I got a reasonably priced copy of the book "Z-80 and 8080 Assembly Language Programming" by Kathe Spracklen, 1979. It provides a clear and concise reference and comparison of the Z80 and Intel 8080 instruction sets.
I posted some notes on why I like the book:
@lopta That is a good quick introduction to the Z80 and 8080. For something more in depth, "Programming the Z80" by Rodnay Zaks is probably better.
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