Path: utzoo!attcan!uunet!cs.utexas.edu!wuarchive!julius.cs.uiuc.edu!apple!portal!cup.portal.com!schuster
From: schuster@cup.portal.com (Michael Alan Schuster)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: Memory chips in IBM AT
Message-ID: <34586@cup.portal.com>
Date: 6 Oct 90 13:35:05 GMT
References: <14626@hydra.gatech.EDU>
Organization: The Portal System (TM)
Lines: 14


>I want to be sure I am getting the correct chips for my 512k IBM AT board.
>It currently has 256k in the slots, with two banks empty.  The chips in this
>board are strange; two chips are soldered together, and inserted in each
>socket.  Are these 64k x 4 chips?

No, they are 128K chips that are produced by soldering two special-pinout
64K chips back-to-back. Some chip houses still carry these.

Be aware, though, that filling the motherboard will only get you 512K; you
want 640. If I were you, I'd get a cheap 16-bit memory expansion card,
and backfill ALL of the missing motherboard memory from that card, using
cheap modern RAM chips. If you shudder at losing a slot, get one of those
cards having serial/parallel I/O as well, so you'll be consolidating function.