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46 lines
1.2 KiB
ArmAsm
46 lines
1.2 KiB
ArmAsm
;
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; Marco van den Heuvel, 2018-04-30
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;
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; unsigned char detect_turbomaster (void);
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;
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;/* Check for the presence of a Turbo Master cartridge.
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; *
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; * Possible return values:
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; * 0x00 : TurboMaster cartridge not present
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; * 0x01 : TurboMaster cartridge present
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; */
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.export _detect_turbomaster
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.include "accelerator.inc"
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_detect_turbomaster:
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lda #$00
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tax
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; Make sure the current CPU is not a 6510
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.byte $1A ; NOP on 8502, INA on 65(S)C(E)02, 4510 and 65816
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beq not_found
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; Make sure the current CPU is not a 65816
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clc
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.byte $E2,$01 ; NOP #$01 on 65(S)C02, LDA $(01,S),Y on 65CE02 and 4510, SEP #$01 on 65816
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bcs not_found ; carry will be set on 65816
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; Make sure the current CPU is not a 65CE02/4510
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.byte $A3,$A3 ; NOP NOP on 65(S)C02 and LDZ #$00 on 65CE02 and 4510
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.byte $6B ; NOP on 65(S)C02 and TZA on 65CE02 and 4510
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cmp #$A3
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beq not_found
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; Check for turbo master basic replacement
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ldy TURBOMASTER_DETECT
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cpy #$A2
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beq found
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not_found:
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txa
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found:
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rts
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