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The PSG chip family is composed of 3 variants: * the AY-3-8910 with two 8-bit I/O ports, and 40-pin package* the AY-3-8912 with one 8-bit I/O port and 28-pin package* the AY-3-8913 with no I/O port. and 24-pin packageIn addition to the CPC, these chips were also used in the [[KC Compact]], [[ZX Spectrum]], [[MSX]], [[Oric-1/Atmos|Oric]], [[EG2000 Colour Genie]], [[Vectrex]], [[Intellivision]] and in the Mockingboard expansion for the [[Apple II]].