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WIP RWTS
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Michaelangel007
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README.md
97
README.md
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@ -629,71 +629,72 @@ I'll use the prefix:
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* uppercase `RWTS` for functions
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```asm
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rwts_ReadChecksum = $E1
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rwts_Sector_Have = $E3
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rwts_E4 = $E4 ; ???
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rwts_LoadAddr = $E6 ; Pointer to dest buf
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rwts_LoadAddr = $E6 ; 16-bit Pointer to dest buf
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rwts_ReadCount = $E8 ; Attempts Remaining to read sector
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rwts_HalfTrack_Want = $EB
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rwts_HalfTrack_Prev = $EC ; (mirror of $FF)
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rwts_ED = $ED ; ??? previous track?
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rwts_Track = $ED
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rwts_Return = $EB
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rwts_Return = $EB ; 16-bit Pointer to caller
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rwts_temp = $EC
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rwts_SlotX16 = $FD
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rwts_HalfTrack_Have = $FF ; Current track
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rwts_DestAddrLow = $B3E9 ; ???
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rwts_DestAddr = $B3E9 ; ProDOS block load dest
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ORG $B000
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RWTS_ReadTrack
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B000:4C 51 B4 JMP Do_ReadTrack ; Y = Track, A = Addr
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RWTS_LoadCode
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B003:4C ED B3 JMP Do_LoadCode ; Y = Track, $11 bytes after Program Counter
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RWTS_?
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B006:4C 22 B4 JMP Do_B422 ; TODO: FIXME
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RWTS_Seek
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B009:4C E9 B0 JMP Do_Seek ; A = Track
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RWTS_?
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B00C:4C 62 B4 JMP Do_B462 ; TODO: FIXME
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B000:4C 51 B4 RWTS_ReadTrack: JMP Do_ReadTrack ; [0] Y = Track, A = Addr
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B003:4C ED B3 RWTS_LoadCode: JMP Do_LoadCode ; [1] Y = Track, $11 bytes after Program Counter
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B006:4C 22 B4 RWTS_LoadBlocks: JMP Do_LoadBlocks ; [2] Addr = $A,Y, X = ??? TODO
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B009:4C E9 B0 RWTS_Seek: JMP Do_Seek ; [3] A = Track
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B00C:4C 62 B4 RWTS_ReadTrackQuiet: JMP Do_B462 ; [4] Y = Track, A = Addr, no zap if bad read
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B00F:38 SEC ; Error
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B00F:38 SEC ; Error TODO: Who calls us???
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B010:60 RTS
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; ====================
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; X = Slot * $10
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; ====================
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RWTS_ReadSector
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B011:86 FD STX $FD ; $E6 = Pointer to Dest Address
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B011:86 FD STX rwts_SlotX16 ; $E6 = Pointer to Dest Address
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B013:8A TXA
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B014:09 8C ORA #<DRIVE_DATA ; DRIVE_DATA = $C08C
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B016:8D 70 B0 STA _B070
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B019:8D 87 B0 STA _B087
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B01C:8D 9D B0 STA _B09D
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B01F:8D B1 B0 STA _B0B1
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B022:8D C6 B0 STA _B0C6
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B014:09 8C ORA #<DRIVE_DATA ; DRIVE_DATA = $C08C
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B016:8D 70 B0 STA FixupA+1
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B019:8D 87 B0 STA FixupB+1
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B01C:8D 9D B0 STA _B09C+1
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B01F:8D B1 B0 STA _B0B0+1
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B022:8D C6 B0 STA _B0C5+1
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B025:A5 E6 LDA rwts_LoadAddr
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B027:A4 E7 LDY rwts_LoadAddr+1
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B029:8D C3 B0 STA _B0C2+1
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B02C:8C C4 B0 STY _B0C2+2
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B02F:38 SEC
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B030:E9 54 SBC #$54
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B032:B0 02 BCS ;v $B036 TODO
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B032:B0 02 BCS ;v $B036 TODO
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B034:88 DEY
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B035:38 SEC
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B036:8D AB B0 STA ; $B0AA+1
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B039:8C AC B0 STA ; $B0AA+2
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B03C:E9 57 SBC #$57
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B03E:B0 01 BCS ;v $B041
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B041:8D 84 B0 STA ; $B083+1
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B044:8C B5 B0 STA ; $B083+2
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B036:8D AB B0 STA ; $B0AA+1
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B039:8C AC B0 STA ; $B0AA+2
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B03C:E9 57 SBC #$57
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B03E:B0 01 BCS ;v $B041
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B041:8D 84 B0 STA ; $B083+1
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B044:8C B5 B0 STA ; $B083+2
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B047:A0 20 LDY #$20
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B049:88 DEY
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DataProlog1:
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B04C:BD 8C C0 LDA DRIVE_DATA,X
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B04F:10 FB BPL DataProlog1
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TestProlog1:
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B051:49 D5 EOR #$D5
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B053:D0 F4 BNE _B049
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B055:EA NOP
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@ -701,11 +702,39 @@ I'll use the prefix:
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B056:BD 8C C0 LDA DRIVE_DATA,X
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B059:10 FB BPL DataProlog2 ;^ $B056
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B05B:C9 AA CMP #$AA
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B05D:D0 F2 BNE ;^ $B051
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B05D:D0 F2 BNE TestProlog1 ;^ $B051
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B05F:EA NOP
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DataProlog3:
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B065: CMP #$AD
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B069: Decode #$56 nibbles into $2AA..$2FF
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B060:BD 8C C0 LDA DRIVE_DATA,X
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B063:10 FB BPL DataProlog3
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TestProlog3:
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B065:C9 AD CMP #$AD
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B067:D0 E8 BNE ;^ $B051
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B069:A0 AA LDY #$AA ;Decode #$56 nibbles into $2AA..$2FF
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B06B:A9 00 LDA #$00
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NextChecksum:
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B06D:85 E1 STA rwts_ReadChecksum
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FixupA:
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B06F:AE 8C C0 LDX DRIVE_DATA ; *** SELF-MODIFIED CODE @ $B016
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B072:10 FB BPL FixupA ; A = $96 .. $FF
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B074:BD 00 B1 LDA DiskNibble64-$96,X ; [nib]
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B077:99 00 02 STA Decode200,Y
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B07A:45 E1 EOR rwts_ReadChecksum
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B07C:C8 INY
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B07D:D0 EE BNE NextChecksum ;^ $B06D
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B07F:A0 AA LDY #$AA
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B081:D0 03 BNE FixupB ;v $B086, always
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B083:99 FF FF STA $FFFF,Y ; *** SELF-MODIFYING code!
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FixupB:
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B086:AE 8C C0 LDX $C08C ; *** SELF-MODIFIED CODE @ $B019
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B089:10 FB BPL FixupB
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B08B:
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... TODO ...
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DataEpilog1:
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B0DC:C9 DE CMP #$DE
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B0DE:B0 02 BCS DataEpilogGood ;v $B0E2
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@ -823,6 +852,8 @@ I'll use the prefix:
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B18C:00 00 00 00
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B190:00 00 00 00
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B194:00 00
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DiskNibble64:
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;Valid Disk Nibbles (6-bit * 4) Lookup Table
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;[+0 +1 +2 +3 +4 +5 +6 +7]
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;[+8 +9 +A +B +C +D +E +F]
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