[pups] 11/23 and other qbus machines
Tim Shoppa
SHOPPA at trailing-edge.com
Sat Jul 1 21:00:37 AEST 2000
>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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