On Sun, 12 Aug 2012, Kevin Reynolds wrote:
As someone who has done this recently, I have a few
suggestions, but you
have to buy some stuff.
Isn't that how it always is though? :)
First and foremost, I didn't have a crimper that
would work with mmj.
You can use just a standard rj11/rj12/rj21 crimper if you are willing to
break of the clip, but I didn't want that.
I bought this crimper. Its expensive, but cheap
crimpers make a
That's a Paladin Tools 8000 series crimp frame with a 2067 (MMJ/DEC) die
I own a bunch of the 8000 series crimp frames myself (so many of them in
fact that I have no idea how many I actually own now). As far as
interchangeable die crimp tools go, I think these are probably the best
out there. It will also accept dies from a number of different
manufacturers including Ideal and Greenlee.
Another really nice tool is the GMP modular plug presser. These use a
single die instead of the more common two-part die sets. The tool itself
is one of the more expensive ones, but they can be had for cheap if you
watch the surplus market. It does carry a lifetime warranty though.
Those prices are pretty good. At the time I bought 6P6C to DE-9 adapters,
rewirable MMJ to DE-9 adapters were expensive and had become very hard to
H8571-J female DB9 RS232 to MMJ adapter
For most of us at this moment the most important MMJ adapter is the
adapter to connect a normal PC to a DEC MMJ cable. The original part
number for this adapter is H8571-J. This adapter has a female DB9
connector on one side, and a female MMJ socket on the other. The wiring
is explained in the diagram. H8571J adapter, PC RS232 serial port to MMJ
'DE-9', not 'DB-9'...
The H8571-J adapter shown here can for example be used
to connect a DEC
printer with serial MMJ cable to a normal PC RS232 port. Note the
connection between pin 1, 6 and 8 in the RS232 connector at the PC side.
This connects the printer DTR line through the cross cable BC16E to the
PC's DSR, CTS and CD inputs. Some programs need these connections to
prevent paper-out and printer off line messages.
Here are what the genuine DEC H8571-J adapters look like:
DEC H8571-J rev A
(dot) ignorelist (dot) com/~tothwolf/classiccmp/H8571-J_rev_A.jpg
DEC H8571-J rev B
(dot) ignorelist (dot) com/~tothwolf/classiccmp/H8571-J_rev_B.jpg
(dot) ignorelist (dot) com/~tothwolf/classiccmp/H8571-J_rev_B_bags.jpg
Anyone care to guess how many adapters are in the bin? [If you are one of
the handful of people who already know, don't give it away.]
Those NOS H8571-J rev B adapters are actually available FS/FT [absolutely
no resellers!], but they aren't cheap (I used to sell them for $30 in my
eBay store). I literally spent a small fortune on them to keep them away
from the gold scrappers...
For the MicroVAX II end of the cable, for a MMJ cable you would want a DEC
(dot) ignorelist (dot) com/~tothwolf/classiccmp/H8571-B.jpg
(dot) ignorelist (dot) com/~tothwolf/classiccmp/H8571-B_naked.jpg
[That 'naked' H8571-B was already sans it's outer plastic shell when I
obtained it mixed in with some other random DEC parts. There isn't much to
those adapters, just a DE-9S and a MMJ jack.]
MicroVAX to PC serial cable:
(dot) ignorelist (dot)
(dot) ignorelist (dot)
This cable is wired per the diagram that can be found at Chuck's House of
originally posted here on classiccmp. I made this as a one-off cable long
before I was ever able to obtain proper H8571-B and H8571-J MMJ adapters.
It worked great, but less than 6 months later I got my hands on my first
H8571-B and then maybe a year or so later my first H8571-J.