*[https://baltazarstudios.com/z80explorer/ Z80 Explorer] [https://baltazarstudios.com/zilog-z80-undocumented-behavior/ Complete list of Z80 instructions and their bus responses and cycles dumped from real hardware]
*[https://floooh.github.io/visualz80remix/ VisualZ80remix] [https://floooh.github.io/2021/12/06/z80-instruction-timing.html Detailed look at Z80 instruction timings with the help of a Z80 netlist simulation]
*[https://floooh.github.io/2021/12/17/cycle-stepped-z80.html Cycle-stepped Z80 emulation how-to] [https://github.com/floooh/chips/blob/master/codegen/z80_desc.yml Internal Z80 behaviour described in Yaml format]
*[https://github.com/SingleStepTests Tom Harte's SingleStepTests]
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