Source for MMJ cables.

Ian King IanK at vulcan.com
Tue Dec 9 21:55:42 CST 2008


Um, correction: I just remembered that the console connection on my PDP-11/73 is a D connector, so I'm using one of the various endpoint adapters.  But it IS true that when I'm connecting the VT420 to any of my VAXen, which all bear MMJ connectors, everything Just Works.  -- Ian
________________________________________
From: cctalk-bounces at classiccmp.org [cctalk-bounces at classiccmp.org] On Behalf Of Ian King [IanK at vulcan.com]
Sent: Tuesday, December 09, 2008 7:35 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: RE: Source for MMJ cables.

>From my reading of the relevant literature, the 'smarts' for direct vs. "null modem" connections is in the endpoint - if you were connecting a MMJ-equipped device to a D-connector-equipped device.  When I've connected a computer to a monitor (i.e. a VT420 to a PDP11/73, pretty similar to your setup), just plugging the MMJ cable into each one has always worked.  I'm not aware that there are crossed vs. non-crossed MMJ-tipped cables.  FWIW -- Ian
________________________________________
From: cctalk-bounces at classiccmp.org [cctalk-bounces at classiccmp.org] On Behalf Of Glen Slick [glen.slick at gmail.com]
Sent: Tuesday, December 09, 2008 5:30 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Source for MMJ cables.

On Tue, Dec 9, 2008 at 4:22 PM, Andrew Back <andy at smokebelch.org> wrote:
>
> Ah, so I have a BC16E-10. It's been a while but I assumed that since it was
> crossover and I was having no joy that I had the wrong cable. I should be
> clear, I'm trying to connect a VT420 to a PDP11/53. Tried both ports on the
> PDP and all manner of settings on the VT. I'm assuming that I can use the
> MMJ socket on the VT (the one not marked for a printer obviously) and that I
> don't need to use the 25W D and an MMJ convertor.
>

Just a minute ago I connected a KDJ11-SD / M7554-SD to a VT320 by
plugging one end of a BC16E cable into the A1 plug on the 11/53 and
the other end into the VT320.  Set the VT320 for 9600 baud and powered
on the 11/53 and got the boot ROM startup.  No messing around required
for this setup for me...

-Glen







More information about the cctalk mailing list