Path: utzoo!utgpu!water!watmath!clyde!rutgers!gatech!bbn!uwmcsd1!lakesys!rich
From: rich@lakesys.UUCP (Rich Dankert)
Newsgroups: comp.sys.atari.st
Subject: Re: Spectrum 512 and my machine...
Message-ID: <554@lakesys.UUCP>
Date: 27 Mar 88 22:32:26 GMT
References: <1072@sask.UUCP>
Reply-To: rich@lakesys.UUCP (Rich Dankert)
Organization: Lake Systems - Milwaukee, WI
Lines: 30

In article <1072@sask.UUCP> long@sask.UUCP (Warren Long) writes:
>
>I have discovered something very interesting about either my
>machine or about Spectrum 512 (demo).  When I first turn on my ST
>and display Spectrum images, it works perfectly.  After about 
>5 minutes, the images start to flicker (only certain pixels).  After
>more time (about 2 more minutes), more and more pixels have started
>to flicker, eventually ending up with the whole image being a
>flickering, indistinguishable mess.  It's a neat effect, but
>undesired.
>
>Why is this happening?? 

	You either have a MMU chip failing or the GLUE chip failing after 
the system has been on for a fw minutes. I have never seen it act like this
but then its not out of the realm of possiblitys.

	Best way to check this out (if its thermal) wuold be to get a can 
of freeze spray from your local Radio Shack and simply freeze one or the 
other, and see what happens. Most likely the MMU though. just don't get too
crazy with the spray..........

rich
UUCP: {Ihnp4,uwvax}!uwmcsd1!lakesys!rich


-- 
 Disclaimer: The words, expressions posted here are my own.....
 Nothing is ever so bad that it can't be made worse by trying to fix it 
						   -- Law of the Hacker