PDP-11/10 repair started

How do you define '11/10S' ? 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. 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 better!] 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. -tony - Henk