[HECnet] MMJ to DB9 serial adapter

[Brian Schenkenberger, VAXman-]

Dave McGuire <mcguire at neurotica.com> writes:

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).

Fallout from DB-25 is likely to blame.



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

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.

THe early DEC 9-pin connectors were basically DB-25(pins 1 through 8) mapped
to DE-9(pins 1 through 8) and DB-25(pin 20) to DE-9(pin 9).   Due to the more
ubiquitous IBM PeeCee pin pin configuration, DEC bagan producings DE-9s with
that pin configuration.

The 9-pin console connection on the back of a MicroVAX-II, for example, hused
the earlier configuration.   The 9-pin console connection on the PCI bus Alpha
workstations, a later DEC product example, used the latter pin configuraiton. 

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

I tired hooking up my multisync monitor I have hooked up to my DEC
3000, but I don't think the graphic card is set to a setting within
the monitor's range, as nothing shows up.

Do the DEC 3000 have a VGA port?

It does not.

And there were different graphics options too for the 3000s depending upon
the model.   None, that I recall, were VGA.

-- 
VAXman- A Bored Certified VMS Kernel Mode Hacker       VAXman(at)TMESIS(dot)ORG

Well I speak to machines with the voice of humanity.