Yamaha YM2413
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The YM2413, a.k.a. OPLL, is a 9-voice FM synthesis sound chip manufactured by Yamaha Corporation. It is related to Yamaha's OPL family of FM synthesis chips, being a cost-reduced version of the YM3812
YM2413 in a 18-pin DIP package
Yamaha OPL
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The OPL series is a family of sound chips developed by Yamaha. It consists of low-cost sound chips providing FM synthesis for use in computing, music and video game applications.
Yamaha YM2413
…The YM2413, a.k.a. OPLL, is a 9-voice FM synthesis sound chip manufactured by Yamaha Corporation. It is related to Yamaha's OPL family of FM synthesis chips, being a cost-reduced version of the YM3812 (OPL2). It has nine concurrent FM channels with two operators per channel, and…
Yamaha YM3812 (OPL2 chip)
Creative Labs and other companies often hid the original Yamaha labels
Decapsulated YM3812, showing the die surface
OPL3 waveforms