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46 lines
654 B
NASM
46 lines
654 B
NASM
// Tests simple word pointer iteration
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.pc = $801 "Basic"
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:BasicUpstart(main)
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.pc = $80d "Program"
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main: {
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.label SCREEN = $400
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.label w = 5
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.label wp = 2
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.label idx = 4
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ldx #0
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txa
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sta idx
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lda #<words
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sta wp
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lda #>words
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sta wp+1
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b1:
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ldy #0
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lda (wp),y
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sta w
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iny
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lda (wp),y
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sta w+1
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inc wp
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bne !+
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inc wp+1
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!:
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lda w
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ldy idx
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sta SCREEN,y
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iny
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lda w+1
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sta SCREEN,y
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iny
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tya
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clc
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adc #1
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sta idx
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inx
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cpx #4
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bne b1
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rts
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// Clever word array that represents C64 numbers 0-7
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words: .word $3130, $3332, $3534, $3736
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}
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