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27 lines
280 B
ArmAsm
27 lines
280 B
ArmAsm
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; Ullrich von Bassewitz, 29.12.1999
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; CC65 runtime: Decrement eax by value in Y
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;
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.export deceaxy
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.importzp sreg, tmp1
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deceaxy:
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sty tmp1
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sec
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sbc tmp1
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sta tmp1
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txa
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sbc #0
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tax
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lda sreg
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sbc #0
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sta sreg
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lda sreg+1
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sbc #0
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sta sreg+1
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lda tmp1
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rts
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