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40 lines
814 B
NASM
40 lines
814 B
NASM
// Fill screen using a pointer
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// Commodore 64 PRG executable file
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.file [name="fillscreen-3.prg", type="prg", segments="Program"]
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.segmentdef Program [segments="Basic, Code, Data"]
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.segmentdef Basic [start=$0801]
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.segmentdef Code [start=$80d]
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.segmentdef Data [startAfter="Code"]
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.segment Basic
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:BasicUpstart(main)
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.label SCREEN = $400
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.segment Code
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main: {
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.label dst = 2
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lda #<SCREEN
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sta.z dst
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lda #>SCREEN
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sta.z dst+1
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__b1:
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// for(char* dst = SCREEN; dst!=SCREEN + 1000; dst++)
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lda.z dst+1
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cmp #>SCREEN+$3e8
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bne __b2
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lda.z dst
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cmp #<SCREEN+$3e8
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bne __b2
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// }
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rts
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__b2:
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// *dst = ' '
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lda #' '
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ldy #0
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sta (dst),y
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// for(char* dst = SCREEN; dst!=SCREEN + 1000; dst++)
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inc.z dst
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bne !+
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inc.z dst+1
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!:
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jmp __b1
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}
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