* [pups] 11/23 and other qbus machines
@ 2000-06-29 16:17 Tim Bradshaw
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From: Tim Bradshaw @ 2000-06-29 16:17 UTC (permalink / raw)
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
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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
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>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
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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)
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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
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2000-06-29 16:17 [pups] 11/23 and other qbus machines Tim Bradshaw
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