cc65 provides a compiler suite and runtimes for many old 6502 machines. It really is a cool project. https://github.com/cc65/cc65 https://github.com/cc65/cc6

cc65 provides a compiler suite and runtimes for many old 6502 machines. It really is a cool project. https://github.com/cc65/cc65 https://github.com/cc65/cc65 It provides some template configuration files describing different memory layouts. And provides common libraries for input/output. There's also a LLVM fork for MOS: https://github.com/llvm-mos/llvm-mos https://github.com/llvm-mos/llvm-mos They've got some interesting hacks with ZeroPage memory and register allocation: https://llvm-mos.org/wiki/Code_generation_overview https://llvm-mos.org/wiki/Code_generation_overview Interesting if you geek out on that kind of research.