Re: Tempest Troubleshooting help please

I had something VERY similar results on my Asteroids. It turned out to be
one of the buffers of the control inputs.

----- Original Message -----
From: "Jim Visser" <jimvisser@kentisd.org>
To: <vectorlist@vectorlist.org>
Sent: Monday, September 04, 2006 3:50 PM
Subject: VECTOR: Tempest Troubleshooting help please

> I have two Tempests, one working and one nonworking. Symptoms of the
> nonworking pcb: When powered up, the "Press Start" screen is backwards
> and upside down. It never shows the "Tempest" logo attract screen. The
> start buttons blink, but won't start the game. When put into test mode,
> the test box is displayed correctly right side up. I can cycle through
> the test screens and they all are displayed correctly. When I flip it
> back to game mode, I get one horizontal green line. Power off and back
> on and I get the upside down backwards screen again.
> What I have done so far: I have installed new rom sockets. I have
> swapped the roms from the working Tempest into this nonworking board. I
> have swapped mathboxes. The symptoms follow this pcb if I install it in
> my working Tempest, and if I put the working pcb into this nonworking
> cabinet it works perfectly. Fuses have been removed and checked. All
> other socketed chips have been removed, cleaned, and reinstalled.
> Voltages are ok. Interconnect ribbon pins have been resoldered.
> Does anyone have any ideas what to try next?
> Thank you.
> jim
>
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Received on Mon Sep 4 14:12:14 2006