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51 lines
1.3 KiB
Plaintext
51 lines
1.3 KiB
Plaintext
;-------------------------------
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; IDMilliken
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; identify Milliken protection routine
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; in late-stage boot
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;
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; in: $B600..$BFFF contains RWTS that can read this disk
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; $B747..$B749 contains "JMP $9B03"
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; out: C clear if Milliken protection routine 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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!zone {
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IDMilliken
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; protection routine starts on T00,S0A (by this point we've
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; already identified a marker on T00,S01 that strongly
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; suggests the presence of this routine, so it's worth
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; doing an extra disk read here to be sure)
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ldx #$00
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ldy #$0A
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tya
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clc
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adc #BASEPAGE
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sta gAddress+1
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jsr ReadSectorXY
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bcs .exit
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IDMilliken1
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; variant 1 (seen in Gulp and Frenzy, Tangram Puzzler)
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lda #$0A
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ldx #$03
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ldy #$0E
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jsr compare
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!byte $A9,$AE,$8D,$00,$04,$4C,$99,$AD
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!byte $AE,$F8,$05,$BD,$89,$C0
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bcs + ; passport-test-suite/Tangram Puzzler.woz [C=0] matches
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lda #TRUE
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sta gIsMilliken1
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bcc .exit
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+
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; variant 2 (seen in The Writing Workshop)
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ldy #$0B
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jsr compare
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!byte $A9,$AE,$8D,$00,$04,$AE,$F8,$05
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!byte $BD,$89,$C0
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.exit
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rts
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}
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