High Quality Content by WIKIPEDIA articles! The YM2203, aka OPN (FM Operator Type-N), is a six-channel sound chip developed by Yamaha. It's the progenitor of Yamaha's OPN family of FM synthesis chips used in many videogame and computer systems throughout the 1980s and early 1990s. The YM2203 itself was used in a variety of NEC computers, along with various arcade game machines. The YM2203 and the rest of the OPN synthesizer family generate sound via frequency-modulated digital sine waves, in a 10-bit floating point number form, and fed through successive operator "cells". The resulting digital sound is mixed in a built-in digital mixer and converted to analog sound through a DAC, either with an external companion chip or an internal DAC, depending on the model.

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