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37 lines
487 B
NASM
37 lines
487 B
NASM
// Problem with assigning negative word constant (vwuz1=vbuc1)
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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 w = 2
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ldx #0
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__b1:
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txa
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and #1
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cmp #0
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beq __b3
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lda #<-1
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sta.z w
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lda #>-1
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sta.z w+1
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jmp __b2
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__b3:
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txa
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sta.z w
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lda #0
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sta.z w+1
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__b2:
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txa
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asl
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tay
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lda.z w
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sta screen,y
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lda.z w+1
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sta screen+1,y
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inx
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cpx #8
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bne __b1
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rts
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}
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