MOS Technology 6581

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The MOS Technology 6581/8580 SID (Sound Interface Device) is the built-in programmable sound generator chip of the Commodore CBM-II, Commodore 64,^[1] Commodore 128, and MAX Machine home computers.

Together with the VIC-II graphics chip, the SID was instrumental in making the C64 the best-selling home computer in history,^[2] and is partly credited for initiating the demoscene.