Z80 /WAIT signal question

John Robertson a1a96636 at telus.net
Thu Apr 21 14:03:56 CDT 2016

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 <spacewar at 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

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