This was the tersest possible listing of opcode mnemonics :/ I cobbled together a basic understanding from various machine code listings (Toni Baker, Your Sinc

This was the tersest possible listing of opcode mnemonics :/ I cobbled together a basic understanding from various machine code listings (Toni Baker, Your Sinclair IIRC), and my "assembler" was paper, pencil and a FOR/INPUT/POKE loop... My uncle loaned me a Sharp MZ700 one summer, its manual had a detailed breakdown of Z80 opcodes (in mere 4 pages) which was a revelation to me, and an annotated monitor in assembler. https://archive.org/details/sharpmz700ownersmanual https://archive.org/details/sharpmz700ownersmanual (p160-)