RetroChallenge 2017/10 – and the beat goes on

Yesterday I checked the voltages with my DMV and everything looked OK. Today I checked with the ‘scope just to check for ripple and they all look pretty clean to me.

Clocks

I also saw that there was a running clock but overnight I became increasing worried that it wasn’t a very good clock.

Here’s the circuit…

It doesn’t look too tricky.

Check with the scope.

A scope trace shows it’s a bit funny. I’m not sure quite what the Z80 needs but I thought it should have a better back edge than that.

More thought needed.

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