[pups] 11/23 and other qbus machines

[pups] 11/23 and other qbus machines

[Tim Bradshaw]

I'm maybe going to acquire an 11/23.  It looks like this is kind of
small for running v7 and/or 2.11 as it has no split I/D (it does have
an MMU in it but only an 18-bit one I think).

How similar is the physical hardware (card cage I mean really) of this
to things like 11/73,11/83?  I'm wondering if I might one day be able
to acquire a card-set from something bigger and install it in the same
rack, my logic being that cards are a lot easier to get from far away
than racks, and this machine is only a few miles away.

Thanks

--tim

Received: (from major at localhost)
	by minnie.cs.adfa.edu.au (8.9.3/8.9.3) id VAA05724
	for pups-liszt; Sat, 1 Jul 2000 21:07:47 +1000 (EST)
	(envelope-from owner-pups at minnie.cs.adfa.edu.au)
Received: from henry.cs.adfa.edu.au (henry.cs.adfa.edu.au [131.236.21.158])
	by minnie.cs.adfa.edu.au (8.9.3/8.9.3) with ESMTP id VAA05720
	for <pups at minnie.cs.adfa.edu.au>; Sat, 1 Jul 2000 21:07:45 +1000 (EST)
	(envelope-from wkt at henry.cs.adfa.edu.au)
Received: (from wkt at localhost)
	by henry.cs.adfa.edu.au (8.9.2/8.9.3) id VAA61099
	for pups at minnie.cs.adfa.edu.au; Sat, 1 Jul 2000 21:06:49 +1000 (EST)
	(envelope-from wkt)
Received: from timaxp.trailing-edge.com (timaxp.trailing-edge.com [63.73.218.130])
	by minnie.cs.adfa.edu.au (8.9.3/8.9.3) with SMTP id VAA05698
	for <PUPS at MINNIE.CS.ADFA.OZ.AU>; Sat, 1 Jul 2000 21:01:38 +1000 (EST)
	(envelope-from SHOPPA at timaxp.trailing-edge.com)
Received: by timaxp.trailing-edge.com for PUPS at MINNIE.CS.ADFA.OZ.AU;
          Sat, 1 Jul 2000 7:00:37 -0400
Date: Sat, 1 Jul 2000 7:00:37 -0400
From: Tim Shoppa <SHOPPA@trailing-edge.com>
To: PUPS at MINNIE.CS.ADFA.OZ.AU
Message-Id: <000701070037.262009c5 at trailing-edge.com>
Subject: Re: [pups] 11/23 and other qbus machines
Sender: owner-pups at minnie.cs.adfa.edu.au
Precedence: bulk

>I'm maybe going to acquire an 11/23.  It looks like this is kind of
>small for running v7 and/or 2.11 as it has no split I/D (it does have
>an MMU in it but only an 18-bit one I think).

Yeah, perhaps the best choice here would be the set of RL02's I found with
a V6 system on RL02 packs.  Hook up a RLV11 or a RLV12, a couple of
RL02 drives, and you're in business.

>How similar is the physical hardware (card cage I mean really) of this
>to things like 11/73,11/83?  I'm wondering if I might one day be able
>to acquire a card-set from something bigger and install it in the same
>rack, my logic being that cards are a lot easier to get from far away
>than racks, and this machine is only a few miles away.

It's very similar, but it's also rather likely that the card cage that your
11/23 comes in will only support 18-bit bus addresses.  If you want
to run 2.11BSD that's not really enough memory.  For some
details about what Q-bus hardware supports 18-bit stuff and what 
Q-bus hardware supports 22-bit stuff, please look at your Micronotes,
specifically #5, _Q22 Compatible Options_.  If you aren't lucky enough
to own a set, you can browse them at

http://metalab.unc.edu/pub/academic/computer-science/history/pdp-11/micronotes/

In large part, it's impossible to specify a PDP-11 as a "PDP-11/23" and
know with any certainty what any single part of it is.  There's much
more to a system than the CPU (and note there are several very different
CPU boards sold as 11/23's), you also have to consider backplane, memory,
and disk/tape storage.  It'd be nice if Warren linked to some not-on-
Minnie resources for these subjects important to many PUPS members (hint hint,
nudge nudge!)

-- 
 Tim Shoppa                        Email: shoppa at trailing-edge.com
 Trailing Edge Technology          WWW:   http://www.trailing-edge.com/
 7328 Bradley Blvd		   Voice: 301-767-5917
 Bethesda, MD, USA 20817           Fax:   301-767-5927

Received: (from major at localhost)
	by minnie.cs.adfa.edu.au (8.9.3/8.9.3) id VAA05783
	for pups-liszt; Sat, 1 Jul 2000 21:13:56 +1000 (EST)
	(envelope-from owner-pups at minnie.cs.adfa.edu.au)
Received: from henry.cs.adfa.edu.au (henry.cs.adfa.edu.au [131.236.21.158])
	by minnie.cs.adfa.edu.au (8.9.3/8.9.3) with ESMTP id VAA05779
	for <pups at minnie.cs.adfa.edu.au>; Sat, 1 Jul 2000 21:13:54 +1000 (EST)
	(envelope-from wkt at henry.cs.adfa.edu.au)
Received: (from wkt at localhost)
	by henry.cs.adfa.edu.au (8.9.2/8.9.3) id VAA61171
	for pups at minnie.cs.adfa.edu.au; Sat, 1 Jul 2000 21:12:59 +1000 (EST)
	(envelope-from wkt)
Received: from henry.cs.adfa.edu.au (henry.cs.adfa.edu.au [131.236.21.158])
	by minnie.cs.adfa.edu.au (8.9.3/8.9.3) with ESMTP id VAA05769
	for <pups at minnie.cs.adfa.edu.au>; Sat, 1 Jul 2000 21:12:49 +1000 (EST)
	(envelope-from wkt at henry.cs.adfa.edu.au)
Received: (from wkt at localhost)
	by henry.cs.adfa.edu.au (8.9.2/8.9.3) id VAA61141;
	Sat, 1 Jul 2000 21:11:45 +1000 (EST)
	(envelope-from wkt)
From: Warren Toomey <wkt@cs.adfa.edu.au>
Message-Id: <200007011111.VAA61141 at henry.cs.adfa.edu.au>
Subject: [pups] Re: PDP-11 ptrs on minnie
In-Reply-To: <000701070037.262009c5 at trailing-edge.com> from Tim Shoppa at "Jul 1, 2000  7: 0:37 am"
To: SHOPPA at trailing-edge.com (Tim Shoppa)
Date: Sat, 1 Jul 2000 21:11:44 +1000 (EST)
Cc: pups at minnie.cs.adfa.edu.au (PDP-11 Unix Preservation Society)
Reply-To: wkt at cs.adfa.edu.au
X-Mailer: ELM [version 2.4ME+ PL43 (25)]
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: owner-pups at minnie.cs.adfa.edu.au
Precedence: bulk

In article by Tim Shoppa:
> It'd be nice if Warren linked to some not-on-
> Minnie resources for these subjects important to many PUPS members (hint hint,
> nudge nudge!)

Send me the URLs & tell me where on http://minnie.cs.adfa.edu.au/PUPS
you'd like to see them :-)

	Warren