254 lines
6.8 KiB
Org Mode
254 lines
6.8 KiB
Org Mode
* Debugging the Chivalry disk
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Ascending memory references from $1F76.
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** Disassembly of routine that is overwriting from $1F76
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$73,$74
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$77,$78
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$5B
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$5C
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$5D
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$62
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$1F51: A0 00 LDY #$00
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$1F53: B1 73 LDA ($73),Y
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$1F55: 85 5C STA $5C
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$1F57: C8 INY
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$1F58: B1 73 LDA ($73),Y
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$1F5A: 85 5B STA $5B
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$1F5C: C8 INY
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$1F5D: 18 CLC
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$1F5E: 98 TYA
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$1F5F: 65 73 ADC $73
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$1F61: 85 73 STA $73
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$1F63: A9 00 LDA #$00
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$1F65: 65 74 ADC $74
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$1F67: 85 74 STA $74
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$1F69: 20 9C 1D JSR $1D9C
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$1F6C: A2 00 LDX #$00
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$1F6E: A0 00 LDY #$00
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$1F70: A5 5C LDA $5C
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$1F72: 85 5D STA $5D
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$1F74: B1 73 LDA ($73),Y
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$1F76: 91 77 STA ($77),Y
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$1F78: C8 INY
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$1F79: C6 5D DEC $5D
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$1F7B: D0 F7 BNE $1F74
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$1F7D: 18 CLC
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$1F7E: 98 TYA
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$1F7F: 65 73 ADC $73
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$1F81: 85 73 STA $73
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$1F83: A9 00 LDA #$00
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$1F85: 65 74 ADC $74
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$1F87: 85 74 STA $74
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$1F89: E6 62 INC $62
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$1F8B: C6 5B DEC $5B
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$1F8D: D0 DA BNE $1F69
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$1F8F: 60 RTS
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** Routine it calls: $1D9C
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$5E
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$61
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$62
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$64
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$77
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$78
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$1D9C: A5 62 LDA $62
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$1D9E: AA TAX
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$1D9F: 0A ASL
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$1DA0: 0A ASL
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$1DA1: 29 1C AND #$1C
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$1DA3: 85 78 STA $78
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$1DA5: 8A TXA
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$1DA6: 6A ROR
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$1DA7: AA TAX
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$1DA8: 6A ROR
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$1DA9: 6A ROR
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$1DAA: 6A ROR
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$1DAB: 08 PHP
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$1DAC: 29 03 AND #$03
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$1DAE: 05 78 ORA $78
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$1DB0: 05 5E ORA $5E
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$1DB2: 85 78 STA $78
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$1DB4: 8A TXA
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$1DB5: 29 60 AND #$60
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$1DB7: 85 77 STA $77
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$1DB9: 6A ROR
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$1DBA: 28 PLP
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$1DBB: 6A ROR
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$1DBC: 29 98 AND #$98
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$1DBE: 05 77 ORA $77
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$1DC0: 85 77 STA $77
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$1DC2: A6 61 LDX $61
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$1DC4: BD D2 1D LDA $1DD2,X
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$1DC7: 18 CLC
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$1DC8: 65 77 ADC $77
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$1DCA: 85 77 STA $77
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$1DCC: BD 5E 1E LDA $1E5E,X
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$1DCF: 85 64 STA $64
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$1DD1: 60 RTS
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** Boot sector addresses
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$26 buffer pointer
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$2B boot slot
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$3D Last bsectr read
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$3E address btemp
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$5C offset to reader
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* apple][js shim
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disk_categories['Local Saves'].push({category: 'Game', filename: 'http://localhost:8000/chivalry.json', name: 'Chivalry'})
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* Nybble files
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** apple2js
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d5 aa 96 ff fe aa aa af af fa fb de aa eb
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d5 aa ad ff 96 96 a7 9d ae 96 d6 b4 ed 96 96 96 a7 9e b2 96 d6 b6 f2
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9b 96 96 a7 96 b2 97 d7 b6 ef 9a 96 96 9d 97 97 96 d6 b5 ee 97 96 96
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96 96 96 96 d6 b9 f9 9a 9b a7 ae ae 96 96 d6 96 fa 9e a6 a7 a7 a7 96
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96 b4 f3 9f 97 9b 9d 9d 9d 96 96 d6 ed ef d7 f2 ed b9 bd ae ea 96 96
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96 ac ad 96 96 ad ad 97 96 96 96 a7 ac ac ac ac 9b af 96 96 96 b2 ac
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ad ad ac ac 97 96 96 96 ac ac 96 96 ac ac da 9f 96 96 96 96 96 96 96
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96 9a a6 96 96 96 96 96 96 96 a6 96 a6 96 96 96 96 96 96 96 a6 96 a6
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96 96 96 96 96 96 96 a6 96 a6 96 96 96 96 96 96 96 a6 96 a6 96 96 96
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96 96 96 96 a6 96 a6 96 96 96 96 96 96 96 a6 97 97 96 96 96 96 96 96
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96 96 db 96 96 96 ac ad 96 96 ad ad 97 96 96 96 a7 ac ac ac ac 9b af
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96 96 96 b2 ac ad ad ac ac 97 96 96 96 ac ac 96 96 ac ac da 9f 96 96
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96 96 96 96 96 96 9a a6 96 96 96 96 96 96 96 a6 96 a6 96 96 96 96 96
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96 96 a6 96 a6 96 96 96 96 96 96 96 a6 96 a6 96 96 96 96 96 96 96 a6
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96 a6 96 96 96 96 96 96 96 a6 96 a6 96 96 96 96 96 96 96 a6 97 97 96
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96 96 96 96 96 96 96 9f 96 96 96 96 96 96 96 b2 f3 fb ef be ad af eb
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9a de aa eb
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** Mine
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d5 aa 96 ff fe aa aa af af fa fb de aa eb
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d5 aa ad ff 96 96 a7 9d ae 96 d6 b4 ed 96 96 96 a7 9e b2 96 d6 b6 f2
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9b 96 96 a7 96 b2 97 d7 b6 ef 9a 96 96 9d 97 97 96 d6 b5 ee 97 96 96
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96 96 96 96 d6 b9 f9 9a 9b a7 ae ae 96 96 d6 96 fa 9e a6 a7 a7 a7 96
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96 b4 f3 9f 97 9b 9d 9d 9d 96 96 d6 ed ef d7 f2 ed b9 df ae ce 96 96
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96 ac ad 96 96 ad ad 97 96 96 96 a7 ac ac ac ac 9b af 96 96 96 b2 ac
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ad ad ac ac 97 96 96 96 ac ac 96 96 ac ac da 9f 96 96 96 96 96 96 96
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96 9a a6 96 96 96 96 96 96 96 a6 96 a6 96 96 96 96 96 96 96 a6 96 a6
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96 96 96 96 96 96 96 a6 96 a6 96 96 96 96 96 96 96 a6 96 a6 96 96 96
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96 96 96 96 a6 96 a6 96 96 96 96 96 96 96 a6 97 97 96 96 96 96 96 96
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96 96 db 96 96 96 ac ad 96 96 ad ad 97 96 96 96 a7 ac ac ac ac 9b af
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96 96 96 b2 ac ad ad ac ac 97 96 96 96 ac ac 96 96 ac ac da 9f 96 96
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96 96 96 96 96 96 9a a6 96 96 96 96 96 96 96 a6 96 a6 96 96 96 96 96
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96 96 a6 96 a6 96 96 96 96 96 96 96 a6 96 a6 96 96 96 96 96 96 96 a6
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96 a6 96 96 96 96 96 96 96 a6 96 a6 96 96 96 96 96 96 96 a6 97 97 96
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96 96 96 96 96 96 96 9f 96 96 96 96 96 96 96 b2 f3 fb ef be ad af eb
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9a de aa eb
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* Divergence?
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$B700: (797128) No
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$8004: (14016092) Yes
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* Slot 6 accesses from:
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1 Slot6 access from $C632
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1 Slot6 access from $C635
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1 Slot6 access from $C638
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1 Slot6 access from $C63B
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1 Slot6 access from $C640
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1 Slot6 access from $C64A
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$C661: 14, 367, 767, etc.
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$C6AD: 86
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$C6BF: 256
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$B952: 10, 367, etc.
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$B907: 86
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$B918: 256
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0xB942: error return
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0xB942: good return
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* Possibly innocuous differences:
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38,39c38,40
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< $0026: FD FD
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---
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> $0026: F7 F2
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< $002C: FD 02
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---
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> $002C: F2 0D
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< $01FC: 30
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---
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> $01FC: 34
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26,27
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2C:
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2D:
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2D: 0D - sector number from header
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2E: 01 - track number from sector header
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2F: FE - volume number from sector header
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2C: F2 - sector header checksum
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CURRENT.TRACK .EQ $478
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DRIVE.1.TRACK .EQ $478 THRU 47F (INDEX BY SLOT)
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DRIVE.2.TRACK .EQ $4F8 THRU 4FF (INDEX BY SLOT)
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SEARCH.COUNT .EQ $4F8
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RETRY.COUNT .EQ $578
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SLOT .EQ $5F8
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SEEK.COUNT .EQ $6F8
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SECTOR .EQ $2D
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TRACK .EQ $2A
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VOLUME .EQ $2F
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DRIVE.NO .EQ $35
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DCT.PNTR .EQ $3C,3D
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BUF.PNTR .EQ $3E,3F
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MOTOR.TIME .EQ $46,47
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IOB.PNTR .EQ $48,49
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* Append A,X,Y,SP,P,PC
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NOP: EA
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LDA #$00: A9 00
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LDX #$00: A2 00
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LDY #$00: A0 00
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CMP #$AA: C9 AA
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PHP #$08
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PLA #$68
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* Notes - status
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0xB99E - is not a good address, because it's used to return from READ.ADDRESS as well as READ.SECTOR.
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** After 69th sector access
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100: a2js: 0xB8C7, goa2: 0xB8C7 - match
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125000: a2js: 0x1DC0, goa2: 0x1DC0 - match
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187500: a2js: 0x1DA5, goa2: 0x1DA5 - match
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195312: a2js: 0x1F69, goa2: 0x1F69 - match
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197265: a2js: 0x1DB7, goa2: 0x1DB7 - match
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197509: a2js: 0x02F8, goa2: 0x02F8 - match
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197631: a2js: 0x030C, goa2: 0x030C - match
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197646: a2js: 0xBD13, goa2: 0xBD13 - match
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197653: a2js: 0xBD3F, goa2: 0xBD3F - match
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197657: a2js: 0xBD43, goa2: 0xBD43 - match
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197659: a2js: 0xBD49, goa2: 0xBD49 - DIFF in P
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197661: a2js: 0xBD4F, goa2: 0xBD4C - LOTS!
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197692: a2js: 0xBD70, goa2: 0xBD3C - LOTS!
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197753: a2js: 0xBA03, goa2: 0xBD5A - DIFF!
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198241: a2js: 0xBA03, goa2: 0xBA03 - DIFF in A,X
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199218: a2js: 0xBA02, goa2: 0xBA02 - DIFF in X
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203125: a2js: 0xBA03, goa2: 0xBA03 - DIFF in A,X
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218750: a2js: 0xBA05, goa2: 0xBA02 - DIFF!
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250000: a2js: 0xBA03, goa2: 0xBA0C - DIFF!
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500000: a2js: 0xBDA0, goa2: 0xBDA1 - DIFF!
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(/ (+ 197657 197661) 2)
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197659
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