This is the data sheet for the Yamaha YM3526 OPL FM synthesizer
chip used in the Commodore C64/C128 Sounder Expander cartridge.
Anyone wishing to program the YM3526 should refer to one of the
many documents available on the internet on programming the OPL
FM synthesizer used in Creative SoundBlaster cards.
According to Magnus Eriksson, the YM3526 should not be confused
with OPL2 (YM3812) or OPL3 (YMF262).
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