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From: robert@fear.UUCP (Robert Plamondon)
Newsgroups: net.micro.trs-80,net.micro.pc
Subject: A Cheap(er) Memory Upgrade for the Tandy 2000
Message-ID: <221@fear.UUCP>
Date: Thu, 18-Jul-85 12:58:37 EDT
Article-I.D.: fear.221
Posted: Thu Jul 18 12:58:37 1985
Date-Received: Sat, 20-Jul-85 14:49:25 EDT
Organization: Weitek Corp. Sunnyvale Ca.
Lines: 22
Xref: linus net.micro.trs-80:244 net.micro.pc:4325

The "External Memory Card" for the Tandy 2000 comes with 128k of
memory, and empty sockets for another 128k.  Radio Shack wants you to
buy the second 128k from them, so they use a gimmick:  when telling
you how to install the 128k board, they tell you to remove the jumper
from pins E and F.

The only reason they want the jumper missing is to DISABLE THE SECOND
128K BANK.  If you follow directions and remove the jumper, adding
another 128k won't work.  Put the jumper back, and everything works
fine.

(I've only tried this for the first expansion board.  The jumper
positions in the instructions with the board and the Technical
Reference Manual don't match, so I'm not sure what to do with the
next expansion board.  If I find out, I'll post it.)

Use 64k dynamic RAMs, 150 nanoseconds.  You need sixteen of them.  At
Fry's Electronics they cost $0.66 each, so the whole upgrade costs
$11.30 (including sales tax) -- compared to $149.95 from Radio Shack.
-- 
		-- Robert Plamondon
		   {turtlevax, resonex, cae780}!weitek!robert