Commodore BASIC (also known as PET BASIC) was the operating system that came on Commodore Computers released from 1977 to 1996 before it was replaced by Amiga in 1992 or so...

It was a dialect of the BASIC programming language, based on 6502 Microsoft BASIC, like the partly compatible Applesoft BASIC was.

It was first used in the PET (1977) to the Commodore 128 (1985).

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