(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(a)spektr.ludvika.se DECstation 5000/200 (NetBSD/pmax 1.3) http://spektr.ludvika.se/museum PDP11/83 (2.11BSD) VAX2000 (NetBSD/vax) Received: (from major@localhost) by minnie.cs.adfa.edu.au (8.9.1/8.9.1) id BAA28023 for pups-liszt; Fri, 25 Dec 1998 01:16:27 +1100 (EST) Received: from post.mail.demon.net (finch-post-10.mail.demon.net [194.217.242.38]) by minnie.cs.adfa.edu.au (8.9.1/8.9.1) with ESMTP id BAA28018 for &lt;pups(a)minnie.cs.adfa.oz.au&gt;; Fri, 25 Dec 1998 01:16:17 +1100 (EST) Received: from [158.152.152.109] (helo=falstaf.demon.co.uk) by post.mail.demon.net with smtp (Exim 2.10 #2) id 0ztBYh-0002Ra-00; Thu, 24 Dec 1998 14:16:11 +0000 Message-ID: &lt;sB9s7CAjtkg2EwEL(a)falstaf.demon.co.uk&gt; Date: Thu, 24 Dec 1998 14:10:43 +0000 To: Jorgen Pehrson &lt;jp(a)spektr.ludvika.se&gt; Cc: PDP11 UNIX Preservation Society &lt;pups(a)minnie.cs.adfa.oz.au&gt; From: Robin Birch &lt;robin(a)falstaf.demon.co.uk&gt; Subject: Re: PDP11/83 qbus layout. In-Reply-To: &lt;Pine.NEB.4.05.9812232234500.23424-100000(a)spektr.ludvika.se&gt; MIME-Version: 1.0 X-Mailer: Turnpike (32) Version 3.05 <YSkKJATYm0AxAbv6xUlJqScVOx> Sender: owner-pups(a)minnie.cs.adfa.edu.au Precedence: bulk In message &lt;Pine.NEB.4.05.9812232234500.23424-100000(a)spektr.ludvika.se&gt;, Jorgen Pehrson &lt;jp(a)spektr.ludvika.se&gt; writes Don't worry about that. A good plan There are rules about where boards can go which is an off shoot of the BG lines and so on. What you are calling the console board probably isn't, or if it is then you want to use the one from the CPU card rather than the M8020 (DPV11 I think?). What I suggest is this. Keep the CPU and the mem, the TK controller and tape, the deqna, the RQDX3 and a serial card (You never know when a spare serial port is going to be useful - printers, simple comms to a PC, spare terminal etc etc etc). A possible layout would be: |Dataram 40903 revG | Empty slot | (2mb ram) --------------------------------------------- | M8637-EH | (2mb ram) --------------------------------------------- | M8190-AE | (83 CPU) --------------------------------------------- | M7559 | M7504 | (TK70, DEQNA) --------------------------------------------- | M7957/M3104 | (DZV11) or (DHV11) --------------------------------------------- | M7555 | Empty slot | ---------------------------------------------- | Empty slot | Empty slot | --------------------------------------------- | Empty slot | Empty slot | --------------------------------------------- You would have to check with others which of the serial boards is best supported under 2.11BSD. Steve Schultz is your best point of contact for this. Looking at you aoriginal configuration I think that the empty slot by your M8020 is your problem (unless there is a bus grant card in there) as there wouldn't be any BG continuity. This should work and allow you to ditch all of the rest. (saving it for a rainy day of course :-)). Regards Robin ____________________________________________________________________ Robin Birch robin(a)falstaf.demon.co.uk M1ASU/2E0ARJ Old computers and radios always welcome