Path: utzoo!attcan!uunet!aplcen!haven!wam!dmb
From: dmb@wam.umd.edu (David M. Baggett)
Newsgroups: comp.sys.atari.st
Subject: Re: My ST crashes
Summary: Maybe it's too hot
Message-ID: <1990Sep15.174132.23192@wam.umd.edu>
Date: 15 Sep 90 17:41:32 GMT
References: <1958@ac.dal.ca> <2700@loria.crin.fr>
Sender: usenet@wam.umd.edu (USENET Posting)
Reply-To: dmb%wam.umd.edu@uunet.uu.net (David M. Baggett)
Organization: University of Maryland at College Park
Lines: 21

In article <2700@loria.crin.fr> domen@crin.fr (Eric Domenjoud) writes:
>Everytime I have been using my ST for  a couple of  hours, it crashes.
>It seems that the bit 6 of odd  addresses is turned  to 1. just before
>the crash, black  vertical lines appear on   the screen.  It  is  then
>impossible to reboot as long as the computer is warm.
>
>My computer is a 520ST with 1M RAM. 

Sounds a lot like a problem I've been having:  the RAM upgrade board
sits directly on top of the 68000, thereby preventing adequate
ventilation.  After a few hours of use I get all sorts of bizzare
behavior (including the vertical lines phenonemon).  I'm sure it's a
heat problem because the 68000 is hot enough to burn my hand when the
problems begin.  Turning a fan directly on the 68000 "fixes" things.
The MMU gets toasty too, which might explain your "bit 6" problem.  Try
running your ST with the top of the case off; the extra ventilation
should alleviate problems like these.  If that doesn't help, it's
probably something else.

Dave Baggett
dmb%wam.umd.edu@uunet.uu.net