Yamaha YMW258-F

From Sega Retro

The Yamaha YMW258-F is 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.

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.

Technical specifications

The MultiPCM has the following technical specifications.[1]

  • Manufacturer: Yamaha
  • Sega part number: 315-5560
  • Yamaha part numbers: YMW258-F / GEW8 / YMFA1005
  • Audio output: Stereo
  • PCM audio channels: 28
  • Audio bit depth: 16‑bit
  • Sample rate: 44.1 kHz (CD quality)