48 lines
1.9 KiB
NASM
48 lines
1.9 KiB
NASM
;=======================================
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; SPC engine changes
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;
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; Free space at $040F-07FF (probably)
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;
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; If we ever switch to ASAR we can rewrite
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; this as actual SPC asm instead of this
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; db jank.
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; seek($0700)
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db $68, $F0 ; CMP A,#$F0 ; the thing we overwrote
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db $D0, $03 ; BNE +
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db $5F, $81, $0A ; JMP SilenceSong ; ($0A81)
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db $68, $FA ; + : CMP A,#$FA ; new mute command $FA
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db $D0, $1C ; BNE +
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db $C4, $F4 ; MOV $F4,A
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db $E8, $00 ; MOV A,#$00
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db $C5, $4A, $0A ; MOV $0A4A,A ; $0A49: MOV A,#$70 -> MOV A,#$00
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db $C5, $F3, $0A ; MOV $0AF3,A ; $0AF2: MOV $059,#$C0 -> MOV $059,#$00
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db $C5, $32, $0C ; MOV $0C32,A ; $0C32: MOVW $058,YA -> NOP #2
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db $C5, $33, $0C ; MOV $0C33,A
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db $E8, $C4 ; MOV A,#$C4 ; $0D19: MOVW $058,YA -> MOV $058,A
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db $C5, $19, $0D ; MOV $0D19,A
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db $E8, $58 ; MOV A,#$58
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db $C5, $1A, $0D ; MOV $0D1A,A
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db $2F, $23 ; BRA ++
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db $68, $FB ; + : CMP A,#$FB ; new unmute command $FB
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db $F0, $03 ; BEQ +
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db $5F, $9D, $0A ; JMP NewSongInput ; ($0A9D)
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db $C4, $F4 ; + : MOV $F4,A
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db $E8, $70 ; MOV A,#$70
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db $C5, $4A, $0A ; MOV $0A4A,A ; $0A49: MOV A,#$70
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db $E8, $C0 ; MOV A,#$C0
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db $C5, $F3, $0A ; MOV $0AF3,A ; $0AF2: MOV $059,#$C0
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db $E8, $DA ; MOV A,#$DA
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db $C5, $32, $0C ; MOV $0C32,A ; $0C32: MOVW $058,YA
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db $C5, $19, $0D ; MOV $0D19,A ; $0D19: MOVW $058,YA
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db $E8, $58 ; MOV A,#$58
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db $C5, $33, $0C ; MOV $0C33,A
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db $C5, $1A, $0D ; MOV $0D1A,A
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db $3F, $81, $0A ; ++ : CALL SilenceSong ; ($0A81)
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db $E4, $F4 ; - : MOV A,$F4
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db $D0, $FC ; BNE -
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db $64, $F4 ; CMP A,$F4
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db $D0, $F8 ; BNE -
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db $FA, $00, $F4 ; MOV $F4,#$00
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db $6F ; RET
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