The VIC-20 Programmers Reference was also a great next step, to get you into assembly/machine language. There wasn't a good freely-available assembler, so you g

The VIC-20 Programmers Reference was also a great next step, to get you into assembly/machine language. There wasn't a good freely-available assembler, so you get to become the assembler itself, POKEing instructions into memory. https://archive.org/details/commodore-vic-20-manual-del-usuario https://archive.org/details/commodore-vic-20-manual-del-usua... https://archive.org/details/VIC-20ProgrammersReferenceGuide1stEdition6thPrinti https://archive.org/details/VIC-20ProgrammersReferenceGuide1...