Yamaha YMF262

The Yamaha YMF262, also known as the OPL3 (OPL is an acronym for FM Operator Type-L), is an FM synthesis sound chip. It is an improved version of the Yamaha YM3812 (OPL2).

Overview

The YMF262 improves upon the feature-set of the YM3812, adding the following features:

  • twice as many channels (18 instead of 9)
  • simple stereo (hard left, center or hard right)
  • 4 channel sound output
  • 4 new waveforms (alternating-sine, "camel"-sine, square and logarithmic sawtooth)
  • 4 oscillator mode, pairing 2 channels together to create up to six 4 oscillator FM voices
  • reduced latency for host-register access (the OPL2 had much longer I/O access delays)
  • subtle differences in the sine-wave lookup table and envelope generator from YM3812 (e.g. the modulator waveform on YM3812 is delayed by one sample, whereas both carrier and modulator waveforms on OPL3 are properly synchronized)

    • YMF262 also removed support for the little-used CSM mode, featured on YM3812 and YM3526.

    The YMF262's FM synthesis mode was configurable in different ways.

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