Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!usc!samsung!think!ames!sun-barr!newstop!sun!imagen!atari!kbad
From: kbad@atari.UUCP (Ken Badertscher)
Newsgroups: comp.sys.atari.st
Subject: Re: Mega chips & drive questions
Message-ID: <1833@atari.UUCP>
Date: 29 Nov 89 15:52:17 GMT
References: <21653@brunix.UUCP> <24548@cup.portal.com>
Organization: Atari Corp., Sunnyvale, CA
Lines: 24

Xorg@cup.portal.com (Peter Ted Szymonik) writes:

| Spectre GCR was unuseable.  When I had the 4 meg upgrade done they aslo
| replaced the two LS 373 chips with AS373 chips.  Since then the machine has
| been 100% without a bus error to be seen and Spectre GCR is 100%.

The hardware guys at Atari are looking into this problem.  It looks like it
may be a bus loading problem caused by the GCR.  I wonder, has anyone noticed
this problem occurring _without_ a cartridge plugged in?  The Atari hardware
guys I've talked to say that the cart port is on the hairy edge - basically,
if you hang anything but ROM's out there, you're asking for trouble.  It was
_designed_ this way, the intent of the cart port is to provide ROM space,
nothing else.

One other thing, there were some Mega 2's which were produced that are NOT
upgradable to 4 megs because of the parts used in manufacture.  I don't know
the details, but just thought I'd let people know, in case you're thinking
of dropping an extra 2 megs of RAM in, it may not be that easy.  Atari
dealers should be able to get the scoop on this from the dealer support folks
at Atari.
-- 
   |||   Ken Badertscher  (ames!atari!kbad)
   |||   Atari R&D System Software Engine
  / | \  #include <disclaimer>