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28 lines
502 B
NASM
28 lines
502 B
NASM
// Fill screen using an efficient char-based index
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.pc = $801 "Basic"
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:BasicUpstart(main)
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.pc = $80d "Program"
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.label SCREEN = $400
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main: {
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ldx #0
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__b1:
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// for(char i=0;i<250;i++)
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cpx #$fa
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bcc __b2
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// }
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rts
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__b2:
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// SCREEN[i] = ' '
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lda #' '
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sta SCREEN,x
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// (SCREEN+250)[i] = ' '
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sta SCREEN+$fa,x
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// (SCREEN+500)[i] = ' '
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sta SCREEN+$1f4,x
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// (SCREEN+750)[i] = ' '
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sta SCREEN+$2ee,x
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// for(char i=0;i<250;i++)
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inx
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jmp __b1
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}
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