Yamaha YM2612

The YM2612, a.k.a. OPN2, is a sound chip developed by Yamaha. It is a member of Yamaha's OPN family of FM synthesis chips, and was developed as a stripped-down version of the YM2608.

The YM2612 is a six-channel FM synthesizer used in several game and computer systems, most notably in Sega's Mega Drive/Genesis video game console as well as Fujitsu's FM Towns computer series. It was also available in CMOS form as the YM3438, a.k.a. OPN2C.

As with the YM3438, it was used by Sega in various arcade game systems, including the Mega-Play, Sega System C and Sega System 32; the YM3438 core was also integrated into an ASIC in later revisions of the Mega Drive/Genesis.

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