The PSG is quite primitive. It is able to output a square wave and/or white noise in three separate sound channels (named Channel A, B and C).
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Some other 8-bit systems used more sophisticated soundchips such as the SAA1099, the C64 [[SID]], the Mullard/Philips SAA1099, the NES APU and the Gameboy soundchip.
== PSG Part numbers used in the CPC during its lifetime ==