Yamaha YM2151
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The Yamaha YM2151, also known as the OP-M (FM Operator Type-M) is a sound chip in the YM2100 family. It was Yamaha's first single-chip FM synthesis implementation, created originally for the Yamaha DX series of keyboards.
It was also used in arcade games, starting with Atari's Marble Madness, and later being licensed for use by many other companies including Sega, Konami, Data East Pinball and Namco, with its heaviest use in the late 1980s.
This chip was used in some Yamaha budget electric pianos, such as the YPR-7/8/9. It is identical to the chip in the FB-01 (YM2164), except that operator 4 of voice 8 can be used to generate noise, all other data is identical.
