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From: towson%amsaa@sri-unix.UUCP
Newsgroups: net.micro
Subject: Re:  IBM-PC Cost
Message-ID: <13970@sri-arpa.UUCP>
Date: Wed, 23-Nov-83 14:34:31 EST
Article-I.D.: sri-arpa.13970
Posted: Wed Nov 23 14:34:31 1983
Date-Received: Sun, 27-Nov-83 04:56:21 EST
Lines: 19

From:      David Towson (CSD) <towson@amsaa>

Right on!  I put together an IBM-PC with 256K memory, a pair of
360K drives, the color graphics adapter and a surplus 19" Conrac color
monitor for $3000 including DOS 2.0 and the Technical Reference Manual.
The only problem I had was that in addition to the R,G and B color signals
I also had to use the intensity signal from the color graphics adapter if I
wanted to have the full "sixteen colors" (actually two intensities of each
color).  The standard color monitor didn't have an intensity input, so I had
to make one using three resistive summing networks - simple, but effective.
I also needed a composite sync signal, which is generated on the color graphics
board, but is not brought out on the rear connector.  I brought it out on pin
7, which was unused.  It works fine, and I could not possibly have gotten
this much PC any other way.  I decided to go with a "real PC" because I
didn't want to make a career out of doing compatibility analyses on the various
PC clones.


Dave