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From: wtm@neoucom.UUCP (Bill Mayhew)
Newsgroups: comp.sys.ibm.pc
Subject: Re: ibm monitor compatibility with att pc6300+
Message-ID: <589@neoucom.UUCP>
Date: Tue, 19-May-87 09:01:56 EDT
Article-I.D.: neoucom.589
Posted: Tue May 19 09:01:56 1987
Date-Received: Sat, 23-May-87 07:14:22 EDT
References: <4Uaz1Ay00V4FyGs09p@andrew.cmu.edu> <2113@ihlpl.ATT.COM>
Organization: Northeastern Ohio Universities College of Medicine
Lines: 29
Summary: Taxan ATT 6300 cable lacks ground lead


Re: the previous article about AT&T 6300 monitor comaptibility.

I have the Xerox version of the AT&T 6300 at home.  I'm using a
Taxan 640 monitor with it.  The monitor performs quite well,
providing much better than average convergence and color saturation
than most competitiors.  It *is* compatible with AT&T's 640*400
graphics and hi-res character displays.

I only have one complaint.  Taxan goofed when they made the AT&T
cable; they left out the shield ground wire.  At first, I was
having terrible trouble with the monitor picking up RF
interferrence which would cause it to loose sync.  Peculiarly, the
RF problems were mainly associated with 640*400 graphics.  My
computer worked just fine with it's original monochrome monitor.
I cured the RF pick-up by soldering a #18 AWG wire to the outside
of the DB-25 connector that plugs into the 6300.  I wound the wire
in a loose spiral around the monitor cable and soldered the other
end of the new wire to the shell of the DIN plug on the monitor's
end of the cable.  The above completely cured the problem.  The
"IBM compatible" cable provided with the monitor does indeed have
the necessary ground wire.

Looping the DIN end of the monitor cable once though a large
ferrite doughnut would also probably reduce RF pickup, but I
couldn't find a big enough doughnut in my junk box to try that
option.

  --Bill  (wtm@neoucom.UUCP   ...!cbatt!neoucom!wtm)