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.
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
- Two interval timers
- A low frequency oscillator (LFO)
- Three SSG square wave tone/noise channels: compatible with YM2149
- Seven adaptive differential 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, 2–55.5 kHz sampling rate at 16-bit from 4-bit data
The YM2610B variant added two extra FM channels for a total of six, but was identical in every other feature. The YM2610 is used in conjunction with a YM3016 stereo DAC.
References
- "Taito Museum". System 16: The Arcade Museum. Retrieved 27 October 2020.
- "ACME: New Product Review". RePlay. Vol. 15, no. 7. April 1990. pp. 50–60.
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