Star Wars Tie fighter issues

Not sure this went out on the list yesterday. I was having some issues..

Anyways, back to my previous posts on the Tie fighter issues.

I got some time to sit with it, and found something interesting which I'm
not sure what to make of. I started using my bug trap to look for issues,
and when I put it on 6h part of the matrix processor counter the problem
goes away. Its an ls191 I didn't see any fault light come up on the bug
trap but went ahead and replaced. The original ls191 checked OK and the
problem still occurs. It will go away if I put the bug trap on. So I
started checking other chips that had db0 and db1 coming out. I piggybacked
the ls244 on 4j the problem went away, so I replaced it and check again.
Problem still present. If I piggy back the ls244 again no problem.

The only things that are common between the two chips are db0 and db1 so I
believe there is a problem somewhere on the DB buss.

Another observation. The problem doesn't occur when the +5 is lower than 5,
4.9 seems to be just fine. But 5.04 no good.

Is there an easy way of finding out which chip doesn't like above +5 or
should I just run it at lower than normal +5 ?

Kevin

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Received on Wed Aug 22 10:41:42 2012