Yamaha YM2610

The YM2610, a.k.a. OPNB, is a sound chip developed by Yamaha. It is a member of Yamaha's OPN family of FM synthesis chips, and related to the YM2608. The YM2610 was used in conjunction with a YM3016 stereo DAC.

Yamaha YM2610

The YM2610 was used in Taito's arcade system boards from 1987, including the Taito Z System.[1] It was most notably used in SNK's Neo Geo arcade and home video game systems from 1990, along with other arcade game systems.

The YM2610 has the following features:

  • Four concurrent FM synthesis channels (voices), four operators per channel, requires YM3016 DAC
  • Two interval timers
  • A low frequency oscillator (LFO)
  • Three SSG square wave tone channels: compatible with YM2149 (used in Atari ST)
  • One SSG programmable noise channel: compatible with YM2149
  • Seven pulse-code modulation (PCM) channels[2]
    • ADPCM-A: Six ADPCM channels, fixed pitch, 18.5 kHz sampling rate at 12-bit from 4-bit data
    • ADPCM-B: One ADPCM channel, variable pitch, 18.5–55.5 kHz sampling rate
  • Two 8-bit general purpose IO ports: compatible with YM2149

The YM2610B variant added two extra FM channels for a total of six, but was identical in every other feature.

See also

References
  1. "Taito Museum". System 16: The Arcade Museum. Retrieved 27 October 2020.
  2. "ACME: New Product Review". RePlay. Vol. 15 no. 7. April 1990. pp. 50–60.


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