Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!att!cbnews!mvadh
From: mvadh@cbnews.att.com (andrew.d.hay)
Newsgroups: comp.sys.3b1
Subject: Re: Upgrading motherboard memory on 0.5meg 7300
Message-ID: <1991Feb19.120220.28152@cbnews.att.com>
Date: 19 Feb 91 12:02:20 GMT
References: <1991Feb19.033445.6107@ursaco.beartrack.com>
Distribution: na
Organization: AT&T Bell Laboratories
Lines: 25

In article <1991Feb19.033445.6107@ursaco.beartrack.com> cjp@ursaco.beartrack.com (cjp login) writes:
[]
"Then install a 74F258 chip in the spare near the jumpers described above.
"
"Remove all of the memory chips and replace with them 256K bit 150ns DRAMS.
"
"This sounds pretty easy if you have any experience with working on printed
"circuit boards.  Has anyone done it?  What problems should I look for?
"I expect to use sockets for the 256k chips and the 74F258.

here's a trick i have used with *phenominal* success:  after sucking
the solder from a hole, wiggle the leg of the chip WITH THE SOLDERING
IRON!  you will usually hear a click as the solder, wicked in between
the leg and the side of the hole, breaks loose under the combined heat
and force of the iron.  don't use too much pressure; let the iron do
its work.  after this, the chip will just about *fall* out, and the
hole will be unaffected.

i wouldn't bother with a socket for the 258.

-- 
Andrew Hay		+------------------------------------------------------+
Ragged Individualist	| 			JAAAAAAANE!		       |
AT&T-BL Ward Hill MA	|	    HOW DO YOU STOP THIS CRAZY THING?	       |
a.d.hay@att.com		+------------------------------------------------------+