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Title: Ym2151  
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Subject: Atari 7800, Sound card, Battle Garegga, Batsugun, Road Runner (video game), Paperboy (video game), CP System, Sunset Riders, Bravoman, Namco System 21
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The Yamaha YM2151, also known as OPM (FM Operator Type-M) is an eight-channel, four-operator sound chip. It was Yamaha's first single-chip FM synthesis implementation, created originally for the Yamaha DX series of keyboards.[which?] Yamaha also used it in some of their budget-priced electric pianos, such as the YPR-7, -8, and -9.

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, Capcom, Data East Pinball and Namco, with its heaviest use in the late 1980s, as well as in the Sharp X1 and Sharp X68000 home computers.

Finally, the chip was used in the Yamaha SFG-01 and SFG-05 FM Sound Synthesizer Units. These are expansion units for MSX computers and were already built into some Yamaha MSX machines like the CX5M. Later SFG-05 modules contain the YM2164 (OPP), an almost identical chip that differs only in a few undocumented registers and is otherwise identical. The SFGs were followed by the FB-01, a standalone version powered exclusively by the YM2164.

Technical details

The YM2151 was paired with either a YM3012 stereo DAC or a YM3014 monophonic DAC so that the output of its FM tone generator could be supplied to speakers as analogue audio.

A popular VSTi named VOPM, as its name suggests, emulates the YM2151. This was inspired by its author being an avid fan of the Sharp X68000, one of the various devices in which the YM2151 appeared. As well as being popular for emulating the OPM, due to the similarities between the OPM and several other Yamaha single-chip FM synthesizers, including the YM2612 in the Sega Mega Drive/Genesis, VOPM is popular among fans of various consoles and chiptune-based music for its ability to play instruments from games and very closely emulate their sounds.

See also

Yamaha YM2164


  • YM2151 Datasheet
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