On May 8, 2016 9:26 PM, "Jeffrey Jonas via vcf-midatlantic" < vcf-midatlantic@lists.vintagecomputerfederation.org> wrote:

replying to "Lo-tech_Z80_CPU_Test_Adapter

It's an excuse for making and selling a PC board. A 40 pin DIP CLIP does that and more: for probing with a scope or logic analyzer. Most system boards don't have the space or clearance for daughterboards.

A stand alone Z80 CPU tester is just a clock source, 5V and pull-up resistors, feeding the Z80 NO-OPS. Then watch the CPU go thru its paces

-- jeffj

I know in the past people used a Sinclair zx81 or timex 1000 for this kind of thing. Easy to work with Bill Degnan twitter: billdeg vintagecomputer.net