Re: DEC/MMJ connectors

From: GreyCloud (cumulus_at_mist.com)
Date: 04/30/05 

Date: Sat, 30 Apr 2005 10:10:58 -0600

Dave Froble wrote:
>
> GreyCloud wrote:
> > Does anyone know where I can get a 6-pin DEC/MMJ to female
> > db25 cable??
> > I managed to acquire an unused VT420 terminal.
>
> I'm thinking that you may be mistaken on what you need. The VLC, if my
> memory is any good, takes an MMJ. VT-420s also accept up to 2 MMJs.
> This allows for two sessions on the terminal. This capability can also
> be provided by some (most) of the DECserver terminal servers.
>
> Unless I'm mistaken, you need a flat 6-conductor cable with an MMJ on
> each end. The MMJs are reversed, ie; one end with the tab up, and the
> tab down at the other end. This flips xmit/recv, gnd/gnd, and DTR/DSR.
>
> I think there may have been an international model of the VT-420 with a
> DB25 connection.
>
> It's been a long time.
>
> If you need the MMJ cable, and cannot get it elsewhere, let me know.
> I've got all kinds of cables laying around. The connectors and tools also.
>

I looked at the back of the VT420 again, and you are quite
correct. All I need is about a 3 foot cable with MMJ on
each end like you say. I doubt that radio shack or any
other outlet would have this kind of cable around. I'll pay
you for a cable and I'll get in touch with you.

Relevant Pages

  • Re: How to recover an OpenVMS login?
    ... The pinouts of the MMJ and of various other connectors common to ... OpenVMS systems are included in the OpenVMS Frequently Asked ... Questions (FAQ), which is directly accessable at various sites, ... there are part numbers of various DECconnect cables and adapters, ...
    (comp.sys.dec)
  • Re: Is there any such thing as an MMJ (DEC423) gender changer or coupler?
    ... > Are you proposing that Nathan should cut his existing MMJ ... > normal RJ45 connector and socket, and stick on an MMJ at the ... Just cut the cable and crimp an RJ45 ... cables, one conveniently placed for a wallplate connector, the other a ...
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  • Re: HSG80 Serial connection
    ... regular 6-pin RJ12 connector rather than the "usual" DEC MMJ style. ... HSG80 has the same pinout as an MMJ jack. ... cables, you could just snip off the MMJ plug and crimp an RJ12 in its ... Unofficial OpenVMS Hobbyist Support Page: ...
    (comp.os.vms)
  • Re: DECServer wiring
    ... which end I will need cable that go from MMJ to DB9. ... use MMJ-MMJ cables and DB9 adapters? ... I do not see you connecting up the two signal grounds on the MMJ to ...
    (comp.os.vms)
  • Re: DEC/MMJ connectors
    ... you need a flat 6-conductor cable with an MMJ on ... one end with the tab up, and the ... DB25 connection. ... I've got all kinds of cables laying around. ...
    (comp.os.vms)