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26 lines
809 B
Plaintext
26 lines
809 B
Plaintext
;-------------------------------
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; IDRDOS16
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; identify RDOS 16-sector bootloader
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;
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; in: $0800..$08FF contains T00,S00
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; first page of track buffer also contains T00,S00
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; out: C clear if RDOS 16-sector bootloader found
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; C set otherwise
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; all registers clobbered
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; all other flags clobbered
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;-------------------------------
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!macro IDRDOS16 {
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lda #$00
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tax
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ldy #$0E
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jsr compare ; if T00,S00,$00 ==
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!byte $01
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!byte $A9,$60 ; LDA #$60
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!byte $8D,$01,$08; STA $0801
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!byte $A2,$00 ; LDX #$00
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!byte $A0,$1F ; LDY #$1F
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!byte $B9,$00,$08; LDA $0800,Y
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!byte $49 ; EOR
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; passport-test-suite/Roadwar 2000.woz [C=0] matches
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}
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