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Re:The Z80's feature discovered after 40 years [video] by rwmj on Monday October 17, 2022 @05:18AM (#33231336)
The ZX81 & Spectrum manuals had a big table of opcodes in the back so it wasn't too bad. Most of them you memorized after a while. See page 94 here: http://www.retro8bitcomputers.co.uk/Content/downloads/manual...

Other Z80 computers did have pretty capable assemblers, even with simple macros as I recall.

Re:The Z80's feature discovered after 40 years [video] by mrspuratic on Monday October 17, 2022 @07:16AM (#33232025)
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 (p160-)