Action! - The Native Programming Language for Atari 8-bit Computers
Action! is a programming language for the Atari 8-bit family of microcomputers. It features an integrated editor, a debugger, and a 6502 compiler. Action! was created by Clinton Parker and released on cartridge by Optimized Systems Software (OSS) in 1983. Its syntax is similar to that of ALGOL 68.
Action! is significant for its high performance, which allows games and graphics demos to be written in a high-level language without the use of hand-written assembly language code. ...
Micro Programming Language - A Portable Language for Micro Computers
...I have successfully compiled MPL for CP/M, DOS, Windows, Atari ST, Amiga and the Tandy Colour Computer.
MPL is designed to be tiny in every way, while implementing all the important features of BCPL & B. The result is a compiler written in a highlevel language (PASCAL) which compiles to under 16K (CP/M). The symbol table, language syntax, and bytecode are all optimized for size.
I will write a MPL Reference Manual in time. Contact myself if you want to help get that written.