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Assembler release DWC_2.0 version 2.11
May 6, 2004 (c) Motorola (free ware)
0001 *
0002 ** FLEX 9 COMPACT FLASH FORMAT PROGRAM
0003 *
0004 * FOR B5-X300 and CF with 8 Bit Transfer interface
0005 *
0006 *
0007 0001 CFLAG EQU $01 CARRY FLAG
0008 0002 VFLAG EQU $02 OVERFLOW FLAG
0009 0004 ZFLAG EQU $04 ZERO FLAG
0010 0008 NFLAG EQU $08 NEGATIVE FLAG
0011 0010 IFLAG EQU $10 IRQ MASK CC
0012 0020 HFLAG EQU $20 HALF CARRY
0013 0040 FFLAG EQU $40 FIRQ MASK CC
0014 0080 EFLAG EQU $80 ENTIRE FLAG
0015 *
0016 0000 MAPPAG EQU $00 PAGE $0000 DAT ADDRESS
0017 *
0018 * Serial Port
0019 *
0020 E000 ACIAS EQU $E000
0021 E000 ACIAC1 EQU ACIAS
0022 E001 ACIAD1 EQU ACIAS+1
0023 04E2 DELCON EQU 1250 Delay (Processor clock in MHz * 50)
0024 *
0025 * XMODEM Control characters
0026 *
0027 0001 SOH EQU $01
0028 0004 EOT EQU $04
0029 0006 ACK EQU $06
0030 0015 NAK EQU $15
0031 0018 CAN EQU $18
0032 *
0033 * Some dummy Constants
0034 *
0035 0040 RMAXTRK EQU 64
0036 00FF RMAXSEC EQU 255
0037 3EC1 RTOTSEC EQU RMAXTRK*RMAXSEC-RMAXSEC
0038 *
0039 * Start
0040 *
0041 0100 ORG $0100
0042 0100 17 02 9E START LBSR UFSUB
0043 0103 6E 9F F8 00 JMP [$F800] Jump to monitor on Completion.
0044 *
0045 *
0046 * RAM SPACE
0047 *
0048 0107 00 DRVNUM FCB 0
0049 0108 00 TRACK FCB 0
0050 0109 00 SECTOR FCB 0
0051 010A 00 CHKSUM FCB 0
0052 010B 00 BLKNUM FCB 0 Xmodem block number
0053 010C 00 BYTCNT FCB 0 Xmodem byte count
0054 010D 00 00 XSTATE FDB 0 Xmodem State Vector
0055 010F 00 00 00 DELCNT FCB $00,$00,$00 Xmodem Poll timer
0056 0112 00 MAXTRK FCB 0
0057 0113 00 MAXSEC FCB 0
0058 0200 ORG $0200
0059 *
0060 * SECTOR BUFFER
0061 *
0062 0200 BUFFER RMB 256
0063 *
0064 *
0065 * recieve char from remote drive.
0066 * timeout if no response for approx 1s.
0067 * Entry: no parameters
0068 * Exit: (A) = recieved char, (C)=1 if valid char, (C)=0 if timeout.
0069 *
0070 0300 34 30 RCHAR PSHS X,Y
0071 *
0072 0302 8E 03 E8 LDX #1000 1000x inner loop
0073 0305 10 8E 04 E2 RCHAR1 LDY #DELCON delay constant for inner loop (approx 1ms).
0074 0309 B6 E0 00 RCHAR2 LDA ACIAC1 test for recieved char
0075 030C 47 ASRA
0076 030D 25 0A BCS RCHAR3 get character
0077 030F 31 3F LEAY -1,Y else, continue to count delay
0078 0311 26 F6 BNE RCHAR2
0079 0313 30 1F LEAX -1,X
0080 0315 26 EE BNE RCHAR1
0081 0317 35 B0 PULS X,Y,PC return with error if timed out
0082 *
0083 0319 B6 E0 01 RCHAR3 LDA ACIAD1 return data (carry bit still set)
0084 031C 35 B0 PULS X,Y,PC
0085 *
0086 *
0087 * transmit char to remote drive.
0088 * timeout if no response for approx 1s. (allows for use of hardware flow control)
0089 * Entry: (A) = char to transmit
0090 * Exit: (A) = recieved char, (C)=1 if valid char, (C)=0 if timeout.
0091 *
0092 031E 34 30 SCHAR PSHS X,Y
0093 0320 34 02 PSHS A
0094 *
0095 0322 8E 03 E8 LDX #1000 1000x inner loop
0096 0325 10 8E 04 E2 SCHAR1 LDY #DELCON delay constant for inner loop (approx 1ms).
0097 0329 B6 E0 00 SCHAR2 LDA ACIAC1 test for space in transmit FIFO
0098 032C 47 ASRA
0099 032D 47 ASRA
0100 032E 25 0C BCS SCHAR3 send character
0101 0330 31 3F LEAY -1,Y else, continue to count delay
0102 0332 26 F5 BNE SCHAR2
0103 0334 30 1F LEAX -1,X
0104 0336 26 ED BNE SCHAR1
0105 0338 35 02 PULS A
0106 033A 35 B0 PULS X,Y,PC return with error if timed out
0107 *
0108 033C 35 02 SCHAR3 PULS A
0109 033E B7 E0 01 STA ACIAD1 send data (carry bit still set)
0110 0341 35 B0 PULS X,Y,PC
0111 *
0112 * Print Data
0113 *
0114 0343 8D D9 PDATA0 BSR SCHAR
0115 0345 A6 80 PDATA1 LDA ,X+
0116 0347 81 04 CMPA #$04
0117 0349 26 F8 BNE PDATA0
0118 034B 39 RTS
0119 *
0120 ** 'UF' Format RAMdisc to FLEX standard.
0121 *
0122 034C 0A 0D DISFOS FCB $0A,$0D
0123 034E 46 6F 72 6D 61 74 FCC 'Formating RAMdisk... '
69 6E 67 20 52 41
4D 64 69 73 6B 2E
2E 2E 20
0124 0363 0A 0D FCB $0A,$0D
0125 0365 44 72 69 76 65 20 FCC 'Drive Number ?'
4E 75 6D 62 65 72
20 3F
0126 0373 04 FCB 4
0127 0374 0A 0D 04 MESS6 FCB $0A,$0D,4
0128 0377 52 61 6D 64 69 73 FCC 'Ramdisk not allocated! '
6B 20 6E 6F 74 20
61 6C 6C 6F 63 61
74 65 64 21 20
0129 038E 04 FCB 4
0130 038F 0A 0D UFMSG1 FCB $0A,$0D
0131 0391 46 6F 72 6D 61 74 FCC 'Format Complete'
20 43 6F 6D 70 6C
65 74 65
0132 03A0 04 FCB 4
0133 *
0134 03A1 BD 04 B1 UFSUB JSR INITDR
0135 03A4 8E 03 4C LDX #DISFOS
0136 03A7 BD 03 45 JSR PDATA1
0137 03AA 17 FF 53 UFSUB1 LBSR RCHAR
0138 03AD 24 FB BCC UFSUB1
0139 03AF 17 FF 6C LBSR SCHAR
0140 03B2 81 30 CMPA #'0'
0141 03B4 10 25 00 F3 LBLO UFEXIT
0142 03B8 81 33 CMPA #'3'
0143 03BA 10 22 00 ED LBHI UFEXIT
0144 03BE 80 30 SUBA #'0'
0145 03C0 1F 89 TFR A,B
0146 03C2 F7 01 07 STB DRVNUM
0147 03C5 8E 01 04 LDX #DRVNUM-3
0148 03C8 BD 05 22 JSR DRVSEL
0149 *
0150 * set up free chain
0151 *
0152 03CB 8E 02 00 LDX #BUFFER clear out buffer
0153 03CE 4F CLRA
0154 03CF 5F CLRB
0155 03D0 A7 80 DFL1 STA 0,X+
0156 03D2 5A DECB
0157 03D3 26 FB BNE DFL1
0158 *
0159 03D5 7F 01 08 CLR TRACK
0160 03D8 86 01 LDA #1
0161 03DA B7 01 09 STA SECTOR
0162 03DD 8E 02 00 DFL2 LDX #BUFFER
0163 03E0 B6 01 08 LDA TRACK
0164 03E3 A7 84 STA 0,X
0165 03E5 B6 01 09 LDA SECTOR
0166 03E8 4C INCA
0167 03E9 81 00 CMPA #RMAXSEC+1 last sector on track?
0168 03EB 26 04 BNE DFL3
0169 03ED 6C 84 INC 0,X
0170 03EF 86 01 LDA #1
0171 03F1 A7 01 DFL3 STA 1,X
0172 03F3 B6 01 08 LDA TRACK
0173 03F6 F6 01 09 LDB SECTOR
0174 03F9 BD 04 FE JSR WRITSC
0175 03FC 7C 01 09 INC SECTOR
0176 03FF B6 01 09 LDA SECTOR
0177 0402 81 00 CMPA #RMAXSEC+1
0178 0404 26 D7 BNE DFL2
0179 0406 86 01 LDA #1
0180 0408 B7 01 09 STA SECTOR
0181 040B 7C 01 08 INC TRACK
0182 040E B6 01 08 LDA TRACK
0183 0411 81 40 CMPA #RMAXTRK
0184 0413 26 C8 BNE DFL2
0185 * break free chain at last track/sector
0186 0415 8E 02 00 LDX #BUFFER
0187 0418 86 3F LDA #RMAXTRK-1
0188 041A C6 FF LDB #RMAXSEC
0189 041C BD 04 DD JSR READSC
0190 041F 8E 02 00 LDX #BUFFER
0191 0422 6F 84 CLR 0,X
0192 0424 6F 01 CLR 1,X
0193 0426 86 3F LDA #RMAXTRK-1
0194 0428 C6 FF LDB #RMAXSEC
0195 042A BD 04 FE JSR WRITSC
0196 * set up sector structure, SIR, directory etc
0197 042D 8E 02 00 LDX #BUFFER
0198 0430 4F CLRA
0199 0431 C6 FF LDB #RMAXSEC
0200 0433 BD 04 DD JSR READSC
0201 0436 8E 02 00 LDX #BUFFER
0202 0439 6F 84 CLR 0,X break end of directory chain
0203 043B 6F 01 CLR 1,X
0204 043D 4F CLRA
0205 043E C6 FF LDB #RMAXSEC
0206 0440 BD 04 FE JSR WRITSC
0207 *
0208 0443 8E 02 00 LDX #BUFFER
0209 0446 4F CLRA
0210 0447 C6 03 LDB #3 set up SIR
0211 0449 BD 04 DD JSR READSC
0212 044C 8E 02 00 LDX #BUFFER
0213 044F 6F 84 CLR 0,X break forward link
0214 0451 6F 01 CLR 1,X
0215 0453 CC 52 41 LDD #$5241 set volume name (RAMDISK )
0216 0456 ED 88 10 STD 16,X
0217 0459 CC 4D 44 LDD #$4D44
0218 045C ED 88 12 STD 18,X
0219 045F CC 49 53 LDD #$4953
0220 0462 ED 88 14 STD 20,X
0221 0465 CC 4B 20 LDD #$4B20
0222 0468 ED 88 16 STD 22,X
0223 046B CC 00 01 LDD #1 volume number
0224 046E ED 88 1B STD 27,X
0225 0471 CC 01 01 LDD #$0101 first trk/sec 01-01
0226 0474 ED 88 1D STD 29,X
0227 0477 86 3F LDA #RMAXTRK-1
0228 0479 C6 FF LDB #RMAXSEC
0229 047B ED 88 1F STD 31,X
0230 047E ED 88 26 STD 38,X
0231 0481 CC 3E C1 LDD #RTOTSEC total DATA sectors (2912-14)
0232 0484 ED 88 21 STD 33,X
0233 *
0234 0487 86 01 LDA #01 month set default creation date (SYS09's birthday!)
0235 0489 A7 88 23 STA 35,X
0236 048C 86 07 LDA #07 day
0237 048E A7 88 24 STA 36,X
0238 0491 86 07 LDA #07 year
0239 0493 A7 88 25 STA 37,X
0240 *
0241 0496 4F RF3 CLRA
0242 0497 C6 03 LDB #3
0243 0499 BD 04 FE JSR WRITSC
0244 *
0245 * LDX #BUFFER
0246 * CLRA
0247 * LDB #1
0248 * JSR READSC
0249 * LDX #BUFFER
0250 * LDA #$AA set the init flag
0251 * STA 0,X
0252 * LDA #$55
0253 * STA 1,X
0254 * CLRA
0255 * LDB #1
0256 * JSR WRITSC
0257 *
0258 * Write Boot sector
0259 *
0260 049C 8E C0 00 LDX #$C000
0261 049F 4F CLRA TRACK 0
0262 04A0 C6 01 LDB #$01 SECTOR 1
0263 04A2 B7 01 08 STA TRACK
0264 04A5 F7 01 09 STB SECTOR
0265 04A8 17 00 53 LBSR WRITSC
0266 *
0267 04AB 8E 03 8F UFEXIT LDX #UFMSG1
0268 04AE 7E 03 45 JMP PDATA1
0269 *
0270 *
0271 ** FLEX 9 COMPACT FLASH DISK DRIVERS
0272 *
0273 * FOR SYS09BUG 1.2 ON THE BURCHED B5-X300
0274 * WITH I/O MAPPED AT $XE000
0275 * AND ROM MAPPED AT $XF000
0276 * THE BURCHED B5-X300 HAS 256KBYTES OF SRAM
0277 * THE FIRST 64K IS USED BY FLEX,
0278 * THE SECOND 192K MAY BE USED AS A RAM DISK
0279 *
0280 *
0281 0010 IMASK EQU $10 IRQ MASK CC
0282 0040 FMASK EQU $40 FIRQ MASK CC
0283 FFF0 DATREG EQU $FFF0 DAT REGISTERS
0284 *
0285 E040 CF_BASE EQU $E040
0286 E040 CF_DATA EQU CF_BASE+0
0287 E041 CF_ERROR EQU CF_BASE+1 ; read error
0288 E041 CF_FEATURE EQU CF_BASE+1 ; write feature
0289 E042 CF_SCNT EQU CF_BASE+2
0290 E043 CF_SNUM EQU CF_BASE+3
0291 E044 CF_CLO EQU CF_BASE+4
0292 E045 CF_CHI EQU CF_BASE+5
0293 E046 CF_HEAD EQU CF_BASE+6
0294 E047 CF_STATUS EQU CF_BASE+7 ; read status
0295 E047 CF_COMAND EQU CF_BASE+7 ; write command
0296 *
0297 * Command Equates
0298 *
0299 0020 CMDREAD EQU $20 ; Read Single sector
0300 0030 CMDWRITE EQU $30 ; Write Single sector
0301 00EF CMDFEATURE EQU $EF
0302 0001 FEAT8BIT EQU $01 ; enable 8 bit transfers
0303 00E0 HEADLBA EQU $E0
0304 *
0305 * Status bit equates
0306 *
0307 0080 BSY EQU $80
0308 0040 DRDY EQU $40
0309 0008 DRQ EQU $08
0310 0001 ERR EQU $01
0311 *
0312 *
0313 * INITIALIZE CF CARD FOR 8 BIT LBA MODE
0314 *
0315 04B1 8D 7F INITDR BSR WAITRDY
0316 04B3 86 E0 LDA #HEADLBA
0317 04B5 B7 E0 46 STA CF_HEAD
0318 04B8 86 01 LDA #FEAT8BIT
0319 04BA B7 E0 41 STA CF_FEATURE
0320 04BD 86 EF LDA #CMDFEATURE
0321 04BF B7 E0 47 STA CF_COMAND
0322 04C2 20 6E BRA WAITRDY
0323 *
0324 * RESTORE DISK DRIVER (SEEK TRACK 00)
0325 *
0326 04C4 8D 5C RESTR1 BSR DRVSEL
0327 04C6 4F CLRA ; Track 0
0328 04C7 C6 01 LDB #$01 ; Sector 1
0329 *
0330 * Seek track and sector
0331 * A holds track number (0 - ??)
0332 * B holds sector number (1 - ??)
0333 * Sector numbers starts from 1
0334 * subtract 1 to start from sector 0 on CF
0335 *
0336 04C9 5A SEEKTS DECB
0337 04CA F7 E0 43 STB CF_SNUM
0338 04CD B7 E0 44 STA CF_CLO
0339 04D0 F6 01 07 LDB DRVNUM
0340 04D3 F7 E0 45 STB CF_CHI
0341 04D6 C6 01 LDB #$01
0342 04D8 F7 E0 42 STB CF_SCNT
0343 04DB 5F CLRB
0344 04DC 39 RTS
0345 *
0346 * READ SECTORS FROM CF
0347 *
0348 *
0349 04DD 8D EA READSC BSR SEEKTS
0350 04DF 86 20 LDA #CMDREAD ; IDE READ MULTIPLE
0351 04E1 B7 E0 47 STA CF_COMAND
0352 04E4 8D 4C BSR WAITRDY
0353 *
0354 * READ LOOP
0355 *
0356 04E6 5F CLRB
0357 04E7 8D 58 RDLP1 BSR WAITDRQ
0358 04E9 B6 E0 40 LDA CF_DATA
0359 04EC A7 80 STA ,X+
0360 04EE 5A DECB
0361 04EF 26 F6 BNE RDLP1
0362 *
0363 04F1 5F CLRB
0364 04F2 8D 4D RDLP2 BSR WAITDRQ
0365 04F4 B6 E0 40 LDA CF_DATA
0366 04F7 5A DECB
0367 04F8 26 F8 BNE RDLP2
0368 *
0369 04FA 8D 36 BSR WAITRDY
0370 04FC 5F CLRB
0371 04FD 39 RTS
0372 *
0373 * WRITE SECTOR TO CF
0374 *
0375 04FE 8D C9 WRITSC BSR SEEKTS ; SEEK TRACK & SECTOR
0376 0500 86 30 LDA #CMDWRITE ; IDE WRITE MULTIPLE
0377 0502 B7 E0 47 STA CF_COMAND
0378 0505 8D 2B BSR WAITRDY
0379 *
0380 * WRITE LOOP
0381 *
0382 0507 5F CLRB
0383 0508 8D 37 WRTLP1 BSR WAITDRQ
0384 050A A6 80 LDA ,X+
0385 050C B7 E0 40 STA CF_DATA
0386 050F 5A DECB
0387 0510 26 F6 BNE WRTLP1
0388 *
0389 0512 5F CLRB
0390 0513 8D 2C WRTLP2 BSR WAITDRQ
0391 0515 4F CLRA
0392 0516 B7 E0 40 STA CF_DATA
0393 0519 5A DECB
0394 051A 26 F7 BNE WRTLP2
0395 *
0396 051C 8D 14 BSR WAITRDY
0397 051E 5F CLRB
0398 051F 39 RTS
0399 *
0400 * CHECK FOR BUSY
0401 * Doubles as VERIFY
0402 *
0403 0520 5F BUSY CLRB Never busy
0404 0521 39 RTS
0405 *
0406 * DRIVE SELECT DISK DRIVER
0407 *
0408 0522 A6 03 DRVSEL LDA 3,X GET DRIVE # FROM FCB
0409 0524 81 03 CMPA #3
0410 0526 23 01 BLS DRVS2 IF > 3, SET IT TO 0
0411 0528 4F CLRA
0412 0529 B7 01 07 DRVS2 STA DRVNUM
0413 052C 5F CLRB ; SET Z, CLEAR C
0414 052D 39 RTS
0415 *
0416 * CHECK DRIVE READY DISK DRIVER
0417 *
0418 052E A6 03 CHKDRV LDA 3,X
0419 0530 5F CLRB ; CLEAR C, SET Z
0420 0531 39 RTS
0421 *
0422 * WAIT UNTIL READY
0423 *
0424 0532 B6 E0 47 WAITRDY LDA CF_STATUS
0425 0535 85 80 BITA #BSY
0426 0537 26 F9 BNE WAITRDY
0427 0539 B6 E0 47 LDA CF_STATUS
0428 053C 85 40 BITA #DRDY
0429 053E 27 F2 BEQ WAITRDY
0430 0540 39 RTS
0431 *
0432 * WAIT FOR DATA REQUEST
0433 *
0434 0541 B6 E0 47 WAITDRQ LDA CF_STATUS
0435 0544 85 08 BITA #DRQ
0436 0546 27 F9 BEQ WAITDRQ
0437 0548 39 RTS
0438 *
0439 *******************************************************
0440 *
0441 * Bootstrap FLEX Loader
0442 *
0443 * SBUG1.8 loads the bootstap loader at $C000
0444 * however the Flex adaption manual has the
0445 * bootstrap loader residing at $C100
0446 *
0447 ******************************************************
0448 *
0449 * Equates
0450 *
0451 C0FF STACK EQU $C0FF
0452 C300 SCTBUF EQU $C300
0453 *
0454 * Start of Utility
0455 *
0456 C000 ORG $C000
0457 C000 20 0B BOOT BRA LOAD0
0458 C002 00 00 00 FCB 0,0,0
0459 C005 00 TRK FCB 0 File start track
0460 C006 00 SCT FCB 0 File start sector
0461 C007 00 DNS FCB 0 Density Flag (not used)
0462 C008 C0 00 TADR FDB $C000 Transfer address
0463 C00A 00 00 LADR FDB 0 Load Address
0464 C00C 00 DRNUM FCB 0 Drive number 0
0465 *
0466 C00D 10 CE C0 FF LOAD0 LDS #STACK Set up stack
0467 C011 FC C0 05 LDD TRK Set up start track and sector
0468 C014 FD C3 00 STD SCTBUF
0469 C017 10 8E C4 00 LDY #SCTBUF+256
0470 *
0471 * Perform actual file load
0472 *
0473 C01B 8D 35 LOAD1 BSR GETCH Get acharcater
0474 C01D 81 02 CMPA #$02 Data record hearder ?
0475 C01F 27 10 BEQ LOAD2 Skip, is so
0476 C021 81 16 CMPA #$16 Xfr address hearder ?
0477 C023 26 F6 BNE LOAD1 Loop if neither
0478 *
0479 * Get transfer address
0480 *
0481 C025 8D 2B BSR GETCH
0482 C027 B7 C0 08 STA TADR
0483 C02A 8D 26 BSR GETCH
0484 C02C B7 C0 09 STA TADR+1
0485 C02F 20 EA BRA LOAD1
0486 *
0487 * Load data record
0488 *
0489 C031 8D 1F LOAD2 BSR GETCH Get load address
0490 C033 B7 C0 0A STA LADR
0491 C036 8D 1A BSR GETCH
0492 C038 B7 C0 0B STA LADR+1
0493 C03B 8D 15 BSR GETCH Get Bytes count
0494 C03D 1F 89 TFR A,B
0495 C03F 5D TSTB
0496 C040 27 D9 BEQ LOAD1 Loop if count = 0
0497 C042 BE C0 0A LDX LADR Get load address
0498 C045 34 14 LOAD3 PSHS B,X
0499 C047 8D 09 BSR GETCH Get data character
0500 C049 35 14 PULS B,X
0501 C04B A7 80 STA ,X+ Store at load address
0502 C04D 5A DECB
0503 C04E 26 F5 BNE LOAD3 Loop until count = 0
0504 C050 20 C9 BRA LOAD1
0505 *
0506 * Get Character routine
0507 * Reads a sector if needed
0508 *
0509 C052 10 8C C4 00 GETCH CMPY #SCTBUF+256 out of data ?
0510 C056 26 0F BNE GETCH4 Go read Character if not
0511 C058 8E C3 00 GETCH2 LDX #SCTBUF Point to buffer
0512 C05B EC 84 LDD 0,X Get forward Link
0513 C05D 27 0B BEQ GO if zero, file is loaded
0514 C05F 8D 21 BSR READ Read next sector
0515 C061 26 9D BNE BOOT start over if error
0516 C063 10 8E C3 04 LDY #SCTBUF+4 Point past link
0517 C067 A6 A0 GETCH4 LDA ,Y+ Else, get a character
0518 C069 39 RTS
0519 *
0520 * File is loaded, Jump to it
0521 *
0522 C06A 6E 9F C0 08 GO JMP [TADR] Jump to transfer address
0523
0524 *
0525 ** FLEX 9 COMPACT FLASH DISK DRIVERS
0526 *
0527 * FOR SYS09BUG 1.2 ON THE BURCHED B5-X300
0528 * WITH I/O MAPPED AT $XE000
0529 * AND ROM MAPPED AT $XF000
0530 * THE BURCHED B5-X300 HAS 256KBYTES OF SRAM
0531 * THE FIRST 64K IS USED BY FLEX,
0532 * THE SECOND 192K MAY BE USED AS A RAM DISK
0533 *
0534 *
0535 *IMASK EQU $10 IRQ MASK CC
0536 *FMASK EQU $40 FIRQ MASK CC
0537 *DATREG EQU $FFF0 DAT REGISTERS
0538 *
0539 *CF_BASE EQU $E040
0540 *CF_DATA EQU CF_BASE+0
0541 *CF_ERROR EQU CF_BASE+1 ; read error
0542 *CF_FEATURE EQU CF_BASE+1 ; write feature
0543 *CF_SCNT EQU CF_BASE+2
0544 *CF_SNUM EQU CF_BASE+3
0545 *CF_CLO EQU CF_BASE+4
0546 *CF_CHI EQU CF_BASE+5
0547 *CF_HEAD EQU CF_BASE+6
0548 *CF_STATUS EQU CF_BASE+7 ; read status
0549 *CF_COMAND EQU CF_BASE+7 ; write command
0550 *
0551 * Command Equates
0552 *
0553 *CMDREAD EQU $20 ; Read Single sector
0554 *CMDWRITE EQU $30 ; Write Single sector
0555 *CMDFEATURE EQU $EF
0556 *FEAT8BIT EQU $01 ; enable 8 bit transfers
0557 *HEADLBA EQU $E0
0558 *
0559 * Status bit equates
0560 *
0561 *BSY EQU $80
0562 *DRDY EQU $40
0563 *DRQ EQU $08
0564 *ERR EQU $01
0565 *
0566 * Seek track and sector
0567 * A holds track number (0 - ??)
0568 * B holds sector number (1 - ??)
0569 * Sector numbers starts from 1
0570 * subtract 1 to start from sector 0 on CF
0571 *
0572 C06E 5A SEEK DECB
0573 C06F F7 E0 43 STB CF_SNUM
0574 C072 B7 E0 44 STA CF_CLO
0575 C075 F6 C0 0C LDB DRNUM
0576 C078 F7 E0 45 STB CF_CHI
0577 C07B C6 01 LDB #$01
0578 C07D F7 E0 42 STB CF_SCNT
0579 C080 5F CLRB
0580 C081 39 RTS
0581 *
0582 * READ SECTORS FROM CF
0583 *
0584 *
0585 C082 8D EA READ BSR SEEK
0586 C084 86 20 LDA #CMDREAD ; IDE READ MULTIPLE
0587 C086 B7 E0 47 STA CF_COMAND
0588 C089 8D 18 BSR WTRDY
0589 *
0590 * READ LOOP
0591 *
0592 C08B 5F CLRB
0593 C08C 8D 24 READ1 BSR WTDRQ
0594 C08E B6 E0 40 LDA CF_DATA
0595 C091 A7 80 STA ,X+
0596 C093 5A DECB
0597 C094 26 F6 BNE READ1
0598 *
0599 C096 5F CLRB
0600 C097 8D 19 READ2 BSR WTDRQ
0601 C099 B6 E0 40 LDA CF_DATA
0602 C09C 5A DECB
0603 C09D 26 F8 BNE READ2
0604 *
0605 C09F 8D 02 BSR WTRDY
0606 C0A1 5F CLRB
0607 C0A2 39 RTS
0608 *
0609 * WAIT UNTIL READY
0610 *
0611 C0A3 B6 E0 47 WTRDY LDA CF_STATUS
0612 C0A6 85 80 BITA #BSY
0613 C0A8 26 F9 BNE WTRDY
0614 C0AA B6 E0 47 LDA CF_STATUS
0615 C0AD 85 40 BITA #DRDY
0616 C0AF 27 F2 BEQ WTRDY
0617 C0B1 39 RTS
0618 *
0619 * WAIT FOR DATA REQUEST
0620 *
0621 C0B2 B6 E0 47 WTDRQ LDA CF_STATUS
0622 C0B5 85 08 BITA #DRQ
0623 C0B7 27 F9 BEQ WTDRQ
0624 C0B9 39 RTS
0625 *
0626 END START
Program + Init Data = 791 bytes
Error count = 0
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