FM Operator Type-P
Almost same as YM2151 except TEST register usage.
FM(4op) 8ch with 1 hardware LFO
DIP24
Identical with YM2151
Yamaha FB-01
Yamaha SFG-05 (for MSX)
Yamaha DX21
Yamaha DX27
Yamaha DX100
IBM Music Feature Card
http://sr4.sakura.ne.jp/fmsound/opp.html