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The YM2413, a.k.a. OPLL, is an FM synthesis sound chip manufactured by Yamaha Corporation. It is related to Yamaha's OPL family of FM synthesis chips, and is a cost-reduced version of the YM3812 (OPL2).
Based on the YM3812, it features nine concurrent FM channels with two operators per channel. Common to the OPL family, it features a percussion mode (or rhythm mode) that turns the last three channels into percussion/rhythm channels to produce 5 percussion/rhythm sounds.
To make the chip cheaper to manufacture, many of the internal registers were removed. The result of this is that the YM2413 can only play one user-defined instrument at a time; the other 15 instrument settings are hard-coded and cannot be altered by the user. There were also some other cost-cutting modifications: the number of waveforms was reduced to two, additive mode was removed along with the 6-bit carrier volume control (channels instead have 15 levels of volume), and the channels are not mixed using an adder; instead, the chip's built-in DAC uses time-division multiplexing to play short segments of each channel in sequence, which was also done in the YM2612 much later.
The YM2413 was used in many devices, including:
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