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79 lines
1.3 KiB
NASM
79 lines
1.3 KiB
NASM
// Tests using integer conditions in while() / for() / do..while
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// This should produce 'ba ba@ ba@' at the top of the screen
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// Commodore 64 PRG executable file
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.file [name="condition-integer-2.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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// while()
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.label j = 2
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ldx #0
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lda #2
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// for()
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__b1:
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// for( byte i=2;i;i--)
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cmp #0
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bne __b2
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// SCREEN[idx++] = ' '
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lda #' '
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sta SCREEN,x
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// SCREEN[idx++] = ' ';
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inx
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lda #3
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sta.z j
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__b4:
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// while( j-- )
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ldy.z j
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dey
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lda.z j
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bne __b5
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// SCREEN[idx++] = ' '
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lda #' '
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sta SCREEN,x
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// SCREEN[idx++] = ' ';
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txa
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tay
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iny
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ldx #2
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__b7:
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// SCREEN[idx++] = k
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txa
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sta SCREEN,y
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// SCREEN[idx++] = k;
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iny
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// while(k--)
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txa
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sec
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sbc #1
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cpx #0
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bne __b8
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// }
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rts
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__b8:
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tax
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jmp __b7
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__b5:
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// SCREEN[idx++] = j
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tya
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sta SCREEN,x
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// SCREEN[idx++] = j;
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inx
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sty.z j
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jmp __b4
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__b2:
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// SCREEN[idx++] = i
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sta SCREEN,x
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// SCREEN[idx++] = i;
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inx
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// for( byte i=2;i;i--)
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sec
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sbc #1
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jmp __b1
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}
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