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The YM2413, aka OPLL, is a cost-reduced FM synthesis sound chip manufactured by Yamaha Corporation and based on their YM3812 (OPL2). 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 other cost-cutting modifications: the number of waveforms was reduced to two, and the channels are not mixed using an adder; instead, the chip's DAC uses time-division multiplexing to play short segments of each channel in sequence, as also done in the YM2612. ==List of YM2413 Applications == *The YM2413 was used on the MSX-Music sound expansion on the MSX and on the Sega SG-1000 Mark III / Master System. *The YM2413 was used in the Yamaha PSR-6 keyboard (ca. 1989). *The YM2413 was used in an arcade board design produced by SNK and Alpha Denshi in the late 1980s for a number of its games. Games using the design include ''Time Soldiers'', ''Sky Soldiers'', and ''Gang Wars''. *It is also used in the Yamaha PSS 140 and PSS 170. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Yamaha YM2413」の詳細全文を読む スポンサード リンク
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