MSV11-D debugging question

Noel Chiappa jnc at
Wed Feb 4 16:57:38 CST 2015

Finally getting back to this:

    > From: Brent Hilpert

    >> Again, I have a sitation where a bit is stuck on, and I'm curious to
    >> see if anyone has any insight into which chip (of 3) might be causing
    >> it (in an attempt to not have to try replacing them at random :-).

    > (Are they 4116 memory chips in use?)


    > a means to isolate which of the 3 points (ICs/pins) is the problem
    > might (not guaranteed) be:
    > ...
    > If the state is only faulty after one of the accesses it suggests the
    > according mem chip is the failure point. ... distinguish the accesses
    > to the upper and lower bank to try to isolate when the circuit enters
    > the faulty state, and see whether it's common to both banks or only one.

Thank you! Thank you!! Thank You!!! That worked a treat; found the bad chip
first time! Thanks again!


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