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Yamaha Ym3526The YM3526, better known as OPL, is a sound chip manufactured by Yamaha and using frequency modulation synthesis. It was aimed at the low cost market. It had 9 channels with 2 operators each. It's follow-up was the popular YM3812 (OPL2), to which it was very similar - the OPL2 added only the possibility of using 4 different waveforms instead of only sine wave, and was backwards compatible. The YM3526 (OPL) was used in a Commodore 64 expansion, the Sound Expander which was never very popular, as well as several Arcade games, such as Bubble Bobble. A very closely related chip was the Y8950, or MSX-AUDIO, which was used as an MSX expansion. It was basically a YM3526 (OPL) with the added capability of playing ADPCM Samples. The very similar YM2413 was more popular though.
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