https://opensource.microsoft.com/blog/2025/09/03/microsoft-open-source-historic-6502-basic/
https://github.com/microsoft/BASIC-M6502
Commodore
Commodore BASIC, also known as PET BASIC or CBM-BASIC, is the dialect of the BASIC programming language used in Commodore International’s 8-bit home computer line, stretching from the PET (1977) to the Commodore 128 (1985). The core is based on 6502 Microsoft BASIC, and as such it shares many characteristics with other 6502 BASICs of the time, such as Applesoft BASIC.
6502 Assembly
6502 assembly is a low-level programming language used to write instructions for the MOS Technology 6502 microprocessor, a popular 8-bit processor from the 1970s. The 6502 was used in systems like the Apple II, Commodore 64, Atari 2600, and Nintendo Entertainment System (NES).