Re: Battlezone RAM trouble

Would a buss buffer problem or address decode logic cause this ?

-- Curt

>Date: Sat, 29 Mar 2003 16:53:31 +0200 (EET)
>From: Steve C <stevec@unix.beige.org>
>To: <vectorlist@synthcom.com>
>Subject: VECTOR: Battlezone RAM trouble
>MIME-Version: 1.0
>
>Hello all.
>
>First, I would like to thank Roger Boots for helping me with a problem on
>my Asteroids Deluxe...
>
>It had a weird intensity problem that I posted to Vectorlist, and he
>nonchalantly suggested a bad
>transistor in the blanking circuit.. I replaced those, it works perfect.
>Thanks Roger!
>
>
>I have a Battlezone board that "plays blind" and flashes vectors every now
>and then. On test, it indicates bad RAM at A1. I replaced that 2114, but
>the problem is still there.
>
>The AUX board is known good, and everything else in the game (including
>monitor) is good. The interboard header pins have been reflowed.
>
>I've been looking at the schamatics, and it looks like F2 might be the
>next point of attack, but I was hoping for some guidance on this matter
>before I start desoldering.
>
>When ram tests still show a bad ram after its been replaced, what's
>*usually* the cause? Any common problems?
>
>Thanks!
>
>Steve
>
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Received on Sat Mar 29 16:32:24 2003