6 Jan
2009
6 Jan
'09
8:55 p.m.
From: toby at coreware.co.uk
To: cctalk at classiccmp.org
Date: Tue, 6 Jan 2009 20:19:27 +0000
Subject: PDP-11/05 returns to life
I managed to coax my PDP-11/05 back into life today and ran a few
simple programs on it successfully.
Well done!
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
hand but when powered one hums heavily and the other reluctantly and
somewhat noisily spins up (if kick started with a screwdriver). If
recovery is impossible can anyone suggest suitable replacements? The
current ones are labelled Super-Boxers
My 11/05 is not near me, so I can't check. But AFAIK, they are standard
110V fans, used in almost all UNIBUS PDP-11's. Exception is the 11/44
which used weird fans, I seem to remember 35V - 75 Hz (!)
2. Is there a chasing lights program I can run on the
11/05? Would be
nice to see it visibly doing something
Search the net. There is a small program (estimate 7 words). It uses
the RESET instruction (is that 000005?) ... not nice if you connect
an RX01 or RX02 to the machine as on every RESET (INIT) the heads clunk!
3. At the moment the machine has 16KW of core (2 x 8KW
planes). This
together with the CPU fills all but the last slot on the Unibus (its a
5inch box so only 9 slots). I'd like to fit a DL11 so that I have some
serial comms and ideally an RX11 as well so I can hook up my RX01 drives
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.
That depends on the backplane!
Check my website (www.pdp-11.nl) in the PDP-11/05 folder, the link is
called "backplanes".
Direct access: www.pdp-11.nl/pdp11-05/cpu/backplanes.html
4. What versions of RT-11 is suitable for an 11/05 and
what is the
minimum memory to run it?
My guess: any version, but XM will not fit (I think), so it's SJ or FB.
I will not go into legal issues ...
Thanks,
Toby
- Henk.