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42 lines
763 B
Lua
42 lines
763 B
Lua
%import c64utils
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%import c64lib
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~ main {
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sub start() {
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c64.SCROLY &= %11101111 ; blank the screen
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c64utils.set_rasterirq_excl(40)
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while(true) {
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}
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}
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}
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~ irq {
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const ubyte barheight = 4
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ubyte[13] colors = [6,2,4,5,15,7,1,13,3,12,8,11,9]
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ubyte color = 0
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ubyte ypos = 0
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sub irq() {
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Y++ ; slight timing delay to avoid rasterline transition issues
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ubyte rasterpos = c64.RASTER
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if color!=len(colors) {
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c64.EXTCOL = colors[color]
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color++
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c64.RASTER = rasterpos+barheight
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}
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else {
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ypos += 2
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c64.EXTCOL = 0
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color = 0
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c64.RASTER = sin8u(ypos)/2+40
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}
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}
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}
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