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papers/doc/7-systems/ym2203.md
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# Yamaha YM2203 (OPN)
a cost-reduced version of the YM2151 (OPM).
it only has 3 FM channels instead of 8 and removes the LFO.
it only has 3 FM channels instead of 8 and removes stereo, the LFO and DT2 (coarse detune).
however it does contain an AY/SSG part which provides 3 channels of square wave with noise and envelope.
this chip was used in the PC-88/PC-98 series of computers, and in some arcade boards.
this chip was used in the NEC PC-88/PC-98 series of computers, the Fujitsu FM-7AV and in some arcade boards.
several variants of this chip were released as well, with more features.

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papers/doc/7-systems/ym2608.md
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# Yamaha YM2608 (OPNA)
like YM2203, but with twice the FM channels, an ADPCM channel and built-in drums ("rhythm")!
like YM2203, but with twice the FM channels, stereo, an ADPCM channel and built-in drums ("rhythm")!
it was one of the available sound chips for the PC-98 series of computers.
it was one of the available sound chips for the NEC PC-88VA and PC-98 series of computers.
the YM2610 (OPNB) and YM2610B chips are very similar to this one, but the built-in drums have been replaced with 6 sample channels.