USO (Unidentified System Unit)

Henk Gooijen henk.gooijen at
Fri Jan 15 13:52:32 CST 2016

-----Oorspronkelijk bericht----- 
From: Rod Smallwood
Sent: Monday, January 11, 2016 6:46 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: USO (Unidentified System Unit)

On 11/01/2016 17:33, Henk Gooijen wrote:
> I am pretty sure it is DEC made. Another manufacturer would surely  > have 
> sticked labeling from themselves on it ;-) Viewed from the rear side 
> (looking at the module handles), the right side panel has no id labeling. 
> The left side panel might have one, but that side is >
completely covered by a H??? power supply (forgot to write down the H >
number). I will check next Saturday. > > Thanks, - Henk > > >
-----Oorspronkelijk bericht----- From: Jay Jaeger Sent: Monday, >
January 11, 2016 6:25 PM To: cctalk at Subject: Re: USO >
(Unidentified System Unit) > > If it is DEC, and they haven't fallen
off, then on the side panels > on one side or the other of the rows
connectors there may be some > identification? > > JRJ > > On 1/10/2016
11:31 AM, Noel Chiappa wrote: >>> From: Henk Gooijen >> >>> I could not
find the M5950 nor M3020 in any module list. >> >> The M3020 (and M1131)
are variants of the M302 (and M113, >> respectively), so I don't think
those are much of a clue. The M5950 >> I couldn't find anything about at
all, but the M595 is a current >> mode converter for the DF11 - which I
can't find much about, >> although it's in the '73-'74 Peripheral
Handbook - but that looks >> distinctly like a possibility, from the
pictures there. >> >> Noel >>

DEC had a product line called  Components Group. You could buy almost
any DEC part and build what ever you wanted with it.

There was also CSS or Computer Special Systems. They did bespoke systems
and of course used standard parts where they could.


I know. I have a few CSS goodies and CSS documentation.
I will go to my "Hall of Famous Iron" tomorrow and try to have a better
look at that small rack-mounted backplane.

- Henk

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