MMJ Cabling between VAX4000/300 and VT420

Peter Coghlan cctalk at
Mon May 11 04:41:07 CDT 2015

> I have to make a console cable for the VAX4000/300 and an VT420 Terminal.
> How are the pins to be connected? One to One or with an rollover
> (1-6,2-5,4-3)?

As far as I understand it, pretty much all MMJ sockets are wired the same
and the crossover between transmit and receive normally happens in the cable
so you need the rollover.

Even if this is not true in 100% of cases, it does appear to be true at least
in the case of connecting terminals to hosts.

Peter Coghlan.

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