Relevant datasheets:
*[[Media:YMF288.pdf|OPN3 (ymf288) (Japanese)]]
*[[Media:YM2608J Translated.pdf|YM2608 OPNA (ym2608) (English)]]The OPN3 chip is mostly a light version of the YM2608 OPNA with some functionalities removed: no external ADPCM, no CSM and no GPIO.
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