MATRIXSYNTH: Sammich FM synthesizer Un-assemble DIY kit Yamaha YMF262 OPL3 sound chip

Thursday, April 19, 2018

Sammich FM synthesizer Un-assemble DIY kit Yamaha YMF262 OPL3 sound chip

via this auction

You can find some videos featuring the YMF262 in the archives.

"The Yamaha YMF262, also known as the OPL3 (OPL is an Acronym for FM Operator Type-L), is an Frequency modulation synthesis Sound chip released by Yamaha Corporation in 1988. It is an improved version of the Yamaha YM3812 (OPL2). It was used in a number IBM PC soundcards including Sound Blaster 16 and Pro AudioSpectrum (16bit). It adds the following features:

The YMF262 improved upon the feature-set of the YM3812, adding the following features:[1]

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 to YM3812 (e.g. the modulator waveform on YM3812 is delayed by one sample, whereas both carrier and modulator waveforms on OPL3 are properly synchronized)[2]
YMF262 also removed support for the little-used CSM mode, featured on YM3812 and YM3526.[2]

The YMF262's FM synthesis mode is configurable in different ways:[1]

Its basic mode provides 18 two-operator FM channels.

One setting, common to the OPL line, converts 3 of the FM channels into a 5-channel percussion set.

Another setting, introduced with this chip, causes 12 of the channels to be paired up into six four-operator channels. This trades in polyphony for more complex sound formation.

The two settings can be used separately or in conjunction, resulting in four total modes:

18 2-operator channels
15 2-operator channels + 5 drum channels (drum setting on)
6 2-operator channels + 6 4-operator channels (4-op setting on)
3 2-operator channels + 6 4-operator channels + 5 drum channels (both settings on)
Like its predecessor, the OPL3 outputs audio in digital-I/O form, requiring an external DAC chip like the YAC512."

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