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From: stevel@dartvax.UUCP (Steve Ligett)
Newsgroups: comp.sys.ibm.pc
Subject: Re: RAM expansion in IBM portable
Message-ID: <5400@dartvax.UUCP>
Date: Mon, 8-Dec-86 15:49:59 EST
Article-I.D.: dartvax.5400
Posted: Mon Dec  8 15:49:59 1986
Date-Received: Tue, 9-Dec-86 05:04:04 EST
References: <840@ukecc.UUCP> <5384@dartvax.UUCP> <147@uhmanoa.UUCP>
Reply-To: stevel@dartvax.UUCP (Steve Ligett)
Distribution: net
Organization: Dartmouth College, Hanover, NH
Lines: 31

In article <147@uhmanoa.UUCP> sandy@uhmanoa.UUCP (Sandy Phipps) writes:
>In article <5384@dartvax.UUCP>, stevel@dartvax.UUCP (Steve Ligett) writes:
>> In article <840@ukecc.UUCP> sean@ukecc.UUCP (Sean Casey?) writes:
>> >
>> >I have an honest to goodness IBM portable with a rather
>> >paltry 256K in it.  I'd like to go to 512K by changing

>> The IBM Portable uses the same motherboard as the XT,
>
>That's right and the have been numerous replies suggesting hardware
>modification by soldering a jumper across various locations on the
>motherboard.  I have a much easier solution.  In fact it comes from
>a company in Texas.  
>	A company called INNOVENTIONS, Inc is Houston Texas sells a 
>kit for upgrading the XT motherboard to 640K.  This works fine in
>the Portable also.  The kit includes two chips, one to replace a 
>chips already on the board and the other is added to an empty socket.

(deleted stuff about the expensive products available)

Well, that sounds like an easy solution, though an expensive one.
Perhaps it's the documentation that costs so much.  The prom and
multiplexer chips don't cost near $60, and the rams shouldn't cost
$70 either.

Disclaimer - I do stuff like this to make money, but I don't think
that 1000% markup on a prom (or just 100% on rams) is good for the
business.
-- 
     Steve Ligett  stevel@dartmouth.edu  or
(astrovax cornell decvax harvard ihnp4 linus true)!dartvax!stevel