Related Chips
Yamaha used the YM2149F core to produce a whole family of music chips which were used in mobile phones, home computers, home and arcade video game systems, etc. For example, the YM2203 (also known as OPN) is a YM2149F plus FM. As well as its far more advanced successors: the YM2608 (also known as OPNA) which retained all previous features and greatly expanded upon those, the YM2612 (also known as OPN2) which was a cut-down YM2608 and removed many features including the YM2149F sound channels and I/O ports, and the YM2610 (OPNB) which added other features and retained the YM2149F sound but not the I/O ports.
Read more about this topic: General Instrument AY-3-8910
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