* [https://zxe.io/software/Z80/ libZ80] Ultra accurate ANSI C implementation
* [[arnold]] uses [[InkZ80]], written in C++ (taken from the [http://www.inkland.org.uk/inkspector/index.htm InkSpector] ZX Spectrum emulator)
* [https://opencores.org/projects/a-z80 A-Z80] Ultra accurate Verilog implementation[https://view.officeapps.live.com/op/view.aspx?src=https%3A%2F%2Fraw.githubusercontent.com%2Fgdevic%2FA-Z80%2Frefs%2Fheads%2Fmaster%2Fcpu%2Fcontrol%2FTimings.xlsm A-Z80 Timing Table]
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