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I used this reference to write a CHIP-8 emulator in Z80 assembly a couple years back: https://github.com/mnurzia/chip8-ce

I enjoyed your commentry on the registers (HL, BC, DE), but you mention a lack of index-registers? Isn't that what IX and IY are for?

(You can do things like "ld a, (ix+3)", etc. I used those a lot when I recently wrote a text-based adventure game in Z80.)