mirror of https://github.com/JorjBauer/aiie.git
268 lines
8.1 KiB
C++
268 lines
8.1 KiB
C++
#include "mouse.h"
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#include <string.h>
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#include "mouse-rom.h"
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Mouse::Mouse()
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{
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}
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Mouse::~Mouse()
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{
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}
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bool Mouse::Serialize(int8_t fd)
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{
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return true;
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}
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bool Mouse::Deserialize(int8_t fd)
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{
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return true;
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}
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void Mouse::Reset()
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{
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}
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uint8_t Mouse::readSwitches(uint8_t s)
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{
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return 0xFF;
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}
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void Mouse::writeSwitches(uint8_t s, uint8_t v)
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{
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printf("unknown switch 0x%X\n", s);
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}
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void Mouse::loadROM(uint8_t *toWhere)
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{
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/* ROM Disassembly:
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C400- 2C 58 FF BIT $FF58 ; test bits in FF58 w/ A
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C403- 70 1B BVS $C420 ; V will contain bit 6 from $FF58, which should be $20 on boot-up
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C405- 38 SEC
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C406- 90 18 BCC $C420 ; no-op; unless called @ $C406 directly?
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C408- B8 CLV ; clear overflow
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C409- 50 15 BVC $C420 ; always branches
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; unused... ? more lookup table... ?
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C40B- 01 20 ORA ($20,X)
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C40D- AE AE AE LDX $AEAE
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; This is the lookup table for entry addresses
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C410- AE
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C411- 00
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C412- 6D ;(setmouse @ c46d)
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C413- 75 ;(servemouse @ C475)
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C414- 8E ;(readmouse @ C48E)
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C415- 9F ;(clearmouse @ C49F)
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C416- A4 ;(posmouse @ C4A4)
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C417- 86 ;(clampmouse @ C486)
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C418- A9 ;(homemouse @ C4A9)
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C419- 97 ;(initmouse @ C497)
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C41A- AE
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C41B- AE
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C41C- AE ;(semi-documented: sets mouse frequency handler to 60 or 50 hz)
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C41D- AE
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C41E- AE
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C41F- AE
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; Main
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C420- 48 PHA ; push accumulator to stack
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C421- 98 TYA
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C422- 48 PHA ; push Y to stack
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C423- 8A TXA
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C424- 48 PHA ; push X to stack
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C424- 48 PHA
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C425- 08 PHP ; push status to stack
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C426- 78 SEI ; disable interrupts
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; This JSR $FF58 is a trick to get the address we're calling from. By
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; default, $FF58 contains a RTS (until patched as the DOS '&' vector,
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; or ProDOS does something similar). As long as this executes before
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; the DOS takes over, it's safe; but if we're doing this after ProDOS
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; loads, a 64k machine might have garbage after the language card RAM
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; is loaded here. A safer alternative would be something like
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; LDA #$60 ; Write an RTS ($60) to a temporary memory
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; STA WORK ; address, and then
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; JSR WORK ; jump to it
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; TSX
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; LDA $100, X ; grab the return address off the stack
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C427- 20 58 FF JSR $FF58
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C42A- BA TSX
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C42B- BD 00 01 LDA $0100,X
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C42E- AA TAX
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C42F- 0A ASL
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C430- 0A ASL
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C431- 0A ASL
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C432- 0A ASL
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C433- A8 TAY
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C434- 28 PLP ; restore status from stack
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C435- 50 0F BVC $C446 ; overflow is clear if ... ?
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C437- A5 38 LDA $38 ; >> what's in $38?
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C439- D0 0D BNE $C448 ; restore stack & return
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C43B- 8A TXA
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C43C- 45 39 EOR $39 ; >> what's in $39?
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C43E- D0 08 BNE $C448 ; restore stack & return
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C440- A9 05 LDA #$05
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C442- 85 38 STA $38 ; ($38) = $05
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C442- 85 38 STA $38
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C444- D0 0B BNE $C451
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C446- B0 09 BCS $C451 ; carry set if ... ?
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C448- 68 PLA ; pull X from stack
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C449- AA TAX
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C44A- 68 PLA ; pull Y from stack, but
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C44B- EA NOP ; throw it away
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C44C- 68 PLA ; pull A from stack
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C44D- 99 80 C0 STA $C080,Y ; LC RAM bank2, read and wr-protect
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C450- 60 RTS
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C451- 99 81 C0 STA $C081,Y ; LC RAM bank 2, read ROM
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C454- 68 PLA ;
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C455- BD 38 06 LDA $0638,X
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C458- AA TAX
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C459- 68 PLA
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C45A- A8 TAY
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C45B- 68 PLA
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C45C- BD 00 02 LDA $0200,X ; keyboard character buffer?
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C45F- 60 RTS
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C460- 00 BRK
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C461- 00 BRK
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C462- 00 BRK
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C463- 00 BRK
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C464- 00 BRK
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C465- 00 BRK
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C466- 00 BRK
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C467- 00 BRK
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C468- 00 BRK
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C469- 00 BRK
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C46A- 00 BRK
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C46B- 00 BRK
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C46C- 00 BRK
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; SetMouse
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C46D- C9 10 CMP #$10 ; interrupt on VBL + interrupt on mouse move?
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C46F- B0 3F BCS $C4B0 ; RTS if A >= 0x10
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C471- 99 82 C0 STA $C082,Y ; LC RAM bank 2, read ROM, wr-protect RAM
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C474- 60 RTS
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; ServeMouse
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C475- 48 PHA
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C476- 18 CLC
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C477- 90 39 BCC $C4B2 ; always branches
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; ServeMouse cleanup and exit
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C479- 99 83 C0 STA $C083,Y ; LC RAM bank 2, read RAM
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C47C- BD B8 06 LDA $06B8,X
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C47F- 29 0E AND #$0E
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C481- D0 01 BNE $C484
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C483- 38 SEC
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C484- 68 PLA
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C485- 60 RTS
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; ClampMouse
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C486- C9 02 CMP #$02
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C488- B0 26 BCS $C4B0 ; RTS if 2 <= the A register
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C48A- 99 83 C0 STA $C083,Y ; LC RAM bank 2, read RAM
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C48D- 60 RTS
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; ReadMouse
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C48E- A9 04 LDA #$04
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C490- 99 83 C0 STA $C083,Y ; LC RAM bank 2, read RAM
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C493- 18 CLC
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C494- EA NOP
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C495- EA NOP
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C496- 60 RTS
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; InitMouse
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C497- EA NOP
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C498- A9 02 LDA #$02
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C49A- 99 83 C0 STA $C083,Y ; LC RAM bank 2, read RAM
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C49D- 18 CLC
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C49E- 60 RTS
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; ClearMouse
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C49F- EA NOP
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C4A0- A9 05 LDA #$05
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C4A2- D0 F6 BNE $C49A
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; PosMouse
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C4A4- EA NOP
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C4A5- A9 06 LDA #$06
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C4A7- D0 F1 BNE $C49A
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; HomeMouse
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C4A9- EA NOP
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C4AA- A9 07 LDA #$07
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C4AC- D0 EC BNE $C49A
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C4AE- A2 03 LDX #$03
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C4B0- 38 SEC
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C4B1- 60 RTS
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; ServeMouse main worker
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C4B2- 08 PHP
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C4B3- A5 00 LDA $00
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C4B5- 48 PHA
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C4B6- A9 60 LDA #$60
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C4B8- 85 00 STA $00
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C4BA- 78 SEI
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C4BB- 20 00 00 JSR $0000
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C4BE- BA TSX
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C4BF- 68 PLA
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C4C0- 85 00 STA $00
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C4C2- BD 00 01 LDA $0100,X
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C4C5- 28 PLP
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C4C6- AA TAX
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C4C7- 0A ASL
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C4C8- 0A ASL
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C4C9- 0A ASL
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C4CA- 0A ASL
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C4CB- A8 TAY
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C4CC- A9 03 LDA #$03
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C4CE- 18 CLC
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C4CF- 90 A8 BCC $C479 ; always branches
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*/
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uint8_t rom[256] = { 0x2c, 0x58, 0xff, 0x70, 0x1B, 0x38, 0x90, 0x18,
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0xb8, 0x50, 0x15, 0x01, 0x20, 0xae, 0xae, 0xae,
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0xae, 0x00, 0x6d, 0x75, 0x8e, 0x9f, 0xa4, 0x86,
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0xa9, 0x97, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae,
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0x48, 0x98, 0x48, 0x8a, 0x48, 0x08, 0x78, 0x20,
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0x58, 0xFF, 0xBA, 0xBD, 0x00, 0x01, 0xAA, 0x0A,
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0x0A, 0x0A, 0x0A, 0xA8, 0x28, 0x50, 0x0F, 0xA5,
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0x38, 0xd0, 0x0d, 0x8a, 0x45, 0x39, 0xd0, 0x08,
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0xa9, 0x05, 0x85, 0x38, 0xd0, 0x0b, 0xb0, 0x09,
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0x68, 0xaa, 0x68, 0xea, 0x68, 0x99, 0x80, 0xc0,
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0x60, 0x99, 0x81, 0xc0, 0x68, 0xbd, 0x38, 0x06,
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0xaa, 0x68, 0xa8, 0x68, 0xbd, 0x00, 0x02, 0x60,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0xc9, 0x10, 0xb0,
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0x3f, 0x99, 0x82, 0xc0, 0x60, 0x48, 0x18, 0x90,
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0x39, 0x99, 0x83, 0xc0, 0xbd, 0xb8, 0x06, 0x29,
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0x0E, 0xD0, 0x01, 0x38, 0x68, 0x60, 0xc9, 0x02,
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0xb0, 0x26, 0x99, 0x83, 0xc0, 0x60, 0xa9, 0x04,
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0x99, 0x83, 0xc0, 0x18, 0xea, 0xea, 0x60, 0xea,
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0xa9, 0x02, 0x99, 0x83, 0xc0, 0x18, 0x60, 0xea,
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0xa9, 0x05, 0xd0, 0xf6, 0xea, 0xa9, 0x06, 0xd0,
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0xf1, 0xea, 0xa9, 0x07, 0xd0, 0xec, 0xa2, 0x03,
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0x38, 0x60, 0x08, 0xa5, 0x00, 0x48, 0xa9, 0x60,
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0x85, 0x00, 0x78, 0x20, 0x00, 0x00, 0xba, 0x68,
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0x85, 0x00, 0xbd, 0x00, 0x01, 0x28, 0xaa, 0x0a,
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0x0a, 0x0a, 0x0a, 0xa8, 0xa9, 0x03, 0x18, 0x90,
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0xa8, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xd6, 0xff, 0xff, 0xff, 0x01 };
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memcpy(toWhere, rom, 256);
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}
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bool Mouse::hasExtendedRom()
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{
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return true;
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}
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void Mouse::loadExtendedRom(uint8_t *toWhere, uint16_t byteOffset)
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{
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printf("loading extended rom for the mouse\n");
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for (int i=0; i<256; i++) {
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toWhere[i] = romData[i + byteOffset];
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}
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}
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