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https://github.com/catseye/SixtyPical.git
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50 lines
940 B
Plaintext
50 lines
940 B
Plaintext
word screen @ 1024
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byte joy2 @ $dc00
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word delta
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define read_stick routine
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inputs joy2
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outputs delta
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trashes a, x, z, n
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{
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ld x, joy2
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ld a, x
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and a, 1 // up
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if z {
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copy $ffd8, delta // -40
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} else {
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ld a, x
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and a, 2 // down
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if z {
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copy word 40, delta
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} else {
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ld a, x
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and a, 4 // left
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if z {
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copy $ffff, delta // -1
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} else {
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ld a, x
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and a, 8 // right
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if z {
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copy word 1, delta
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} else {
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copy word 0, delta
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}
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}
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}
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}
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}
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define main routine
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inputs joy2
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outputs delta
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trashes a, x, z, n, screen
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{
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repeat {
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call read_stick
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copy delta, screen
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ld a, 1
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} until z
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}
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