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dilbert57 |
Assembler release DWC_2.0 version 2.11
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May 6, 2004 (c) Motorola (free ware)
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0001 *******************************************************
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0002 *
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0003 * Bootstrap FLEX Loader
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0004 *
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0005 * SBUG1.8 loads the bootstap loader at $C000
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0006 * however the Flex adaption manual has the
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0007 * bootstrap loader residing at $C100
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0008 *
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0009 ******************************************************
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0010 *
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0011 * Equates
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0012 *
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0013 C0FF STACK EQU $C0FF
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0014 C300 SCTBUF EQU $C300
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0015 *
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0016 * Start of Utility
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0017 *
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0018 C000 ORG $C000
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0019 C000 20 0B BOOT BRA LOAD0
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0020 C002 00 00 00 FCB 0,0,0
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0021 C005 00 TRK FCB 0 File start track
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0022 C006 00 SCT FCB 0 File start sector
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0023 C007 00 DNS FCB 0 Density Flag (not used)
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0024 C008 C0 00 TADR FDB $C000 Transfer address
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0025 C00A 00 00 LADR FDB 0 Load Address
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0026 C00C 00 DRVNUM FCB 0 Drive number 0
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0027 *
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0028 C00D 10 CE C0 FF LOAD0 LDS #STACK Set up stack
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0029 C011 FC C0 05 LDD TRK Set up start track and sector
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0030 C014 FD C3 00 STD SCTBUF
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0031 C017 10 8E C4 00 LDY #SCTBUF+256
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0032 *
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0033 * Perform actual file load
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0034 *
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0035 C01B 8D 35 LOAD1 BSR GETCH Get acharcater
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0036 C01D 81 02 CMPA #$02 Data record hearder ?
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0037 C01F 27 10 BEQ LOAD2 Skip, is so
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0038 C021 81 16 CMPA #$16 Xfr address hearder ?
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0039 C023 26 F6 BNE LOAD1 Loop if neither
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0040 *
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0041 * Get transfer address
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0042 *
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0043 C025 8D 2B BSR GETCH
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0044 C027 B7 C0 08 STA TADR
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0045 C02A 8D 26 BSR GETCH
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0046 C02C B7 C0 09 STA TADR+1
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0047 C02F 20 EA BRA LOAD1
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0048 *
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0049 * Load data record
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0050 *
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0051 C031 8D 1F LOAD2 BSR GETCH Get load address
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0052 C033 B7 C0 0A STA LADR
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0053 C036 8D 1A BSR GETCH
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0054 C038 B7 C0 0B STA LADR+1
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0055 C03B 8D 15 BSR GETCH Get Bytes count
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0056 C03D 1F 89 TFR A,B
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0057 C03F 5D TSTB
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0058 C040 27 D9 BEQ LOAD1 Loop if count = 0
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0059 C042 BE C0 0A LDX LADR Get load address
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0060 C045 34 14 LOAD3 PSHS B,X
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0061 C047 8D 09 BSR GETCH Get data character
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0062 C049 35 14 PULS B,X
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0063 C04B A7 80 STA ,X+ Store at load address
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0064 C04D 5A DECB
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0065 C04E 26 F5 BNE LOAD3 Loop until count = 0
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0066 C050 20 C9 BRA LOAD1
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0067 *
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0068 * Get Character routine
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0069 * Reads a sector if needed
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0070 *
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0071 C052 10 8C C4 00 GETCH CMPY #SCTBUF+256 out of data ?
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0072 C056 26 0F BNE GETCH4 Go read Character if not
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0073 C058 8E C3 00 GETCH2 LDX #SCTBUF Point to buffer
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0074 C05B EC 84 LDD 0,X Get forward Link
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0075 C05D 27 0B BEQ GO if zero, file is loaded
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0076 C05F 8D 27 BSR READ Read next sector
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0077 C061 26 9D BNE BOOT start over if error
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0078 C063 10 8E C3 04 LDY #SCTBUF+4 Point past link
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0079 C067 A6 A0 GETCH4 LDA ,Y+ Else, get a character
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0080 C069 39 RTS
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0081 *
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0082 * File is loaded, Jump to it
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0083 *
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0084 C06A 6E 9F C0 08 GO JMP [TADR] Jump to transfer address
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0085
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0086 *
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0087 ** FLEX 9 COMPACT FLASH DISK DRIVERS
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0088 *
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0089 * FOR SYS09BUG 1.2 ON THE BURCHED B5-X300
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0090 * WITH I/O MAPPED AT $XE000
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0091 * AND ROM MAPPED AT $XF000
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0092 * THE BURCHED B5-X300 HAS 256KBYTES OF SRAM
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0093 * THE FIRST 64K IS USED BY FLEX,
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0094 * THE SECOND 192K MAY BE USED AS A RAM DISK
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0095 *
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0096 *
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0097 0010 IMASK EQU $10 IRQ MASK CC
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0098 0040 FMASK EQU $40 FIRQ MASK CC
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0099 FFF0 DATREG EQU $FFF0 DAT REGISTERS
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0100 *
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0101 E040 CF_BASE EQU $E040
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0102 E040 CF_DATA EQU CF_BASE+0
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0103 E041 CF_ERROR EQU CF_BASE+1 ; read error
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0104 E041 CF_FEATURE EQU CF_BASE+1 ; write feature
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0105 E042 CF_SECCNT EQU CF_BASE+2
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0106 E043 CF_SECNUM EQU CF_BASE+3
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0107 E044 CF_CYLLO EQU CF_BASE+4
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0108 E045 CF_CYLHI EQU CF_BASE+5
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0109 E046 CF_HEAD EQU CF_BASE+6
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0110 E047 CF_STATUS EQU CF_BASE+7 ; read status
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0111 E047 CF_COMAND EQU CF_BASE+7 ; write command
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0112 *
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0113 * Command Equates
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0114 *
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0115 0020 CMDREAD EQU $20 ; Read Single sector
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0116 0030 CMDWRITE EQU $30 ; Write Single sector
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0117 00EF CMDFEATURE EQU $EF
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0118 0001 FEAT8BIT EQU $01 ; enable 8 bit transfers
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0119 00E0 HEADLBA EQU $E0
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0120 *
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0121 * Status bit equates
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0122 *
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0123 0080 BSY EQU $80
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0124 0040 DRDY EQU $40
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0125 0008 DRQ EQU $08
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0126 0001 ERR EQU $01
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0127 *
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0128 * RESTORE DISK DRIVER (SEEK TRACK 00)
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0129 *
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0130 C06E 7F C0 0C RESTR1 CLR DRVNUM
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0131 C071 4F CLRA ; Track 0
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0132 C072 C6 01 LDB #$01 ; Sector 1
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0133 *
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0134 * Seek track and sector
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0135 * A holds track number (0 - ??)
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0136 * B holds sector number (1 - ??)
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0137 * Sector numbers starts from 1
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0138 * subtract 1 to start from sector 0 on CF
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0139 *
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0140 C074 5A SEEKTS DECB
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0141 C075 F7 E0 43 STB CF_SECNUM
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0142 C078 B7 E0 44 STA CF_CYLLO
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0143 C07B F6 C0 0C LDB DRVNUM
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0144 C07E F7 E0 45 STB CF_CYLHI
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0145 C081 C6 01 LDB #$01
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0146 C083 F7 E0 42 STB CF_SECCNT
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0147 C086 5F CLRB
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0148 C087 39 WARMD1 RTS
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0149 *
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0150 * READ SECTORS FROM CF
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0151 *
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0152 *
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0153 C088 8D EA READ BSR SEEKTS
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0154 C08A 86 20 LDA #CMDREAD ; IDE READ MULTIPLE
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0155 C08C B7 E0 47 STA CF_COMAND
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0156 C08F 8D 18 BSR WAITRDY
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0157 *
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0158 * READ LOOP
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0159 *
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0160 C091 5F CLRB
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0161 C092 8D 24 RDLP1 BSR WAITDRQ
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0162 C094 B6 E0 40 LDA CF_DATA
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0163 C097 A7 80 STA ,X+
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0164 C099 5A DECB
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0165 C09A 26 F6 BNE RDLP1
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0166 *
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0167 C09C 5F CLRB
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0168 C09D 8D 19 RDLP2 BSR WAITDRQ
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0169 C09F B6 E0 40 LDA CF_DATA
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0170 C0A2 5A DECB
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0171 C0A3 26 F8 BNE RDLP2
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0172 *
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0173 C0A5 8D 02 BSR WAITRDY
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0174 C0A7 5F CLRB
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0175 C0A8 39 RTS
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0176 *
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0177 * WAIT UNTIL READY
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0178 *
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0179 C0A9 B6 E0 47 WAITRDY LDA CF_STATUS
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0180 C0AC 85 80 BITA #BSY
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0181 C0AE 26 F9 BNE WAITRDY
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0182 C0B0 B6 E0 47 LDA CF_STATUS
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0183 C0B3 85 40 BITA #DRDY
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0184 C0B5 27 F2 BEQ WAITRDY
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0185 C0B7 39 RTS
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0186 *
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0187 * WAIT FOR DATA REQUEST
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0188 *
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0189 C0B8 B6 E0 47 WAITDRQ LDA CF_STATUS
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0190 C0BB 85 08 BITA #DRQ
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0191 C0BD 27 F9 BEQ WAITDRQ
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0192 C0BF 39 RTS
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0193 *
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0194 END
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Program + Init Data = 192 bytes
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Error count = 0
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