MOS Technology

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MOS Technology, Inc.
MOS Technology.svg
Founded 1969
Closed 2001
Headquarters Norristown, Pennsylvania, United States

MOS Technology, Inc. (Metal-Oxide Semiconductor) was an American semiconductor manufacturer. It is best known for creating one of the most popular CPUs in history, the 6502 processor. It was the primary CPU of the Commodore 64, the Nintendo Entertainment System (integrated into the Ricoh 2A03), the Apple II, the Atari 2600 and the Atari 8-bit.

In 1976, Commodore bought MOS in order to be independent (vertical integration) and produce numerous chips for their computers. By 1980, MOS had been renamed to Commodore Semiconductor Group (CSG), though Commodore's datasheets and chips changed only gradually from 1989 to 1990.


Audio Chips

MOS switched manufacturing process a couple of times to reduce cost. On four-digit chips, the first digit reflects which process was used (in rare cases, incorrectly). The second and third digit stand for the purpose, including 8 for audio alone, and 6 for video optionally combined with audio. Often, an R and revision number follow. If a chip worked at 2, 3 or 4 Mhz, MOS added a single A, B or C, respectively. The last line begins with a four-digit date code (two digits for the week, two for the year).

Release Chip Popular Devices
1980-??-?? 6560 (VIC) VIC 20 (NTSC)
1981-??-?? 6561 (VIC) VIC 20 (PAL)
1982-0?-?? 6581 (SID) MAX MACHINE, Commodore 64, Commodore 128, Commodore 128D, Commodore 64C (early versions), SSI 2001
1984-0?-?? 7360 (TED) Commodore 116, Commodore 16, Plus/4
1984-0?-?? 8360 (TED) Commodore 116, Commodore 16, Plus/4
1985-07-23 8364 (Paula) Amiga, Commodore CDTV, Amiga CD32
1986-??-?? 8580 (SID) Commodore 64C (later versions), Commodore 128DCR

Audio Personnel