Re: Battlezone - intermittent graphics glitch

I'd look at the counters/timers and other maybe logic in the vector
generator...

Not sure if a Dodgy Eprom Sockets in the VGROM would cause that...

I've got an Asteroids that slopes up like that too.. Not had a chance to
look at it !!

Regards, Colin

----- Original Message -----
From: "Total Impulse" <totalimpulse@comcast.net>
To: "vectorlist" <vectorlist@vectorlist.org>
Sent: Saturday, February 16, 2013 6:18 PM
Subject: VECTOR: Battlezone - intermittent graphics glitch

>
> I'm working on a Battlezone board set. It has an intermittent graphics
> glitch - lasts anywhere from a fraction of a second to a few seconds in
> duration at random intervals. When it goes "wonky", the vector endpoints
> in text spread apart and the lines of text angle upwards and become
> distorted.
>
> Photos here:
> https://picasaweb.google.com/108339843851140624101/BZIssue#
>
> Before I start digging into it, any suggestions on likely areas to check
> first?
>
> I've already replaced all the electrolytic caps, the adjustment pots, the
> header pins for the interboard cable, and any obviously poor condition
> sockets. No faults come up in self test mode.
>
> Thanks,
>
> Alan
>
> --
> Total Impulse - Just Having Fun!
> Alan Estenson, totalimpulse@comcast.net
>
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Received on Sat Feb 16 16:09:14 2013