prog8/examples/test.p8

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%import textio
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main {
; $1F9C0 - $1F9FF PSG registers
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sub start() {
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txt.print("tone")
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uword freq = 1181
cx16.vpoke(1, $f9c0, lsb(freq))
cx16.vpoke(1, $f9c1, msb(freq))
cx16.vpoke(1, $f9c2, %11111111) ; volume
cx16.vpoke(1, $f9c3, %11000000) ; triangle waveform
}
}