Not the author but I bought a book about assembler for my Sinclair ZX81. I just discovered it's got a Wikipedia page https://en.wikipedia.org/wiki/Programming_t

Not the author but I bought a book about assembler for my Sinclair ZX81. I just discovered it's got a Wikipedia page https://en.wikipedia.org/wiki/Programming_the_Z80 https://en.wikipedia.org/wiki/Programming_the_Z80 Edit: wow, see this comment of elvis70 > The author has made his book freely available : http://www.z80.info/zaks.html http://www.z80.info/zaks.html