VT101 8085 CPU Fault

[Diane Bruce]

On Sun, Jan 18, 2015 at 09:47:35PM -0000, Robert Jarratt wrote:
> 
...
> > you more. Nice sharp edges to signals when they shift. Times that look
> > reasonable... Steady levels, and correct levels.
> 
> It will never be steady with a scope because the address lines won't be a regular waveform. That said they looked very different on the faulty board to how they looked on the good board.
> 

A remote possibility is the boot ROM is b0rked and it's simply running
around like a chicken without a head.
That is something a good logic analyser could tell you.

Diane
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