PDP-11/10 repair started

Henk Gooijen henk.gooijen at hotmail.com
Sun Oct 4 16:04:01 CDT 2015

-----Oorspronkelijk bericht----- 
From: tony duell
Sent: Sunday, October 04, 2015 10:44 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: RE: PDP-11/10 repair started

> Yes, it is an 11/10S.

How do you define '11/10S' ?

> AFAIK, the M7260 and M7261 is used in all 11/10 versions, and
> of course all 11/05 versions.  I could be wrong though ...

The 11/05 and 11/10 are, by now, the same machine ;-). What I mean
by that is that essentially the difference was what you got with it when
you ordered it, and of course today you are not going to find the machine
exactly as DEC would have shipped it.

> I guess you are confused with the M7265/M7266 (11/34) and
> M8265/M8266 (11/34A).

There are at least 2 versions of the 11/10 CPU boards. The later one, which
I thought was the 11/10S, has soldered wire links to disable the arbiter
(the 'S' meaning it can be a _S_lave processor on another machine's
Unibus). I think another link disables the built-in console port. And didn't 
use a crystal rather than RC clock for the built-in serial console port?

[The sooner I get my bookshelves made so I can find all my printsets the

You're right, I was getting confused over the M numbers. The original and 
boards seem to have the same numbers. The circuitry is very similar, but the 
references I have given might be wrong.


I define 11/10"S" by the backplane. There are 4 different backplanes
for the 11/10 and 11/05, according to the doc. I have them on my website,
I did not know that there were different versions of the CPU boards,
except the Rev.E and Rev.F of the M7261.  Good to know!
Seeing whether there is an XTAL for the console comms line is easy to
spot, but IIRC it is RC on my M7260.

- Henk 

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