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Added Nick's disasm of GEOS NSC driver
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tomch
parent
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257
AppleWin/docs/GeosNoSlotClockDriverDisassembly.txt
Normal file
257
AppleWin/docs/GeosNoSlotClockDriverDisassembly.txt
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Dallas SmartWatch DS1216 (No-Slot-Clock) GEOS driver.
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Partial disassembly and comments by Nick Westgate (and CiderPress).
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Note: This code requires the clock to be in the internal C8 ROM space.
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0800- 4C 15 08 JMP $0815 ;read time
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0803- 4C B8 08 JMP $08B8
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0806- 4C BC 08 JMP $08BC ;write time
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0809- 4C E4 08 JMP $08E4
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080C- 4C F1 08 JMP $08F1
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080F- 4C 12 08 JMP $0812
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0812- A2 30 LDX #$30
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0814- 60 RTS
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0815- A9 00 LDA #$00
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0817- 10 37 BPL $0850
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0819- A9 3B LDA #$3B
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081B- 8D 16 08 STA $0816
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081E- 20 6E 08 JSR $086E ;init clock
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0821- 20 93 08 JSR $0893 ;get clock data byte (0, discard centiseconds)
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0824- A2 03 LDX #$03 ;(4 bytes)
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0826- 20 93 08 JSR $0893 ;get clock data byte (1-4 -> F202-F205: day h m s)
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0829- 9D 02 F2 STA $F202,X
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082C- CA DEX
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082D- 10 F7 BPL $0826
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082F- A2 02 LDX #$02 ;(3 bytes, this overwrites day at F202)
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0831- 20 93 08 JSR $0893 ;get clock data byte (5-7 -> F200-F202: Y M D)
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0834- 9D 00 F2 STA $F200,X
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0837- CA DEX
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0838- 10 F7 BPL $0831
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083A- 2C 06 F2 BIT $F206
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083D- 10 11 BPL $0850
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083F- AD 03 F2 LDA $F203
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0842- C9 FF CMP #$FF
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0844- D0 0A BNE $0850
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0846- AD 04 F2 LDA $F204
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0849- C9 FF CMP #$FF
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084B- D0 03 BNE $0850
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084D- 4E 06 F2 LSR $F206
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0850- 4C DB 08 JMP $08DB ;exit safely
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0853- A9 00 LDA #$00 ;*** write 0 byte to clock
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0855- 84 09 STY $09 ;*** write byte to clock
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0857- 38 SEC
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0858- A0 FF LDY #$FF
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085A- C8 INY
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085B- E9 0A SBC #$0A
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085D- 10 FB BPL $085A
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085F- 69 0A ADC #$0A
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0861- 85 07 STA $07
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0863- 98 TYA
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0864- 0A ASL
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0865- 0A ASL
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0866- 0A ASL
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0867- 0A ASL
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0868- 05 07 ORA $07
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086A- A0 00 LDY #$00
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086C- F0 11 BEQ $087F
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086E- 78 SEI ;*** init clock
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086F- AD 15 C0 LDA $C015 r:RDCXROM
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0872- 85 0F STA $0F
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0874- 8D 07 C0 STA $C007 w:SETINTCXROM
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0877- AD 04 C8 LDA $C804
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087A- A0 07 LDY #$07
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087C- B9 F7 08 LDA $08F7,Y
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087F- 38 SEC
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0880- 6A ROR
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0881- A2 00 LDX #$00
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0883- 90 02 BCC $0887
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0885- A2 01 LDX #$01
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0887- DD 00 C8 CMP $C800,X
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088A- 4A LSR
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088B- D0 F4 BNE $0881
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088D- 88 DEY
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088E- 10 EC BPL $087C
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0890- A4 09 LDY $09
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0892- 60 RTS
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0893- A0 07 LDY #$07 ;*** get clock data byte (convert BCD to hex)
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0895- AD 04 C8 LDA $C804
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0898- 6A ROR
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0899- 66 07 ROR $07
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089B- 88 DEY
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089C- 10 F7 BPL $0895
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089E- A5 07 LDA $07
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08A0- A8 TAY
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08A1- 29 0F AND #$0F
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08A3- 85 07 STA $07
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08A5- 98 TYA
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08A6- 4A LSR
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08A7- 4A LSR
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08A8- 4A LSR
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08A9- 4A LSR
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08AA- 18 CLC
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08AB- A8 TAY
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08AC- F0 07 BEQ $08B5
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08AE- A9 00 LDA #$00
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08B0- 69 0A ADC #$0A
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08B2- 88 DEY
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08B3- D0 FB BNE $08B0
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08B5- 65 07 ADC $07
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08B7- 60 RTS
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08B8- CE 16 08 DEC $0816
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08BB- 60 RTS
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08BC- 20 6E 08 JSR $086E ;init clock
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08BF- 20 53 08 JSR $0853 ;write 0 byte to clock
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08C2- A0 02 LDY #$02
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08C4- B9 03 00 LDA $0003,Y
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08C7- 20 55 08 JSR $0855 ;write byte to clock
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08CA- 88 DEY
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08CB- 10 F7 BPL $08C4
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08CD- 20 53 08 JSR $0853 ;write 0 byte to clock
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08D0- A0 02 LDY #$02
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08D2- B9 00 00 LDA $0000,Y
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08D5- 20 55 08 JSR $0855 ;write byte to clock
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08D8- 88 DEY
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08D9- 10 F7 BPL $08D2
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08DB- 26 0F ROL $0F ;prepare for exit
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08DD- B0 03 BCS $08E2
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08DF- 8D 06 C0 STA $C006 w:SETSLOTCXROM
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08E2- 58 CLI
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08E3- 60 RTS
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08E4- A5 00 LDA $00
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08E6- 8D 43 08 STA $0843
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08E9- A5 01 LDA $01
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08EB- 8D 4A 08 STA $084A
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08EE- A2 80 LDX #$80
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08F0- 2C A2 00 BIT $00A2
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08F3- 8E 06 F2 STX $F206
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08F6- 60 RTS
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08F7- 5C A3 3A C5 5C A3 3A C5 ;*** clock pattern
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08FF- 59
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0900- FA PLX
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0901- 88 DEY
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0902- 10 F8 BPL $08FC
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0904- 20 B7 5C JSR $5CB7
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0907- 68 PLA
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0908- C9 0F CMP #$0F
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090A- D0 03 BNE $090F
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090C- 4C 4C 71 JMP $714C
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090F- C9 80 CMP #$80
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0911- 90 20 BCC $0933
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0913- C9 8E CMP #$8E
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0915- B0 1C BCS $0933
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0917- 20 D7 65 JSR $65D7
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091A- C9 81 CMP #$81
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091C- D0 03 BNE $0921
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091E- 4C D9 93 JMP $93D9
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0921- C9 82 CMP #$82
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0923- F0 04 BEQ $0929
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0925- C9 8A CMP #$8A
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0927- D0 03 BNE $092C
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0929- 4C 6E 71 JMP $716E
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092C- C9 83 CMP #$83
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092E- D0 0A BNE $093A
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0930- 4C 7B 71 JMP $717B
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0933- C9 FF CMP #$FF
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0935- D0 03 BNE $093A
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0937- 4C EA AB JMP $ABEA
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093A- 20 40 71 JSR $7140
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093D- A2 00 LDX #$00
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093F- 60 RTS
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0940- A9 00 LDA #$00
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0942- 8D F8 70 STA $70F8
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0945- A2 72 LDX #$72
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0947- A9 DB LDA #$DB
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0949- 4C 08 4D JMP $4D08
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094C- 20 13 74 JSR $7413
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094F- A9 00 LDA #$00
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0951- 85 AA STA $AA
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0953- 20 91 5D JSR $5D91
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0956- 20 81 03 JSR $0381
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0959- 8A TXA
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095A- F0 03 BEQ $095F
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095C- 4C 64 5E JMP $5E64
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095F- A9 00 LDA #$00
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0961- 85 70 STA $70
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0963- 68 PLA
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0964- 68 PLA
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0965- 20 32 5F JSR $5F32
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0968- 8A TXA
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0969- D0 F1 BNE $095C
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096B- 4C 45 5F JMP $5F45
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096E- A9 FF LDA #$FF
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0970- 48 PHA
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0971- A9 58 LDA #$58
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0973- 48 PHA
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0974- A9 00 LDA #$00
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0976- 85 00 STA $00
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0978- 4C 8D 03 JMP $038D
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097B- A9 80 LDA #$80
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097D- 8D B1 61 STA $61B1
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0980- 20 D7 4D JSR $4DD7
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0983- A5 12 LDA $12
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0985- 18 CLC
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0986- 69 01 ADC #$01
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0988- 85 08 STA $08
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098A- A5 13 LDA $13
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098C- 69 00 ADC #$00
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098E- 85 09 STA $09
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0990- A9 12 LDA #$12
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0992- 85 07 STA $07
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0994- A9 85 LDA #$85
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0996- 85 06 STA $06
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0998- A2 08 LDX #$08
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099A- A0 06 LDY #$06
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099C- 20 61 4D JSR $4D61
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099F- A9 12 LDA #$12
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09A1- 85 05 STA $05
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09A3- A9 71 LDA #$71
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09A5- 85 04 STA $04
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09A7- A2 08 LDX #$08
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09A9- 20 98 64 JSR $6498
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09AC- A2 08 LDX #$08
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09AE- A0 04 LDY #$04
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09B0- A9 0F LDA #$0F
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09B2- 20 EA FE JSR $FEEA
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09B5- A9 00 LDA #$00
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09B7- 8D 80 12 STA $1280
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09BA- A0 1F LDY #$1F
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09BC- B1 12 LDA ($12),Y
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09BE- 85 02 STA $02
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09C0- C8 INY
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09C1- B1 12 LDA ($12),Y
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09C3- 85 03 STA $03
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09C5- 20 24 66 JSR $6624
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09C8- F0 0B BEQ $09D5
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09CA- 20 3C 4E JSR $4E3C
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09CD- A5 80 LDA $80
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09CF- 8D 0D F6 STA $F60D
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09D2- 4C C2 5E JMP $5EC2
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09D5- AD CE F6 LDA $F6CE
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09D8- D0 03 BNE $09DD
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09DA- 4C 40 71 JMP $7140
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09DD- A9 F6 LDA #$F6
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09DF- 85 03 STA $03
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09E1- A9 CE LDA #$CE
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09E3- 85 02 STA $02
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09E5- A9 12 LDA #$12
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09E7- 85 15 STA $15
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09E9- A9 99 LDA #$99
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09EB- 85 14 STA $14
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09ED- A2 02 LDX #$02
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09EF- A0 14 LDY #$14
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09F1- A9 0C LDA #$0C
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09F3- 20 63 4D JSR $4D63
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09F6- 20 3F 72 JSR $723F
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09F9- 8A TXA
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09FA- D0 CE BNE $09CA
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09FC- AD 21 12 LDA $1221
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09FF- D0 00 BNE $0A01
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0A01- 00 BRK
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