial port to free up code space
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; and because it's not really required for the 2nd port.
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;
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;-------------------------------------------------------------------------
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;
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; Following is a summary of changes from the original VG 2.0c monitor:
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;
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; All commands immediately echo a full command name as soon as the
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; first command letter is typed (e.g., typing "M" immediately
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; displays "MOVE"). This makes it easier to identify commands
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; without a list of commands present.
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;
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; The ESC key can be pressed to abort input or commands as in
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; the later 4.x monitors from VG. The original ctrl-c abort is
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; still present as well.
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;
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; The B (boot) command jumps to the Altair disk boot loader PROM
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; at FF00 instead of the North Star boot ROM.
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;
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; A (ASCII dump) command removed and D (hex dump) updated to display
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; both hex and ASCII.
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;
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; X (exchange) command changed to the E command.
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;
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; H command added to load Intel hex file via either serial port
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; on a 2SIO. The L (load and go from tape) does a hex file load
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; as well (all tape commands eliminated).
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;
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; J treated as jump (i.e., go to) command instead of jump to North
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; Star DOS.
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;
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; K treated as fill memory with "K"onstant instead of jump to zero
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; (was the Z command which has been removed).
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;
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; R command sizes RAM (i.e., runs the N non-destructive memory test)
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; Was previously a read from cassette command. All cassette commands
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; have been removed.
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;
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; The Y command (Vector Graphic relocating loader) command has been
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; removed.
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;
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; The T test memory command skips the 256 byte page the stack is on
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; to prevent crashing the program. A "." pacifier is displayed
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; after each cycle through the memory test range is completed
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;
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;-------------------------------------------------------------------------
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;
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; Command Summary:
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;
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; B jump to Altair disk boot loader (FF00)
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; C SSSS FFFF CCCC compare blocks
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; D SSSS FFFF dump in hex and ASCII
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; E SSSS FFFF DDDD exchange block
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; F SSSS FFFF DD DD find two byte sequence
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; G SSSS go to and execute
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; H P load Intel hex file from 2SIO port 0 or 1
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; I PP input from I/O port
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; J SSSS go to and execute (G)
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; K SSSS FFFF DD fill with "K"onstant
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; L P load Intel hex file from 2SIO port 0 or 1
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; M SSSS FFFF DDDD move block
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; N non destructive memory test (size RAM)
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; O PP DD output to port
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; P LLLL program memory
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; Q SSSS FFFF compute checksum
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; R non destructive memory test (size RAM)
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; S SSSS FFFF DD search for single byte sequence
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; T SSSS FFFF test memory
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;
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;-------------------------------------------------------------------------
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;
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; Memory location equates
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org 00400h ;ROM location
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SPTR equ 0ffffh ;stack pointer (use 256 byte boundary)
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SIOPORT equ SPTR-32 ;2SIO port used for hex load
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BOOT equ 0ff00h ;Altair disk boot loader ROM
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; 88-2SIO equates
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CONS equ 10h ;console status port
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COND equ 11h ;console data port
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TBE equ 2 ;transmit buffer entry
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RDA equ 1 ;receive data available
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; Misc Equates
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CR equ 13 ;ASCII carriage return
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LF equ 10 ;ASCII line feed
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CTRLC equ 3 ;ASCII control-c
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ESC equ 27 ;ASCII ESCAPE
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;---------------------------------------------------------
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; monit - monitor entry point
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;---------------------------------------------------------
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monit mvi a,3 ;reset 6850 uart
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out CONS
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out CONS+2 ;2nd 2SIO port as well
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mvi a,11h ;8N2
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out CONS
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out CONS+2 ;2nd 2SIO port as well
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lxi sp,SPTR
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call dspMsg ;display welcome banner
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db CR,LF,LF,'ALTMON 1.','1'+80h
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; start - command processing loop
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start lxi sp,SPTR ;re-init stack pointer
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lxi h,start ;RET's go back to start
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push h
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call crlf ;display '*' prompt after CR/LF
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mvi a,'*'
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call ptcn
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call getCon ;read command from keyboard
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ani 05FH ;lower case to upper case
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cpi 'B'
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rc ;too small
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cpi 'U'
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rnc ;too large
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lxi h,cmdTbl+100h-2*'B' ;'B' indexes to start of cmdtbl
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add a ;2 bytes per entry
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add l
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mov l,a
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mov e,m ;e=lsb of jump address
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inx h
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mov d,m ;d=high byte of jump address
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xchg
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pchl ;away we go
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; Command Table
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cmdTbl dw doboot ;B jump to Altair disk boot loader
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dw compr ;C SSSS FFFF CCCC compare blocks
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dw disp ;D SSSS FFFF dump in hex
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dw exchg ;E SSSS FFFF DDDD exchange block
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dw srch2 ;F SSSS FFFF DD DD two byte search
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dw exec ;G SSSS go to and execute
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dw hexLoad ;H P load Intel hex file from port
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dw pinpt ;I PP input from I/O port
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dw exec ;J SSSS jump to and execute (G)
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dw fill ;K SSSS FFFF DD fill RAM with "k"onstant
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dw hexLoad ;L P load Intel hex file from port
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dw moveb ;M SSSS FFFF DDDD move block
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dw ndmt ;N non destructive memory test (RAM size)
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dw poutp ;O PP DD output to port
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dw pgm ;P LLLL program memory
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dw chksum ;Q SSSS FFFF compute checksum
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dw ndmt ;R non destructive memory test (RAM size)
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dw srch1 ;S SSSS FFFF DD search for single byte
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dw tmem ;T SSSS FFFF test memory
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;--------------------------------------------------------------------------
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; exec (G or J) - execute the program at the address
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;--------------------------------------------------------------------------
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exec call dspMsg
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db 'GOT','O'+80h
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call ahex ;read address from keyboard
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xchg
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pchl
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;--------------------------------------------------------------------------
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; doBoot (B) - boot floppy disk by jumping to DBL PROM at FF00
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;--------------------------------------------------------------------------
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doBoot call dspMsg
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db 'BOO','T'+80h
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jmp BOOT
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;--------------------------------------------------------------------------
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; chksum (Q) - compute checksum
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;--------------------------------------------------------------------------
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chksum call dspMsg
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db 'CSU','M'+80h
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call tahex
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mvi b,0 ;start checksum = 0
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csloop mov a,m ;get data from memory
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add b ;add to checksum
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mov b,a
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call bmp
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jnz csloop ;repeat loop
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mov a,b ;a=checksum
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jmp pt2 ;print checksum and exit
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;--------------------------------------------------------------------------
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; tmem (T) - memory test routine
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;--------------------------------------------------------------------------
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tmem call dspMsg
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db 'TES','T'+80h
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call tahex ;read addresses
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lxi b,05a5ah ;init b,c
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cycl mvi a,'.' ;display '.' before each cycle
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call ptcn
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call rndm
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push b ;keep all registers
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push h
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push d
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tlop mov a,h ;on stack page?
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cpi (SPTR shr 8)-1 ;compare to msb of stack
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jz skipWr ;in stack, skip write
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call rndm
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mov m,b ;write in memory
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skipWr call bmp
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jnz tlop ;repeat loop
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pop d
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pop h ;restore original
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pop b ;values
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push h
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push d
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rlop mov a,h ;on stack page?
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cpi (SPTR shr 8)-1 ;compare to msb of stack
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jz skipRd ;in stack, skip the read
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call rndm ;generate new sequence
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mov a,m ;read memory
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cmp b ;compare memory
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cnz err ;call error routine
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skipRd call bmp
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jnz rlop
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pop d
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pop h
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call pause
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jmp cycl
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; rndm - this routine generates random numbers
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rndm mov a,b ;look at b
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ani 0b4h ;mask bits
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ana a ;clear carry
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jpe peve ;jump if even
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stc
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peve mov a,c ;look at c
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ral ;rotate carry in
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mov c,a ;restore c
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mov a,b ;look at b
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ral ;rotate carry in
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mov b,a ;restore b
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ret ;return with new b,c
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;--------------------------------------------------------------------------
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; disp (D) - display memory contents
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;--------------------------------------------------------------------------
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disp call dspMsg
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db 'DUM','P'+80h
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call tahex ;read addresses
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dmpLine push h ;save address at start of line
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mvi c,16 ;16 locations per line
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call ptad ;print current address
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; dump line in hex
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dmpHex mov a,m ;a=byte to display
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call pt2 ;display it
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call spce
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inx h
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dcr c ;decrement line byte count
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jnz dmpHex ;loop until 16 bytes done
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; dump line in ASCII
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call spce
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pop h ;hl->start of line
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mvi c,16 ;16 locations per line
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dmpAsc mov a,m ;a=byte to display
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cpi 7Fh ;test if >= 7Fh
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jnc dspDot ;non printable, show '.'
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cpi ' ' ;displayable character?
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jnc dspAsc ;yes, go display it
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dspDot mvi a,'.' ;display '.' instead
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dspAsc call ptcn ;display the character
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call bmp ;increment hl, possibly de
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dcr c ;decrement line byte count
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jnz dmpAsc ;loop until 16 bytes done
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call bmp ;done?
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rz ;yes
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dcx h ;undo extra bump of hl
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jmp dmpLine ;do another line
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;--------------------------------------------------------------------------
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; pgm (P) - program memory
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;--------------------------------------------------------------------------
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pgm call dspMsg
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db 'PG','M'+80h
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call ahex ;read address
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xchg
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call crlf
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pglp mov a,m ;read memory
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call pt2 ;print 2 digits
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mvi a,'-' ;load dash
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call ptcn ;print dash
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crig call rdcn ;get user input
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cpi ' ' ;space
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jz con2 ;skip if space
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cpi CR ;skip if CR
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jnz con1
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call crlf ;print CR,LF
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jmp crig ;back for more
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con1 xchg ;HL->DE
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lxi h,0 ;get 16 bit zero
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mvi c,2 ;count 2 digits
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call ahexNr ;convert to hex (no read)
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mov m,e
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con2 inx h
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jmp pglp
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;--------------------------------------------------------------------------
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; fill (K) - fill memory with a constant
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;--------------------------------------------------------------------------
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fill call dspMsg
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db 'FIL','L'+80h
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|
|
| 360 |
|
|
call tahex ;read addresses
|
| 361 |
|
|
push h ;start addr on stack
|
| 362 |
|
|
mvi c,2 ;reading 2 digits
|
| 363 |
|
|
call ahe0 ;input fill byte
|
| 364 |
|
|
xchg ;byte to write from e to l
|
| 365 |
|
|
xthl ;hl=start addr, stack=fill byte
|
| 366 |
|
|
pop b ;c=fill byte from stack
|
| 367 |
|
|
|
| 368 |
|
|
zloop mov m,c ;write into memory
|
| 369 |
|
|
call bmp ;compare address, increment h
|
| 370 |
|
|
rz
|
| 371 |
|
|
jmp zloop
|
| 372 |
|
|
|
| 373 |
|
|
;--------------------------------------------------------------------------
|
| 374 |
|
|
; moveb (M) - move a block of memory
|
| 375 |
|
|
; exchg (E) - exhange block of memory
|
| 376 |
|
|
;--------------------------------------------------------------------------
|
| 377 |
|
|
moveb call dspMsg
|
| 378 |
|
|
db 'MOV','E'+80h
|
| 379 |
|
|
xra a ;a=0 means "move" command
|
| 380 |
|
|
jmp doMove
|
| 381 |
|
|
|
| 382 |
|
|
exchg call dspMsg
|
| 383 |
|
|
db 'EXC','H'+80h
|
| 384 |
|
|
;a returned <> 0 means "exchange" command
|
| 385 |
|
|
|
| 386 |
|
|
doMove mov b,a ;save move/exchange flag in b
|
| 387 |
|
|
call tahex ;read addresses
|
| 388 |
|
|
push h
|
| 389 |
|
|
call ahex
|
| 390 |
|
|
xchg
|
| 391 |
|
|
xthl ;HL->start, DE->end, stack has dest
|
| 392 |
|
|
|
| 393 |
|
|
mloop mov c,m ;c=byte from source
|
| 394 |
|
|
xthl ;hl->destination
|
| 395 |
|
|
|
| 396 |
|
|
mov a,b ;move or exchange?
|
| 397 |
|
|
ora a
|
| 398 |
|
|
jz nexch ;0 means move only
|
| 399 |
|
|
|
| 400 |
|
|
mov a,m ;a=from destination
|
| 401 |
|
|
xthl ;hl->source
|
| 402 |
|
|
mov m,a ;move destination to source
|
| 403 |
|
|
xthl ;hl->destination
|
| 404 |
|
|
|
| 405 |
|
|
nexch mov m,c ;move source to destination
|
| 406 |
|
|
inx h ;increment destination
|
| 407 |
|
|
xthl ;hl->source
|
| 408 |
|
|
call bmp ;increment source and compare to end
|
| 409 |
|
|
jnz mloop
|
| 410 |
|
|
|
| 411 |
|
|
pop h ;remove temp pointer from stack
|
| 412 |
|
|
ret ;and exit
|
| 413 |
|
|
|
| 414 |
|
|
;--------------------------------------------------------------------------
|
| 415 |
|
|
; ndmt (N or R) - non destructive memory test (size RAM)
|
| 416 |
|
|
;--------------------------------------------------------------------------
|
| 417 |
|
|
ndmt call dspMsg
|
| 418 |
|
|
db 'RAMTO','P'+80h
|
| 419 |
|
|
|
| 420 |
|
|
lxi h,0ffffh ;start at zero
|
| 421 |
|
|
|
| 422 |
|
|
ndlop inx h
|
| 423 |
|
|
mov a,m ;read from address in hl
|
| 424 |
|
|
mov b,a ;save original value in b
|
| 425 |
|
|
cma ;form and write inverted value
|
| 426 |
|
|
mov m,a
|
| 427 |
|
|
cmp m ;read and compare
|
| 428 |
|
|
mov m,b ;restore original value
|
| 429 |
|
|
jz ndlop ;keep going if still RAM
|
| 430 |
|
|
|
| 431 |
|
|
jmp err ;display end of RAM
|
| 432 |
|
|
|
| 433 |
|
|
;--------------------------------------------------------------------------
|
| 434 |
|
|
; compr (C) - compare two blocks of memory
|
| 435 |
|
|
;--------------------------------------------------------------------------
|
| 436 |
|
|
compr call dspMsg
|
| 437 |
|
|
db 'COM','P'+80h
|
| 438 |
|
|
|
| 439 |
|
|
call tahex ;read addresses
|
| 440 |
|
|
push h ;source start on stack
|
| 441 |
|
|
call ahex
|
| 442 |
|
|
xchg ;de=source end, hl=compare start
|
| 443 |
|
|
|
| 444 |
|
|
vmlop mov a,m ;a=compare byte
|
| 445 |
|
|
inx h
|
| 446 |
|
|
xthl ;hl->source byte
|
| 447 |
|
|
cmp m ;same?
|
| 448 |
|
|
mov b,m ;b=source byte
|
| 449 |
|
|
cnz err ;display the error
|
| 450 |
|
|
call bmp ;increment pointers
|
| 451 |
|
|
xthl ;hl->compare byte
|
| 452 |
|
|
jnz vmlop
|
| 453 |
|
|
|
| 454 |
|
|
pop h ;remove temp pointer from stack
|
| 455 |
|
|
ret ;and exit
|
| 456 |
|
|
|
| 457 |
|
|
;--------------------------------------------------------------------------
|
| 458 |
|
|
; srch1 (S) - search for one byte
|
| 459 |
|
|
; srch2 (F) - search for two bytes
|
| 460 |
|
|
;--------------------------------------------------------------------------
|
| 461 |
|
|
srch1 call dspMsg
|
| 462 |
|
|
db 'FIND','1'+80h
|
| 463 |
|
|
xra a ;zero flag means one byte search
|
| 464 |
|
|
jmp doSrch
|
| 465 |
|
|
|
| 466 |
|
|
srch2 call dspMsg
|
| 467 |
|
|
db 'FIND','2'+80h
|
| 468 |
|
|
;a returned <> 0 means two byte search
|
| 469 |
|
|
|
| 470 |
|
|
doSrch push psw ;save 1/2 byte flag on stack
|
| 471 |
|
|
call tahex
|
| 472 |
|
|
|
| 473 |
|
|
push h ;save h, getting 1st byte to find
|
| 474 |
|
|
mvi c,2 ;reading 2 hex digits
|
| 475 |
|
|
call ahe0 ;
|
| 476 |
|
|
xchg ;h=code, d=f
|
| 477 |
|
|
mov b,l ;put code in b
|
| 478 |
|
|
pop h ;restore h
|
| 479 |
|
|
|
| 480 |
|
|
pop psw ;a=one/two byte flag
|
| 481 |
|
|
ora a ;zero true if one byte search
|
| 482 |
|
|
push psw
|
| 483 |
|
|
jz cont
|
| 484 |
|
|
|
| 485 |
|
|
push h ;save h, getting 2nd byte to find
|
| 486 |
|
|
mvi c,2
|
| 487 |
|
|
call ahe0
|
| 488 |
|
|
xchg
|
| 489 |
|
|
mov c,l
|
| 490 |
|
|
pop h
|
| 491 |
|
|
|
| 492 |
|
|
cont mov a,m ;read memory
|
| 493 |
|
|
cmp b ;compare to code
|
| 494 |
|
|
jnz skp ;skip if no compare
|
| 495 |
|
|
|
| 496 |
|
|
pop psw ;a=one/two byte flag
|
| 497 |
|
|
ora a ;zero true if one byte serach
|
| 498 |
|
|
push psw
|
| 499 |
|
|
jz obcp
|
| 500 |
|
|
|
| 501 |
|
|
inx h ;two byte search
|
| 502 |
|
|
mov a,m
|
| 503 |
|
|
dcx h
|
| 504 |
|
|
cmp c
|
| 505 |
|
|
jnz skp
|
| 506 |
|
|
|
| 507 |
|
|
obcp inx h
|
| 508 |
|
|
mov a,m ;read next byte
|
| 509 |
|
|
dcx h ;decr address
|
| 510 |
|
|
call err ;print data found
|
| 511 |
|
|
|
| 512 |
|
|
skp call bmp ;check if done
|
| 513 |
|
|
jnz cont ;back for more
|
| 514 |
|
|
pop psw ;remove flag saved on stack
|
| 515 |
|
|
ret
|
| 516 |
|
|
|
| 517 |
|
|
;--------------------------------------------------------------------------
|
| 518 |
|
|
; poutp (O) - output data to a port
|
| 519 |
|
|
;--------------------------------------------------------------------------
|
| 520 |
|
|
poutp call dspMsg
|
| 521 |
|
|
db 'OU','T'+80h
|
| 522 |
|
|
|
| 523 |
|
|
mvi c,2
|
| 524 |
|
|
call ahe0 ;port number in e
|
| 525 |
|
|
|
| 526 |
|
|
mvi c,2
|
| 527 |
|
|
call ahe0 ;port to l, data in e
|
| 528 |
|
|
|
| 529 |
|
|
mov d,l ;d=port
|
| 530 |
|
|
lxi h,SPTR-30h ;form OUT nn, RET in memory at h
|
| 531 |
|
|
mvi m,0c9h ;RET opcode
|
| 532 |
|
|
dcx h
|
| 533 |
|
|
mov m,d ;output port for OUT instruction
|
| 534 |
|
|
dcx h
|
| 535 |
|
|
mvi m,0D3H ;OUT opcode
|
| 536 |
|
|
mov a,e
|
| 537 |
|
|
pchl ;call OUT, RET
|
| 538 |
|
|
|
| 539 |
|
|
;--------------------------------------------------------------------------
|
| 540 |
|
|
; pinpt (I) - input data from a port
|
| 541 |
|
|
;--------------------------------------------------------------------------
|
| 542 |
|
|
pinpt call dspMsg
|
| 543 |
|
|
db 'I','N'+80h
|
| 544 |
|
|
|
| 545 |
|
|
mvi c,2
|
| 546 |
|
|
call ahe0 ;port number to e
|
| 547 |
|
|
|
| 548 |
|
|
lxi h,SPTR-30H ;form IN nn, RET in memory at h
|
| 549 |
|
|
mvi m,0C9H ;RET opcode
|
| 550 |
|
|
dcx h
|
| 551 |
|
|
mov m,e ;input port of IN instruction
|
| 552 |
|
|
dcx h
|
| 553 |
|
|
mvi m,0DBH ;IN opcode
|
| 554 |
|
|
call SPTR-32H
|
| 555 |
|
|
jmp pt2
|
| 556 |
|
|
|
| 557 |
|
|
;---------------------------------------------------------------------
|
| 558 |
|
|
; hexLoad (H or L) - load intel hex through 2SIO serial port 0 or 1
|
| 559 |
|
|
;---------------------------------------------------------------------
|
| 560 |
|
|
hexload call dspMsg
|
| 561 |
|
|
db 'HEXLOA','D'+80h
|
| 562 |
|
|
|
| 563 |
|
|
mvi c,1 ;read one hex digit
|
| 564 |
|
|
call ahe0 ;digit is in e
|
| 565 |
|
|
lxi h,SIOPORT ;hl->location on stack to save port
|
| 566 |
|
|
mov m,e ;SIOPORT = 0 or 1
|
| 567 |
|
|
|
| 568 |
|
|
; rcvLine - receive a hex file line
|
| 569 |
|
|
|
| 570 |
|
|
rcvLine call crlf
|
| 571 |
|
|
mvi c,0 ;clear echo character flag
|
| 572 |
|
|
|
| 573 |
|
|
wtMark call getChar ;read next character
|
| 574 |
|
|
sui ':' ;record marker?
|
| 575 |
|
|
jnz wtMark ;no, keep looking
|
| 576 |
|
|
|
| 577 |
|
|
; Have start of new record. Save the byte count and load address.
|
| 578 |
|
|
; The load address is echoed to the screen so the user can
|
| 579 |
|
|
; see the file load progress.
|
| 580 |
|
|
|
| 581 |
|
|
mov d,a ;init checksum in D to zero
|
| 582 |
|
|
|
| 583 |
|
|
call iByte ;input two hex digits (byte count)
|
| 584 |
|
|
mov a,e ;test for zero byte count
|
| 585 |
|
|
ora a
|
| 586 |
|
|
jz flush ;count of 0 means end
|
| 587 |
|
|
|
| 588 |
|
|
mov b,e ;B = byte count on line
|
| 589 |
|
|
|
| 590 |
|
|
inr c ;set echo flag for address bytes
|
| 591 |
|
|
call iByte ;get MSB of address
|
| 592 |
|
|
mov h,e ;H = address MSB
|
| 593 |
|
|
call iByte ;get LSB of address
|
| 594 |
|
|
mov l,e ;L = address LSB
|
| 595 |
|
|
dcr c ;clear echo flag
|
| 596 |
|
|
|
| 597 |
|
|
call iByte ;ignore/discard record type
|
| 598 |
|
|
|
| 599 |
|
|
; Receive the data bytes of the record and move to memory
|
| 600 |
|
|
|
| 601 |
|
|
data call iByte ;read a data byte (2 hex digits)
|
| 602 |
|
|
mov m,e ;store in memory
|
| 603 |
|
|
inx h
|
| 604 |
|
|
dcr b
|
| 605 |
|
|
jnz data
|
| 606 |
|
|
|
| 607 |
|
|
; Validate checksum
|
| 608 |
|
|
|
| 609 |
|
|
call iByte ;read and add checksum
|
| 610 |
|
|
jz rcvLine ;checksum good, receive next line
|
| 611 |
|
|
|
| 612 |
|
|
call dspMsg ;display error message
|
| 613 |
|
|
db ' ER','R'+80h
|
| 614 |
|
|
;fall into flush
|
| 615 |
|
|
|
| 616 |
|
|
; flush - flush rest of file as it comes in until no characters
|
| 617 |
|
|
; received for about 1/4 second to prevent incoming file
|
| 618 |
|
|
; data looking like typed monitor commands. Only the console
|
| 619 |
|
|
; port needs to be flushed.
|
| 620 |
|
|
|
| 621 |
|
|
flush in COND ;clear possible received char
|
| 622 |
|
|
lxi d,10417 ;.25s timeout for 48 cycle loop
|
| 623 |
|
|
|
| 624 |
|
|
flshLp in CONS ;(10) look for character on console
|
| 625 |
|
|
rrc ;(4) data flag in carry
|
| 626 |
|
|
jc flush ;(10) data received, restart
|
| 627 |
|
|
|
| 628 |
|
|
dcx d ;(5) decrement timeout
|
| 629 |
|
|
mov a,d ;(5)
|
| 630 |
|
|
ora e ;(4)
|
| 631 |
|
|
jnz flshLp ;(10) loop until zero
|
| 632 |
|
|
ret ;done
|
| 633 |
|
|
|
| 634 |
|
|
;-----------------------------------------------------------
|
| 635 |
|
|
; iByte - read two ascii hex bytes and return binary
|
| 636 |
|
|
; value in e.
|
| 637 |
|
|
;-----------------------------------------------------------
|
| 638 |
|
|
iByte call getChar ;get a character
|
| 639 |
|
|
call asc2Bin ;ascii hex digit to binary
|
| 640 |
|
|
add a ;put in msn, zero lsn
|
| 641 |
|
|
add a
|
| 642 |
|
|
add a
|
| 643 |
|
|
add a
|
| 644 |
|
|
mov e,a ;save byte with MSN in E
|
| 645 |
|
|
|
| 646 |
|
|
; 2nd byte (LSN)
|
| 647 |
|
|
|
| 648 |
|
|
call getChar ;get a character
|
| 649 |
|
|
call asc2Bin ;ascii hex digit to binary
|
| 650 |
|
|
add e ;combine msn and lsn
|
| 651 |
|
|
mov e,a ;save in EH
|
| 652 |
|
|
add d ;add character to checksum
|
| 653 |
|
|
mov d,a
|
| 654 |
|
|
ret
|
| 655 |
|
|
|
| 656 |
|
|
;-------------------------------------------------------------
|
| 657 |
|
|
; asc2Bin - ASCII hex digit to binary conversion. Digit
|
| 658 |
|
|
; passed in a, returned in a. Errors ignored as checksum
|
| 659 |
|
|
; will eventually kick this out.
|
| 660 |
|
|
;-------------------------------------------------------------
|
| 661 |
|
|
asc2Bin sui '0' ;'0' to 0
|
| 662 |
|
|
cpi 10 ;0-9 ?
|
| 663 |
|
|
rc
|
| 664 |
|
|
|
| 665 |
|
|
sui 7 ;'A-F' to A-F
|
| 666 |
|
|
ret
|
| 667 |
|
|
|
| 668 |
|
|
;-------------------------------------------------------------
|
| 669 |
|
|
; getChar - read a character from the 2SIO port specified in
|
| 670 |
|
|
; SIOPORT. The character is also echoed to the console port
|
| 671 |
|
|
; if the echo flag (c) is set (non-zero)
|
| 672 |
|
|
;-------------------------------------------------------------
|
| 673 |
|
|
getChar push b ;save b,c
|
| 674 |
|
|
lda SIOPORT ;a=pseudo port to use
|
| 675 |
|
|
ora a ;port zero?
|
| 676 |
|
|
jnz inWait1 ;no, use port 1
|
| 677 |
|
|
|
| 678 |
|
|
; in through 1st port (0) on 2SIO
|
| 679 |
|
|
|
| 680 |
|
|
inWait0 call cntlc ;test for character from console
|
| 681 |
|
|
jz inWait0
|
| 682 |
|
|
jmp haveChr
|
| 683 |
|
|
|
| 684 |
|
|
; in through 2nd port (1) on 2SIO, check for ctrl-c on console
|
| 685 |
|
|
; while waiting
|
| 686 |
|
|
|
| 687 |
|
|
inWait1 call cntlc ;look for ctrl-c on console
|
| 688 |
|
|
in CONS+2 ;wait for character on 2nd 2SIO
|
| 689 |
|
|
rrc ;data flag in carry
|
| 690 |
|
|
jnc inWait1
|
| 691 |
|
|
in COND+2 ;a=character read
|
| 692 |
|
|
|
| 693 |
|
|
; process new character in a. Echo to console if c is non-zero
|
| 694 |
|
|
|
| 695 |
|
|
haveChr mov b,a ;save character in b
|
| 696 |
|
|
mov a,c ;echo flag (c) set?
|
| 697 |
|
|
ora a
|
| 698 |
|
|
jz noEcho ;no echo
|
| 699 |
|
|
|
| 700 |
|
|
mov a,b ;a=character to send
|
| 701 |
|
|
pop b ;restore b,c
|
| 702 |
|
|
jmp ptcn ;display character and exit
|
| 703 |
|
|
|
| 704 |
|
|
noEcho mov a,b ;a=byte read
|
| 705 |
|
|
pop b ;restore b,c
|
| 706 |
|
|
ret
|
| 707 |
|
|
|
| 708 |
|
|
;********************************************************************
|
| 709 |
|
|
;
|
| 710 |
|
|
; Type conversion, input, output subroutines
|
| 711 |
|
|
;
|
| 712 |
|
|
;********************************************************************
|
| 713 |
|
|
|
| 714 |
|
|
;------------------------------------------------------------
|
| 715 |
|
|
; tahex - read two 16 bit addresses. 1st returned in HL, 2nd in DE
|
| 716 |
|
|
;------------------------------------------------------------
|
| 717 |
|
|
tahex call ahex ;get first address param
|
| 718 |
|
|
;fall into ahex to get 2nd param
|
| 719 |
|
|
|
| 720 |
|
|
;------------------------------------------------------------
|
| 721 |
|
|
; ahex - read up to 4 hex digits to binary, return in de
|
| 722 |
|
|
;------------------------------------------------------------
|
| 723 |
|
|
ahex mvi c,4 ;count of 4 digits
|
| 724 |
|
|
ahe0 lxi h,0 ;16 bit zero
|
| 725 |
|
|
ahe1 call rdcn ;read a byte
|
| 726 |
|
|
ahexNr cpi '0'
|
| 727 |
|
|
jc start ;below '0', abort
|
| 728 |
|
|
cpi ':'
|
| 729 |
|
|
cnc alph
|
| 730 |
|
|
dad h
|
| 731 |
|
|
dad h
|
| 732 |
|
|
dad h
|
| 733 |
|
|
dad h
|
| 734 |
|
|
sui '0' ;ascii bias
|
| 735 |
|
|
cpi 10 ;digit 0-10
|
| 736 |
|
|
jc alf
|
| 737 |
|
|
sui 7 ;alpha bias
|
| 738 |
|
|
alf add l
|
| 739 |
|
|
mov l,a
|
| 740 |
|
|
dcr c
|
| 741 |
|
|
jnz ahe1 ;keep reading
|
| 742 |
|
|
xchg ;result in de
|
| 743 |
|
|
;fall through to print a space
|
| 744 |
|
|
;------------------------------------------------------------
|
| 745 |
|
|
; spce - print a space
|
| 746 |
|
|
; ptcn - print character passed in a
|
| 747 |
|
|
;------------------------------------------------------------
|
| 748 |
|
|
spce mvi a,' ' ;print space
|
| 749 |
|
|
ptcn push psw
|
| 750 |
|
|
|
| 751 |
|
|
ptlop in CONS ;wait for OK to transmit
|
| 752 |
|
|
ani TBE
|
| 753 |
|
|
jz ptlop
|
| 754 |
|
|
|
| 755 |
|
|
pop psw ;recover a
|
| 756 |
|
|
ani 07fh ;get rid of msbit
|
| 757 |
|
|
out COND ;and print it
|
| 758 |
|
|
ret ;return from ptcn
|
| 759 |
|
|
|
| 760 |
|
|
;------------------------------------------------------------
|
| 761 |
|
|
; alph - verify valid hex digit, abort to command loop if not
|
| 762 |
|
|
;------------------------------------------------------------
|
| 763 |
|
|
alph cpi 'A'
|
| 764 |
|
|
jc start
|
| 765 |
|
|
ani 05fh
|
| 766 |
|
|
cpi 'G'
|
| 767 |
|
|
jnc start
|
| 768 |
|
|
ret
|
| 769 |
|
|
|
| 770 |
|
|
;------------------------------------------------------------
|
| 771 |
|
|
; crlf - print CR/LF
|
| 772 |
|
|
;------------------------------------------------------------
|
| 773 |
|
|
crlf mvi a,CR
|
| 774 |
|
|
call ptcn
|
| 775 |
|
|
mvi a,LF
|
| 776 |
|
|
jmp ptcn
|
| 777 |
|
|
|
| 778 |
|
|
;------------------------------------------------------------
|
| 779 |
|
|
; err - display the address in hl followed by the value
|
| 780 |
|
|
; in b, then the value in a.
|
| 781 |
|
|
;------------------------------------------------------------
|
| 782 |
|
|
err push psw ;save A
|
| 783 |
|
|
call ptad ;print address
|
| 784 |
|
|
mov a,b ;print B
|
| 785 |
|
|
call pt2
|
| 786 |
|
|
call spce
|
| 787 |
|
|
pop psw ;print A
|
| 788 |
|
|
pt2 push psw
|
| 789 |
|
|
call binh
|
| 790 |
|
|
pop psw
|
| 791 |
|
|
jmp binl
|
| 792 |
|
|
|
| 793 |
|
|
;------------------------------------------------------------
|
| 794 |
|
|
; ptad - display the address in h
|
| 795 |
|
|
;------------------------------------------------------------
|
| 796 |
|
|
ptad call crlf ;print cr,lf
|
| 797 |
|
|
call pause
|
| 798 |
|
|
mov a,h ;print
|
| 799 |
|
|
call pt2 ;ascii
|
| 800 |
|
|
mov a,l ;codes
|
| 801 |
|
|
call pt2 ;for
|
| 802 |
|
|
call spce ;address
|
| 803 |
|
|
ret
|
| 804 |
|
|
|
| 805 |
|
|
;------------------------------------------------------------
|
| 806 |
|
|
; binh - print MSN of byte passed in A
|
| 807 |
|
|
; binl - print LSN of byte passed in A
|
| 808 |
|
|
;------------------------------------------------------------
|
| 809 |
|
|
binh rar
|
| 810 |
|
|
rar
|
| 811 |
|
|
rar
|
| 812 |
|
|
rar
|
| 813 |
|
|
binl ani 0fh ;low 4 bits
|
| 814 |
|
|
adi '0' ;ascii bias
|
| 815 |
|
|
cpi 03ah ;digit 0-9
|
| 816 |
|
|
jc ptcn
|
| 817 |
|
|
adi 7 ;digit A-F
|
| 818 |
|
|
jmp ptcn
|
| 819 |
|
|
|
| 820 |
|
|
;------------------------------------------------------------
|
| 821 |
|
|
; dspMsg - display in-line message. String terminated by byte
|
| 822 |
|
|
; with msbit set.
|
| 823 |
|
|
;------------------------------------------------------------
|
| 824 |
|
|
dspMsg pop h ;hl->string to display
|
| 825 |
|
|
|
| 826 |
|
|
dspLoop mov a,m ;a=next character to display
|
| 827 |
|
|
call ptcn ;display character
|
| 828 |
|
|
ora m ;MSB set? (last byte)
|
| 829 |
|
|
inx h ;point to next character
|
| 830 |
|
|
jp dspLoop ;no, keep looping
|
| 831 |
|
|
|
| 832 |
|
|
call spce ;display a trailing space
|
| 833 |
|
|
pchl ;return past the string
|
| 834 |
|
|
|
| 835 |
|
|
;------------------------------------------------------------
|
| 836 |
|
|
; rdcn - read from console to A with echo to screen
|
| 837 |
|
|
; getCon - read from console to A without echo
|
| 838 |
|
|
;------------------------------------------------------------
|
| 839 |
|
|
rdcn call getCon ;get character from console
|
| 840 |
|
|
cpi ESC ;ESC confuses smart terminals
|
| 841 |
|
|
rz ; so don't echo escape
|
| 842 |
|
|
jmp ptcn ;echo onto printer
|
| 843 |
|
|
|
| 844 |
|
|
getCon in CONS ;read keyboard status
|
| 845 |
|
|
rrc ;data available flag in carry
|
| 846 |
|
|
jnc getCon
|
| 847 |
|
|
|
| 848 |
|
|
in COND ;read from keyboard
|
| 849 |
|
|
ani 07fh ;strip off msb
|
| 850 |
|
|
ret
|
| 851 |
|
|
|
| 852 |
|
|
;------------------------------------------------------------
|
| 853 |
|
|
; pause - pause/resume with spacebar. Also look for a ctrl-c
|
| 854 |
|
|
; or ESC to abort.
|
| 855 |
|
|
;------------------------------------------------------------
|
| 856 |
|
|
pause call cntlc ;look for abort or other character
|
| 857 |
|
|
cpi ' '
|
| 858 |
|
|
rnz ;return if not space or abort
|
| 859 |
|
|
|
| 860 |
|
|
ploop call cntlc ;loop here until space or abort pressed
|
| 861 |
|
|
cpi ' '
|
| 862 |
|
|
jnz ploop
|
| 863 |
|
|
ret
|
| 864 |
|
|
|
| 865 |
|
|
;------------------------------------------------------------
|
| 866 |
|
|
; cntlc - see if a character has been typed. If not, return
|
| 867 |
|
|
; zero true. If ctrl-c or ESC typed, abort and return to
|
| 868 |
|
|
; the command loop. Otherwise, return the character typed.
|
| 869 |
|
|
;------------------------------------------------------------
|
| 870 |
|
|
cntlc in CONS ;anything typed?
|
| 871 |
|
|
ani RDA
|
| 872 |
|
|
rz ;no, exit with zero true
|
| 873 |
|
|
|
| 874 |
|
|
in COND ;get the typed character
|
| 875 |
|
|
ani 07fh
|
| 876 |
|
|
cpi CTRLC ;abort with ctrl-c (2.0 style)
|
| 877 |
|
|
jz start
|
| 878 |
|
|
cpi ESC ;or ESC (4.x style)
|
| 879 |
|
|
jz start
|
| 880 |
|
|
ret
|
| 881 |
|
|
|
| 882 |
|
|
;------------------------------------------------------------
|
| 883 |
|
|
; bmp - compare address and increment h. Return zero true
|
| 884 |
|
|
; if hl=de. Once hl=de, then de is incremented each time
|
| 885 |
|
|
; so the comparison remains true for subsequent calls.
|
| 886 |
|
|
;------------------------------------------------------------
|
| 887 |
|
|
bmp mov a,e ;compare lsb's of hl,de
|
| 888 |
|
|
sub l
|
| 889 |
|
|
jnz goon ;not equal
|
| 890 |
|
|
|
| 891 |
|
|
mov a,d ;compare msb's of hl,de
|
| 892 |
|
|
sbb h ;gives zero true if equal
|
| 893 |
|
|
|
| 894 |
|
|
goon inx h ;increment hl
|
| 895 |
|
|
rnz ;exit if hl <> de yet
|
| 896 |
|
|
|
| 897 |
|
|
inx d ;increase de as well so it will
|
| 898 |
|
|
ret ; still be equal next time
|
| 899 |
|
|
|
| 900 |
|
|
end
|
