On Mon, 8 Mar 1999, Douglas S. Meade wrote:

=> One weakness remains.  I didn't have an MMJ6 serial connector, so
=> I looked around on the web, and found a distributor who seemed to
=> understand what I wanted when I talked with him.  From Stonewall
=> Cable, Inc, I bought what was called a "DECServer 90LT (MMJ)"
=> which is a short cable that connects the MMJ6 to 25 pin.  The
=> 25-pin connector has only 6 pins: 1,2,3,6,7 and 11.  (I'm not
=> sure yet *which* of the MMJ6 wires are connected to which pin.)
=> 
=> I've got that cable connected to a null modem cable that I've
=> been using successfully for other serial console setups.
=> 
=> Can someone tell me if this seems to be the right cable?  I'm still
=> getting no response from this computer from the Kermit dumb terminal,
=> although my Kermit setup works for the DECStation/25 and /240.  Are
=> there some specs available on the pinouts of the MMJ6

See http://csgrad.cs.vt.edu/~tjohnson/pinouts/ for MMJ details.  Here is
the relevant text from that page:

-----
Console on a DEC VAXstation 3100 or DECstation 3100:
Connector: mmj

                          Corresponding 25 pin RS-232 pins
1 DTR                                  20
2 TD (+)                                2
3 TD (-)                                7
4 RD (-)                                7
5 RD (+)                                3
6 DSR                                   6

This isn't RS-232, its a differential interface (hence the + and - pins) 
(RS-422?).
-----

There is also a link to a GIF of the MMJ connector on there, too.

Cheers,

Paul.

e-mail: paul@gromit.dlib.vt.edu

"I didn't mean to take up all your sweet time"
	--- James Marshall Hendrix