In addition to Turing Complete, which is really good, Code: The Hidden Language of Computer Hardware and Software is a fantastic book that literally goes from two kids trying to talk to each other at night with flashlights, to a fully working Z80 clone, while not being hard to understand and using a really good conversational teaching method. It’s how I figured out a lot about CPU design, microarchitectures, assembly and machine langauge and a lot of other things.