6 Jan
2009
6 Jan
'09
10:27 p.m.
On 06/01/2009 21:09, Tony Duell wrote:
I agree with Tony, if they spin by hand, you don't have much of a
bearing/lubrication problem. If they do need lubrication, hot grease is
the stuff to soak the bearings in.
On 06/01/2009 20:19, Tobias Russell wrote:
I managed to
coax my PDP-11/05 back into life today and ran a few simple
programs on it successfully.
As a result a few questions for the experts out there:
1. To get it up and running I had to replace its two fans both of which
had failed which I did by scavenging another 11/05 chassis I have.
Does anyone have any tips on reviving failed fans? Both spin freely by
Hmmm... Normally they suffer from bad bearings, although I don't think
this is the problem with yours. This sounds, alas, like winding problems. I've
never tried to rewind one....
> recovery is impossible can anyone suggest suitable replacements? The
> current ones are labelled Super-Boxers
I'm 99.99% certain they're 110V AC fans -- that's what almost all PDP-11
and PDP-8 fans are. Not always easy to get over here, but they do exist
(Farnell list a couple but not the right size, I think). In fact, I
think I may have one spare if you get stuck.
> 2. Is there a chasing lights program I can run on
the 11/05? Would be
> nice to see it visibly doing something
You have a console serial port built into the CPU
board set. AFAIK it's
current loop only (which is a bit of a pain), it's wired to the 40 pin
Berg header on the back of the cabinet.
Yes, I think it's basically a KL11 equivalent. DEC used to make a thing
called a DLV11-KB, which is a 20mA-to-RS232 converter in small black box
about 70mm wide x 130mm long by 22mm thick, on a flange about 115mm
wide. It has a 10-way Berg on one end and the usual AMP 8-way flat
Mate-N-Lok on the other; it's actually meant to adapt a DLV11 (RS232
only) to current loop but AFAIK it'll work the other way round, so to
speak. Of course it's fairly simple to roll your own.
The on-board SLU in the KD11-B can be disabled by installing a jumper at
W1. W1 is on the M7261 board (control logic and microprogram board)
between E69 and C51 (about halfway up the board, roughly in line with
edge connector DH1/DH2). That was sometimes done in order to install a
DL11-W (SLU + LTC clock) or some other SLU that did have EIA/RS232
capability.
> and boot RT-11. Can I make use of the 9th slot or
does this have a
> special purpose? There is a lot of wire wrap going to slot 9 so I'm
> guessing its not suitable.
Dunno about the 9th slot but you should be able to run RT-11 V4 no
problem in 16KW, and most versions of V5 (though not the XM monitor, and
the FB might be too big to be useful).
I should have the 11/05 print set and some manuals somewhere. Maybe I
need to dig it out of storage.
--
Pete Peter Turnbull
Network Manager
University of York