From owner-pups@minnie.cs.adfa.edu.au Thu Feb  4 07:40:01 1999
Received: (from major@localhost)
	by minnie.cs.adfa.edu.au (8.9.1/8.9.1) id HAA08676
	for pups-liszt; Thu, 4 Feb 1999 07:38:13 +1100 (EST)
Received: from mpl.ucsd.edu (chiton.ucsd.edu [192.135.238.128])
	by minnie.cs.adfa.edu.au (8.9.1/8.9.1) with ESMTP id HAA08671
	for <pups@minnie.cs.adfa.oz.au>; Thu, 4 Feb 1999 07:38:04 +1100 (EST)
Received: (from cdl@localhost)
	by mpl.ucsd.edu (8.8.8+Sun/8.8.8) id MAA03843;
	Wed, 3 Feb 1999 12:37:53 -0800 (PST)
Date: Wed, 3 Feb 1999 12:37:53 -0800 (PST)
From: Carl Lowenstein <cdl@mpl.ucsd.edu>
Message-Id: <199902032037.MAA03843@mpl.ucsd.edu>
To: bdc@world.std.com, pups@minnie.cs.adfa.oz.au
Subject: Re: MicroVAX I console port question.
Sender: owner-pups@minnie.cs.adfa.edu.au
Precedence: bulk

> From owner-pups@minnie.cs.adfa.edu.au Wed Feb  3 11:35 PST 1999
> Date: Wed, 3 Feb 1999 11:11:56 -0800 (PDT)
> From: Brian D Chase <bdc@world.std.com>
> To: PUPS Mailing List <pups@minnie.cs.adfa.oz.au>
> Subject: MicroVAX I console port question.
> Mime-Version: 1.0
> 
> Off-topic, but maybe somewhat related to MicroPDP-11's... I've got a
> MicroVAX I in a BA23 enclosure.  I'm presently a bit thrown by the serial
> console port.  I'm used to the 9pin MicroVAX II ports.  From what I've
> been told, the DB25-M connector for the console requires a special serial
> cable for connecting the MicroVAX I up to a terminal.  A null modem cable
> is not adequate. 

My MicroVax (I and only) handbook vintage 1984 says the cable is a "BC22D-10".

VAX Systems and Options Catalog Oct 1984 describes the BC22D-10 as
"A fully shielded null modem cable".  Two DB25F connectors, 6 wires.

The pins in use are 1,2,3,6,7,20.  I would expect that "null modem"
means (from one end to the other) connect 2-3, 3-2, 7-7, 6-20, 20-6.

The implication is that the computer might need to see DTR asserted
before it talks to the terminal.

    carl

        carl lowenstein         marine physical lab     u.c. san diego
        {decvax|ucbvax} !ucsd!mpl!cdl                 cdl@mpl.ucsd.edu
                                                  clowenstein@ucsd.edu


