mirror of https://github.com/a2-4am/passport.git
28 lines
808 B
Plaintext
Executable File
28 lines
808 B
Plaintext
Executable File
;-------------------------------
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; #BADEMU
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; RWTS checks for timing bit by
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; checking if data latch is still
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; $D5 after waiting "too long"
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; but this confuses legacy emulators
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; (AppleWin, older versions of MAME)
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; so we patch it for compatibility
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; e.g. Dino Dig, Make A Face
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;-------------------------------
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_bademu
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lda gIsRWTS ; if DOS 3.3 RWTS
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bne bademu_exit
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lda #$03
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ldx #$4F
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ldy #$11
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jsr compare ; and T00,S03,$4F ==
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!byte $BD,$8C,$C0,$10,$FB,$C9,$D5,$D0
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!byte $F0,$EA,$BD,$8C,$C0,$C9,$D5,$F0
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!byte $12
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bcs bademu_exit
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lda #$03
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ldx #$58
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ldy #$02
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jsr modify ; and set T00,S03,$58 =
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!byte $F0,06
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bademu_exit
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