Sunsoft 5B audio
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The Sunsoft 5B is a superset of the Sunsoft FME-7. It is identical to the FME-7 except it contains extra audio hardware. This audio hardware was only used in one game, Gimmick!
Registers
The audio hardware is a type of the General Instrument AY-3-8910 PSG, or Yamaha's YM2149F variant.
Writing $C000 selects an internal hardware register.
Writing $E000 writes data to the internal register.
