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*[https://chatgpt.com/g/g-4N6Ts4Y3O-amstrad-cpc-engineer Amstrad CPC Engineer (by Fergus Leen)] Specialised in Z80 Assembly for the Amstrad CPC*[https://chatgpt.com/g/g-V3gsOcx7F-cpc-z80-assembly-engineer CPC Z80 Assembly Engineer (by Vassilis N. Perantzakis)] Formal, beginner-friendly Z80 assembly guide