Overview

• Microsoft posted the complete assembly-language source for Microsoft BASIC version 1.1 targeting the MOS 6502 to a public GitHub repository.
• The code is licensed under MIT, permitting unrestricted reuse including commercial distribution.
• The source supports conditional builds for multiple systems, including the Apple II, Commodore PET, Ohio Scientific machines, and the MOS Technology KIM-1.
• This version includes 1978 garbage-collector fixes credited to Commodore engineer John Feagans alongside Bill Gates.
• Commodore licensed the 6502 BASIC in 1977 for a reported $25,000, placing it in the PET and later the VIC-20 and Commodore 64.