DEC 40-pin to RS-232 serial adapter
Older DEC UNIBUS and Q-Bus serial devices have inconvenient 40-pin Berg connectors. Our new device adapts these 40-pin outputs to standard DE-9F RS-232 signals.
Even better, you can also set the serial port speed directly on the adapter! This device generates a clock signal that is fed back into the serial port to override the clock speed. (Note that you may need to configure your serial device to use the provided clock rather than an internally generated one.)
You can even choose between straight-through and null modem (swaps TX/RX) modes.
Our device is known-working with these interfaces:
PDP-8 KL8-E (M8650) and KL8-JA (M8655) console ports
PDP-11/05 and PDP-11/10 console ports
UNIBUS DL11 (M8043)
UNIBUS DL11-W (M7856)
Q-Bus DLV11 (M7940)
Q-Bus DLV11-E (M8017)
Q-Bus DLV11-F (M8028)
MMJ to 9-pin serial
To connect a machine bearing an MMJ socket to another machine bearing a standard DE-9M serial port, such as a modern USB-Serial adapter, order an MMJ-RJ45 cable with RJ45-to-DE-9F adapter.
No null modem required!
These 6' (182cm) cables are wired with an MMJ connector at one end and an RJ45 connector at the other. We supply an adapter to provide the same pinout as the original DEC H8571J:
Signal |
MMJ |
RJ45 |
DE9-F |
Signal |
|---|---|---|---|---|
– |
– |
8 |
– |
– |
|
1 |
7 |
1, 6, 8 |
|
|
2 |
6 |
2 |
|
|
3 |
5 |
5 |
|
|
4 |
4 |
5 |
|
|
5 |
3 |
3 |
|
|
6 |
2 |
4 |
|
– |
– |
1 |
– |
– |
If you prefer to wire the adapter yourself, leave a note in the shopping cart and we will ship you an unmodified RJ45-to-DE9 adapter. (You might call it a DB9. That's your perogative!)
MMJ Cable
Newer DEC computers and terminals use a custom modular connector (MMJ) instead of a 9- or 25-pin serial cable. These cables have been hard to find - until now.
For connecting a PDP-11, VAX, or Alpha to a terminal, printer, or serial console server, both bearing MMJ sockets, order a standard crossover cable.
These are wired identically to the original DEC BC16E 6' (182cm) cable, with MMJ connectors on both ends.