Microsoft BASIC for 6502 is the original assembly-language source code for Microsoft’s BASIC interpreter version 1.1, written for the MOS Technology 6502 8-bit microprocessor back in the late 1970s. It was used on pioneering personal computers (such as the Apple II, Commodore PET, etc.), enabling users to write and run programs in BASIC on those systems.
Action! - The Native Programming Language for Atari 8-bit Computers
...Action! language constructs were designed to map cleanly to 6502 opcodes.
In 2015, Clinton Parker released the Action! 3.6 source code to the public under the terms of GPL. This project is intended to preserve the Action! source code, provide fixes for known bugs, and add new features in version 3.7.
Join us at AtariAge https://forums.atariage.com/topic/217770-action-source-code for questions and discussions.
...Action! language constructs were designed to map cleanly to 6502 opcodes.
In 2015, Clinton Parker has release the Action! 3.6 source code to the public under the terms of GPL. This project is intended to preserve the Action! source code and to provide updates and fixes for known bugs.