DEC Lab 11/40

From: Pete Turnbull <>
Date: Sun Oct 21 19:05:13 2001

On Oct 21, 20:52, Tony Duell wrote:

> > On Thursday I took possession of a DEC Lab 11/40 system.
> Nice!. I've seen one once. AFAIK, it is (almost?) all standard DEC parts
> -- an 11/40 CPU, VT11 graphics display, LPS11 lab I/O, RK05 + RK11-D
> drives, etc.

Yes, I can't see anything in it that's not original DEC -- except a couple
of RK05 packs that turned up later, which are Scotch-branded rather than

> Well, DL11 cards are simple enough to repair. If it is the RS232 chips,
> they're just 1488s and 1489s, so no real problem to get replacements.

Agreed -- I have umpteen sets of them. And I've previously upgraded -YAs
to RS232, so no problem there either.

The machine usedf to be used with an LA120, but I had to leave that behind
as I simply have no room :-(

> Yes, VT11 board set. [...] I have prints if you are missing them.

I've found the manuals but not the print sets.

> It's the same ribbon cable (BC11) as is used for Unibus, but it certainly
> doesn't carry unibus singals here. It's a raw data interface to the

Yeah, I knew that, though I wan't clear in what I wrote. I just meant it's
the same type of cable -- so if it *is* damaged, it can be replaced
relatively easily.

> > and check the PSUs before I do anything else. I'm no Unibus or RK05
> > expert; most of my -11s are Q-bus. What else should I look for before
I go
> > too far?
> Read the printsets. Read them again. Then, as ever, check the power
> [...]

Thanks! That's exactly the detailed practical advice I was hoping for :-)

A quick look at the RK05s shows the foam ring on the blower is
disintegrating. I imagine this needs replaced with some similar
high-density foam before I put any packs in there. Any other places I need
to look?

I seem to have all the relevant maintenance manuals and engineering
drawings print sets, plus several extra photocopies and some updates.

I also have several copies of The Software Despatch for RT-11, and the
original Site Maintenance Manual for the machine, with the original
shipping notes, Field Service logs, etc.

Pete						Peter Turnbull
						Network Manager
						University of York
Received on Sun Oct 21 2001 - 19:05:13 BST

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