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From: eli@cvl.UUCP
Newsgroups: net.micro.atari16
Subject: upgrading the 520ST
Message-ID: <1283@cvl.UUCP>
Date: Fri, 7-Mar-86 22:05:10 EST
Article-I.D.: cvl.1283
Posted: Fri Mar  7 22:05:10 1986
Date-Received: Sun, 9-Mar-86 00:32:01 EST
Organization: Center for Automation Research, Univ. of Md.
Lines: 24

I just picked up the new ROMs for the 520 and installed them in my upgraded
ST.  I upgraded to 1 megabyte back in November '85 and didn't put any
resistors in (at the time, they weren't mentioned in the upgrade instruc-
tions).  A while ago, someone posted a message saying that when they did
this, they fried their ST.  From looking at the schematics, I saw no reason
for this unless the upgrade was not properly wired.  So, I said what the
heck and turned the thing on.  It has been running for a few days now with
no problems.

I question the necessity of cutting traces in ones ST and installing the
resistors.  Admittedly, my knowledge of digital electronics is not that
extensive, but I can't see how any harm could result from not using the
resistors.  I would suggest upgrading ones ST without installing the
resistors.  Only after doing this and finding that the upgrade doesn't work
should you need to install the resistors.  In any event, I don't see how
any harm could result to your machine by not installing the resistors (but
I don't guarantee it won't).  Maybe Atari will comment on this?
-- 

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Eli Liang  ---
        University of Maryland Computer Vision Lab, (301) 454-4526
        ARPA: eli@cvl, eli@lemuria, eli@asgard, eli@mit-mc, eli@mit-prep
        CSNET: eli@cvl  UUCP: {seismo,allegra,brl-bmd}!umcp-cs!cvl!eli