Steve Ciarcia’s Byte magazine articles are a great read (in fact all of Byte was great) - being enthralled by them as a kid but not understanding them probably had a large effect on me choosing to study electronics.
Radio Shack had a book on the Z80, that I think was the same as the Howard Sams book, but with a different cover. It was so clearly written, that even to this day, my ability to conceptualize the innards of computers is strongly biased by the Z80 architecture.