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From: Jorgen Pehrson <jp@spektr.ludvika.se>
To: PDP11 UNIX Preservation Society <pups@minnie.cs.adfa.oz.au>
Subject: PDP11/83 qbus layout.
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(Sorry for the rather lenghty post)

Hi,
I'd just try to boot my newly aquired PDP11/83 and was planning to install
2.11BSD. But I've run into one (small?) problem. If I just try to boot
from DU0: it says: 

Trying DU0

Error 20 
Controller Error

And if I boot the install tape from the TK70 drive and run disklabel,
all accesses to the RD53 drive just times out. So I was going to remove
all unwanted QBus boards from the boxes. And that's what I was going to
ask...

Is there something special I have to think about, like there's some slots
that can't be used, some boards must be in a specific slot and so on?

This is the current layout (which is exactly as it was when it was taken
offline, or so I think)

11/83 (173QA-B3, I think this is a normal BA23 enclosure):
(As seen from the back) Also contains one TK70 drive.
    
 ____________________________________________
|Dataram 40903 revG     |        Empty slot  | (2mb ram)
---------------------------------------------
|                    M8637-EH                | (2mb ram)
---------------------------------------------
|                    M8190-AE                | (83 CPU)
---------------------------------------------
|     M7559             |         M7504      | (TK70, DEQNA)
---------------------------------------------
|     M8020             |        Empty slot  | (console?)
---------------------------------------------
|                    M7957                   | (DZV11)
---------------------------------------------
|                    m3104                   | (DHV11)
---------------------------------------------
|     M9404            |          Empty slot | (1st Qbus conn)
---------------------------------------------

Expansion box (173QA-B3)
(From the back) Also contains one RD53 and one dual floppy.

_____________________________________________
|M9405-YA               |        Empty slot  | (2nd qbus conn)
---------------------------------------------
|                     m3104                  | (DHV11)
---------------------------------------------
|     m9047             |        m9047       | (grant cont x2)
---------------------------------------------
|     m7555             |        Empty slot  | (RQDX3)
---------------------------------------------
|     m7512             |        Empty slot  | (RQDX1E)
---------------------------------------------

Plus one external disk box with two RD53 drive. (This system only uses one
drive though.)

Now, what I obviously want to keep is:
the two RAM boards, the CPU, the console board, tk70 controller, deqna,
rqdx3.

What I want to loose:
the rest of the serial boards, the rqdx1e board and the floppy drive.

What do I have to do to make this work? I would preferrably want to fit
all those boards in the main CPU enclosure box. Do I have to re-assign any
addresses (or vectors, or what the correct PDP-speak is). Are there any
slots in the enclosure that are a no-no for the dual-sized boards?

Thanks for any input!!


Jorgen Pehrson                  HP 9000/380 (NetBSD/hp300 1.3)
jp@spektr.ludvika.se            DECstation 5000/200 (NetBSD/pmax 1.3)
http://spektr.ludvika.se/museum PDP11/83 (2.11BSD) VAX2000 (NetBSD/vax)


