Writing a full interpreter for a pseudo-assembly language.

It's kinda fun but the things a bit of a cunt of a problem because I only did this once before almost a decade and a half ago.

getting just the right format and deciding on the syntax is a slog. Just need something thats quick and sufficiently expressive because I'm not writing the assembly myself, I'm generating the assembly code that runs through the interpreter, so it has to be valid under a lot of conditions.