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YM2608B - On Board.jpg
Developer: Yamaha
Released: c. 1987
Type: Chip

The YM2608 or LSI Operator Type-N Model A, known simply as the OPNA, is an integrated circuit created by Yamaha used to create audio wave forms using four distince methods. The chip came onto the market sometime around 1987. YM2608 is probably best known for its inclusion in the PC-8801 and PC-9801 lines of Japanese personal computers.

The YM2608 consists of four internal modules:

  • FM Sound Source - a six-channel FM synthesis sound system, based on the YM2203 (the original OPN).
  • SSG Sound Source - a complete internal implementation of the Yamaha YM2149 which can produce three channels of square wave synthesis and one noise channel.
  • ADPCM Sound Source - a single channel for samples in 8-bit ADPCM format at a sampling rate between 2-16kHz.
  • Rhythm Sound Source - a six-channel ADPCM system, enabling playback of six percussion "rhythm tones" from a built-in ROM

The YM2608 was revised at least twice signified as the YM2608A and YM2608B.


The following devices implemented the YM2608:

Release Company Device Notes
1987-??-?? NEC PC-8801 Used on models starting in 1987.
1987-?-?? NEC PC-9801 Used on models starting in 1987.


YM2608 output was featured in hundreds of games from 1987 to the late 1990s between the PC-8801 and PC-9801 computer lines from NEC.

Picture Gallery


Emulation Status

The YM2608 emulation exists in most comprehensive PC-8801 and PC-9801 emulators.