I do know that the Wait signal was used by the Fluke 90 tester so it could be clamped on top of an in circuit Z80 and run memory and I/O tests while the CPU was doing its regular operations.
On vacation so haven't easy access to the operators manual for the Fluke 90 though... John :-#)# > On Apr 21, 2016, at 1:36 PM, Eric Smith <space...@gmail.com> wrote: > > A friend building a Z80 system asked me about whether the Z80 /WAIT > signal has any effect during machine cycles that aren't > memory/IO/intack cycles (i.e., neither /MREQ and /IORQ asserted). The > user manual only describes the use of /WAIT for adding wait states, so > I expect it probably only affects mem/IO/intack cycles, but I can't > find anything definitive in the user manual. > > I'm hoping someone can save me the time of hooking up a logic analyzer > and running the experiment. > > Thanks! > Eric