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Re:Z80 arithmetic: also surprisingly terrible (2018) by Accacin on Monday January 14, 2019 @04:49AM (#18901892)
This is a nice read for someone who has just started to learning GB ASM, I know the processor in the game boy isn't exactly a Z80 (or an 8080) but it's quite similar.
Re:Z80 arithmetic: also surprisingly terrible (2018) by vanderZwan on Monday January 14, 2019 @06:33AM (#18902262)
I would recommend Z80 Assember In 28 Days instead

http://tutorials.eeems.ca/