[HECnet] MMJ to DB9 serial adapter

[Brian Schenkenberger, VAXman-]

Johnny Billquist <bqt at softjar.se> writes:

On 2013-10-05 22:27, Dave McGuire wrote:
On 10/05/2013 11:45 AM, Johnny Billquist wrote:
I have two VaxStation 3100's that I bought some time back but didn't
have time to mess with until now.

Unlike my DEC 3000, the serial console is an MMJ port and not a DB9
serial port.

Does anyone have an excess or spare MMJ to DB9 adaptor, or know where
I can purchase an inexpensive one?

First of all, you are talking about a DE9, not a DB9 (surprising how
many don't know the correct name of that connector).

    I educate whomever I can, but I have all but given up on the general
technical public understanding this.

It is rather surprising that this lack of understanding continues...

Second, DEC often used a different pinout for a DE9 than IBM did, so you
might not be too happy with the adapter, depending on what you want in
the end.

    In this case, the DEC-machine-facing side is the MMJ.   (at least that
is my understanding)

Mine too. But he was asking for a MMJ to DE9 adapter as well. And I was 
pointing out that the (most) common adapter is not IBM PC compatible.

I don't believe that the most common MMJ adapters are NOT PeeCee compatible.
I have and I have come across manymnay more that are PeeCee compatible that
those that are not.   The original 9-pin pinout was abandoned pretty early on
in the MMJ adapter history.   See the OpenVMS FAQ for actual part number for
these adapters.

http://www.hoffmanlabs.org/vmsfaq/

-- 
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