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40 lines
1.1 KiB
Plaintext
40 lines
1.1 KiB
Plaintext
;-------------------------------
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; #SSI protections
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; weak bit, magic values,
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; the occasional fat track
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;
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; module by qkumba/4am
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;-------------------------------
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!zone {
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ldy gIsRDOS13
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bne .exit
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ldy #$0F
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jsr SearchTrack
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!byte WILDCARD,$00; xxx $00 (sometimes DEC, sometimes CMP)
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!byte $F0,$17 ; BEQ *+$19
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!byte $20,$65,$BC; JSR $BC65
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!byte $B0,$F7 ; BCS *-7
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!byte $C1,$00 ; CMP ($00,X)
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!byte $C1,$00 ; CMP ($00,X)
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!byte $EA ; NOP
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!byte $EA ; NOP
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bcs + ; passport-test-suite/Epidemic.woz [C=0] matches
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jsr PrintByID
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!byte s_ssi
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jsr modify1
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!byte $A9 ; LDA #$..
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+
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ldy #$09
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jsr SearchTrack
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!byte $AE,$F1,$BA; LDX $BAF1
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!byte $BD,$89,$C0; LDA $C089,X
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!byte $A9,$44 ; LDA #$22
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!byte $20 ; JSR ...
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bcs .exit ; passport-test-suite/Sixgun Shootout.woz [C=0] matches
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jsr modify1
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!byte $60 ; RTS
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.exit
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}
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