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
DEC.
> 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
drives.
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