From mboxrd@z Thu Jan  1 00:00:00 1970
From: jnc@mercury.lcs.mit.edu (Noel Chiappa)
Date: Sun,  5 Feb 2017 17:01:06 -0500 (EST)
Subject: [TUHS] PDP 11/34a Serial Communications Problem
Message-ID: <20170205220106.3443518C0C7@mercury.lcs.mit.edu>

    > From: Mark Hare <markhare at buffalo.edu>

    > I believe I have found the problem.

Excellent!

    > Looking at the DL11-W, I saw that there is an uncovered trace on the
    > circuit board just below the pins of the BERG connector.  It appears
    > that the exposed conductor ends of the cable were making contact with
    > this trace, which shorted the entire cable together.

Shorting any set of DL11-W pins together still shouldn't have caused that
symptom, AFAICS.

I'm too lazy to pull out a DL11-W, and prints thereof, to check, but I suspect
that what actually happened is that trace carries some 'interesting' signal,
and it got grounded 'or something' by the exposed ends of the flat cable.

    > I'm just glad that there doesn't appear to be any lasting damage.

Indeed! I was worried about that...

	 Noel