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35 lines
811 B
ArmAsm
35 lines
811 B
ArmAsm
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; Marco van den Heuvel, 2018-04-08
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;
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; unsigned char detect_scpu (void);
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;
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;/* Check for the presence of the SuperCPU cartridge.
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; *
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; * Possible return values:
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; * 0x00 : SuperCPU cartridge not present
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; * 0x01 : SuperCPU cartridge present
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; */
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.export _detect_scpu
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.include "accelerator.inc"
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_detect_scpu:
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ldx #$00
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txa
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; Make sure the current CPU is a 65816
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clc
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.byte $E2,$01 ; NOP #$01 on 6510 and 65(S)C02, LDA $(01,S),Y on 65CE02 and 4510, SEP #$01 on 65816
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bcc not_found ; carry will be set on 65816
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; 65816 has been detected, make sure it's the SuperCPU cartridge
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lda SuperCPU_Detect
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asl
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bcs not_found
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found:
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lda #$01
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not_found:
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rts
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