On Thu, 26 Jul 2007 13:16:25 -0700, John Robertson <pinball@telus.net> wrote:
>OK, now have another Tempest c/t in the shop, with the same !@#$!@#$
>twisting of the image between players and when the "TEMPEST" name
>comes up. I HAVE installed the H1 Eprom (.318) version that displays
>the copyright info, but the picture still twists the left side of the
>word "TEMPEST" once it is full size and in white.
>
>Heck, the game works fine, and I do not have enough hours to
>troubleshoot something the customer is not complaining about.
>
>Oh, the machine does have the rev 2 ROMs (2716s) installed and the
>checksums match the notes on this problem. The monitor does not have
>the input protection board either.
>
>John :-#(#
If your deflection board is a P324 (or P327?), or any board that has the diodes
806 through 808 installed, just lift one leg of each of those diodes (806-808)
and the problem will go away.
It was a really bad attempt at a protection circuit that adds a bit of
non-linearity to the input amplifiers.
-Zonn
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Received on Fri Jul 27 15:14:13 2007
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