Early in my career I was basically a Z80 assembly specialist and I think owning a Spectrum and buying a book that was an annotated disassembly helped pique my i

Early in my career I was basically a Z80 assembly specialist and I think owning a Spectrum and buying a book that was an annotated disassembly helped pique my interest. I distinctly remember being very clueless when I first got the book - I was confused at the very first line of code - it was XOR A and I didn't immediately understand this trick to clear the accumulator in one byte not the two that MOV A,0 needed.