I built a Z80 computer for my high school senior project in the early 80s. I got CP/M mostly running; the floppy controller had some bugs I never quite worked

I built a Z80 computer for my high school senior project in the early 80s. I got CP/M mostly running; the floppy controller had some bugs I never quite worked out. Pretty much started me on the career path I've taken. I'm building a 68000 system now for fun. I know I'll never really understand my desktop, so I'd like to have at least one computer in the house that I really fundamentally understand.