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70 lines
1022 B
NASM
70 lines
1022 B
NASM
// Fill a square on the screen
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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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.label __0 = 3
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.label __5 = 3
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.label line = 3
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.label y = 2
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.label __6 = 5
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.label __7 = 3
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lda #5
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sta.z y
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__b1:
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// (word)y*40
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lda.z y
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sta.z __5
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lda #0
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sta.z __5+1
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lda.z __5
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asl
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sta.z __6
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lda.z __5+1
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rol
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sta.z __6+1
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asl.z __6
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rol.z __6+1
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lda.z __7
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clc
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adc.z __6
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sta.z __7
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lda.z __7+1
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adc.z __6+1
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sta.z __7+1
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asl.z __0
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rol.z __0+1
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asl.z __0
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rol.z __0+1
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asl.z __0
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rol.z __0+1
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// line = SCREEN+(word)y*40
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clc
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lda.z line
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adc #<SCREEN
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sta.z line
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lda.z line+1
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adc #>SCREEN
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sta.z line+1
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ldy #5
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__b2:
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// x+y
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tya
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clc
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adc.z y
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// line[x] = x+y
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sta (line),y
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// for( byte x: 5..15)
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iny
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cpy #$10
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bne __b2
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// for( byte y: 5..15)
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inc.z y
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lda #$10
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cmp.z y
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bne __b1
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// }
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rts
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}
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