Yamaha YMW258-F (MultiPCM)
A sound chip introduced in 1991 by Yamaha for their first General MIDI-compliant synthesizer, the Yamaha TG100. It also appeared on a number of higher-end consumer keyboards and specialized professional devices. The YMW258-F implements the GEW8 sound synthesis technology, which is PCM sample-based synthesis under Yamaha’s “Advanced Wave Modulation” (AWM) umbrella.Usage in Arcade Games
Sega used the chip in several arcade games on the Sega System Multi 32, Sega Model 1, and Sega Model 2 arcade boards. The chip as found on these boards is called MultiPCM, and has the Sega internal part number 315-5560.Contrary to popular belief, it is not a custom Sega part and is not based on the earlier SegaPCM chip, but it was named the MultiPCM as a successor to that chip.
Specifications
- 28 channels of stereo 16-bit PCM
- Hardware LFO
- 8-bit and 12-bit wave format support
- Up to 4MB of wave memory
- Full ADSR envelopes
Effects
| Effect | Description |
|---|---|
20xx | Set PCM LFO rate |
21xx | Set PCM LFO PM depth |
22xx | Set PCM LFO AM depth |