VAX 11/750 Config and Diagnostics, anyone?

Ethan Dicks ethan.dicks at
Thu Nov 15 16:45:00 CST 2007

On Thu, Nov 15, 2007 at 08:55:57PM +0000, Tony Duell wrote:
> > > M7485 (DZ11) in Unibus slot 21
> I haev no idesas what the connectors on a UDA50 are, but I am sure the 
> header on a DZ11 is a 50 pin thing.


> _Many_ years ago I wired my own 
> 'breakout cable' for one, to get 3 or 4 of the ports usable before I got 
> the right Cabkit.

We used to use lots of Nevada Western RJ11 serial adapters.  We ran a
standard 50-pin-to-CHAMP cable from each serial board, then a hand-wired
double-telco-50-pin swabber to our rack-mounted Nevada Western panels
which broke 25 pairs into eight RJ-11s.  Figuring out one is tedious;
making a dozen isn't so bad once you have the pattern.

> IIRC, on the DZ11 the connector is parallel to one of the short edges of 
> the PCB...

It is.  I think it was designed to be easy to route in equipment of the
11/34 era.


Ethan Dicks, A-333-S     Current South Pole Weather at 15-Nov-2007 at 22:40 Z
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Ethan.Dicks at  

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