these are all great recommendations, particularly the TIL book, which taught me so much about Z80 assembly language, though you really only needed a little bit

these are all great recommendations, particularly the TIL book, which taught me so much about Z80 assembly language, though you really only needed a little bit to implement a forth back then - i went a bit bonkers in my implementation. i also used a a forth-like language implemented in C++ for an "adventure" writing system that taught me a lot about C++. you can't go wrong with implementing a forth if you want to learn.