[pups] Getting a MicroPDP-11 Running
Steven M. Schultz
sms at moe.2bsd.com
Tue Jul 25 13:18:29 AEST 2000
> From: Jeremy Bingham <jeremy at mail.flyingcroc.net>
> I just acquired a MicroPDP-11 from a Goodwill a couple of days ago with a
Wow - that's a source for PDP-11s I would never have thought of :)
> RX50-A dual 400KB floppy and an RD52 31/33(?)MB hard drive, but it doesn't
> have a tape drive. My questions are:
> 1.) What UNIXes have been successfully loaded onto these types of machines?
I think we need just one more little piece of information before we
can match up a version of Unix with your new machine.
We need to know if it's an 11/23 (23+), or an 11/53 (73). The
label "MicroPDP-11" was used on a number of systems. If it's a 53
or better then you can run any of the PDP-11 Unix systems that are
out there. If it's a 23 class machine then you're limited to V7
or earlier (2.9BSD would probably fit but it would be a struggle and
you definitely wouldn't be able to use the networking).
Looking at the system maint register with the console ODT would
probably be the easiest way to determine the cpu type - examine
location 177750 (or 17777750 depending if the system needs the
explicit 22 bit address). Bits 4 thru 7 tell the module type:
5 = KDJ-11E (93, 94), 4 = KDJ-11D (53), 3 = KXJ11-C, 2 = KDJ11B
(quad high 73), 1 = KDJ-11A (dual high board 73). If it's a 23 the
sys maint register probably doesn't exist.
Another way would be to look at the module number on the spine of the
> 2.) Can it be done without a tape? If so, has anybody pulled it off?
A ~32mb disk is going to be very tight for any 2BSD system. V7 will
fit I think.
> 3.) Are there any utilities, either DOS or UNIX/Linux/FreeBSD based, to write
> and/or format RX50 floppies?
Hmmm, I thought John Wilson has some utilities that could do that.
Normally you need to buy preformatted RX50 disks or have a DEC Rainbow
(DOS) system around.
On the other hand if the controller is an RQDX3 it is possible with
some luck (and more hardware skill than I have ;)) hook up a standard
5.25" Teac floppy drive. I don't have the location of the info for
that at hand - you might try the alt.sys.pdp11 or vmsnet.pdp-11
newsgroups (lots of knowing folks hang out there).
sms at moe.2bsd.com
Received: (from major at localhost)
by minnie.cs.adfa.edu.au (8.9.3/8.9.3) id OAA72804
for pups-liszt; Tue, 25 Jul 2000 14:19:41 +1000 (EST)
(envelope-from owner-pups at minnie.cs.adfa.edu.au)
More information about the TUHS