System 6 Tech: Thoughts needed

craigmack

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Jul 1, 2010
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Marietta, Georgia
Making good progress on this Gorgar thanks to many different people so far. Game was totally dead and is now back up and running.

To date here is what has been done:

-Replaced 40 pin interconnect
-Socketed every chip on the MPU
-New 5101
-New 6821 Solenoid PIA with socket on driver board
-New TIP42 to address super bright column 4 lamps.

A few issues remain.

First the "E" inlane rollover and the neighboring outlane switch
register about 25% of the time. The switches look clean and are
properly gapped. More often than not a successful switch register of
the inline switch will cause the displays to bug out showing the exact
same pattern as when I had a bad solenoid PIA _0_0_ . The displays show every other digit and they are either 0's or 8's in most cases, sometimes random garbage.

Is it a bad switch matrix PIA, lamp matrix PIA or display PIA now?
They are all the crappy AMI brand. I have also noticed that the
displays will do the same thing in attract mode and the CPU controlled
lamps will dim until the displays show the correct data again. The
displays do correct themselves which makes me think it's a lamp or
display PIA as there isn't any switch matrix activity in attract mode correct?

Any thoughts?
Thanks!
 
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