w.o.p.r.
This video is about programming the Intel 8080, 8085 and Zilog Z80 in Assembler
Arithmetic subtraction
Z80 part: https://youtu.be/IArz3H5Aq2s?t=882 (14 min 42 sec) ... https://www.youtube.com/watch?v=IArz3H5Aq2s
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