Yamaha Y8950

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Yamaha Y8950 is a sound chip, produced in 1984. This model was used in MSX-Audio cartridge for MSX personal computer.

This chip was introduced in three cardridge models:

  • Philips NMS-1205
  • Toshiba HX-MU900
  • Panasonic FS-CA1


  • Compatibility with Yamaha YM-3526 model
  • Two sound-generation modes available: Simultaneous sounding of nine tones or Six melodies and five rhythms (Compatible with the Character and Pattern Telephone Access information Network system and Teletex).
  • Built-in vibrato and AM oscillators
  • Built-in accelerated 4-bit ADPCM speech analysis/synthesis circuits
  • Possibility of connecting External 256-kB RAM plus 256-kB ROM
  • Built-in 8-bit input/output ports for keyboard scanning
  • Built-in 4-bit general purpose I/O port
  • Two Built-in general purpose timers
  • TTL compatible input/output
  • Si-gate CMOS LSI
  • 5V single power supply
  • 64-pin SDIP encapsulation (same used on V9938)

Software Support

Y-8950 is supported by almost all software which contains music composed in SoundTracker, Moonblaster, Oracle, Super Music Editor or Magic Music Module Combi, etc. All these editors support the ADPCM sample unit. Some support the keyboard. Other software which makes use of the ADPCM sampler. E.g. Trax Player by NOP (a program to play songs (samples) directly from disk, while loading). Actually, probably all Compile software, that supports FM-PAC also supports MSX Audio Software, which requires the 256 kB of sample RAM.


External links