mirror of https://github.com/mgcaret/rom4x.git
41 lines
916 B
ArmAsm
41 lines
916 B
ArmAsm
.code
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.psc02
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.include "iic+.defs"
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.org $fb3c ; ~165 bytes free here
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cmp #$a9 ; reset patch
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bne chk2
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jmp reset5x
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chk2: cmp #$ea ; boot patch
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bne chk3
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jmp boot5x
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chk3: cmp #$40 ; beep
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bne dowait
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; "classic air raid beep"
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; inspired by http://quinndunki.com/blondihacks/?p=2471
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jsr $fcb5 ; (new) WAIT for .1 sec delay
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ldy #$c0
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obell2: lda #$0c
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jsr owait ; old wait for correct sound
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lda $c030
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dey
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bne obell2
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bra dexit ; back to caller
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dowait: jsr $fcb5 ; do delay if anything else
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lda #>($fbe2-1) ; return to other bank here (in BELL1)
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pha ; by pushing address onto
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lda #<($fbe2-1) ; the stack
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pha
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lda #$00 ; in case someone assumes this
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dexit: jmp swrts2 ; back to other bank
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; old wait - no ACIA access to enforce delay at
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; accelerated speeds, speaker delay tkes care of it
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; when we do the old beep
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owait: sec
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owait2: pha
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owait3: sbc #$01
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bne owait3
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pla
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sbc #$01
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bne owait2
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rts
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