YM2608

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YM2608
YM2608B - On Board.jpg
Developer: Yamaha
Released: c. 1987
Type: Chip
Channels:

1.) Pulse Wave
2.) Pulse Wave
3.) Pulse Wave
4.) Noise
5.) FM Synthesis
6.) FM Synthesis
7.) FM Synthesis
8.) FM Synthesis
9.) FM Synthesis
10.) FM Synthesis
11.) PCM (16 KHz)
12.) PCM
13.) PCM
14.) PCM
15.) PCM
16.) PCM
17.) PCM

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:

  • SSG Sound Source - A complete internal implementation of the Yamaha YM2149 which can produce three channels of pulse wave synthesis and one noise channel.
  • FM Sound Source - A six-channel FM synthesis sound system, based on the YM2203 (the original OPN).
  • 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 identified as the YM2608A and YM2608B.

Devices

The following devices implemented the YM2608:

Release Company Device Notes
1987-??-?? NEC PC-8801-23 An internal sound card for the PC-8801.
1987-??-?? NEC PC-9801-86 An internal sound card for the PC-9801.
1992-01-?? NEC PC-9801 NEC began building these directly into the motherboards around this time.
199?-??-?? NEC PC-8801 NEC began building these directly into the motherboards around this time.

Games

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

Downloads

Document Download
Manual (Translated from Japanese) Download - (info)

Emulation Status

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

Links