Microsoft BASIC for 6502 Microprocessor
 

https://opensource.microsoft.com/blog/2025/09/03/microsoft-open-source-historic-6502-basic/


Microsoft has opened source code of BASIC for 6502 Microprocessor - Version 1.1

https://github.com/microsoft/BASIC-M6502

This assembly language source code represents one of the most historically significant pieces of software from the early personal computer era. It is the complete source code for Microsoft BASIC Version 1.1 for the 6502 microprocessor, originally developed and copyrighted by Microsoft in 1976-1978.

It was wrote by RickWeiland and Bill Gates.(bill's blog)
https://prnt.sc/uqSRSva_OQ3J