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Microsoft open-sources its 6502 version of BASIC from 1976

“In 1977, Commodore licensed it for a flat fee of $25,000, a deal that placed Microsoft BASIC at the heart of Commodore’s PET ...
XDA Developers on MSN15h

Microsoft just made its own code from the 70s open source, and you can download it right now

Microsoft just open-sourced 6502 BASIC (BASIC M6502 8K VER 1.1) from 1978. The code powered the Commodore PET, VIC-20, and ...