Looks like an ALGOL type language. It was for the Atari 8 bit series. Possible it can be ported to C: https://cc65.github.io/ https://cc65.github.io/ That is

Looks like an ALGOL type language. It was for the Atari 8 bit series. Possible it can be ported to C: https://cc65.github.io/ https://cc65.github.io/ That is a C compiler for 6502 based systems.