Small update...
The new CPU arrived, and that did not fix the problem.
I spend a few minuted scoping lines again, and I started to to single
sweeps with the scope, and I noticed something odd on some of the lines.
It appeard to have some random spikes or dips in the logic levels. I need
to verify this when I have more time, maybe next week, but I am wondering
if there might be some contention on a bus... I need to really look at the
address lines now, I wonder if there is a bad IC on one of the address is
lines....
On Sat, Sep 10, 2016 at 4:34 PM, Louis Ciotti <lciotti1@gmail.com> wrote:
> OK so I thought I was making good progress resurrecting a paragon, but now
> I thing it may be "brain dead" . It worked the last time I had it on the
> bench, but now when that I have time to finish getting it back together,
> when I turn it on all I get is random LEDs lit up, nothing and nothing on
> the display, and no audio output. The last time it was on the bench
> everything worked, just needed to fix the headphone jack...
>
> Did the processor or memory die? Any thoughts on debugging this?
>
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