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https://github.com/fumiama/c64-snake.git
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31 lines
390 B
NASM
31 lines
390 B
NASM
.macro print
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pha
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tya
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pha
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lda #<_1 ; 取参数的低八位
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ldy #>_1 ; 取参数的高八位
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jsr printstr
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pla
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tay
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pla
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.macend
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; PRINTSTR routine. Accumulator stores the low byte of the address,
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; X register stores the high byte.
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.scope
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.data zp
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.space _ptr 2
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.text
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printstr:
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sta _ptr
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sty _ptr+1
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ldy #$00
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_lp:
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lda (_ptr),y
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beq _done
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jsr chrout
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iny
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bne _lp
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_done:
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rts
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.scend |