PDP-11/10 repair started

tony duell ard at p850ug1.demon.co.uk
Sun Oct 4 15:44:49 CDT 2015

> 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 wronge 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 it
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 later
boards seem to have the same numbers. The circuitry is very similar, but the IC
references I have given might be wrong. 


- Henk

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