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From: rartym@cybavax.UUCP (Richard Artym)
Newsgroups: net.sources,net.wanted.sources,net.wanted,net.unix-wizards
Subject: UNIVS: Unix for J-11 or 11/84
Message-ID: <183@cybavax.UUCP>
Date: Wed, 26-Mar-86 15:53:38 EST
Article-I.D.: cybavax.183
Posted: Wed Mar 26 15:53:38 1986
Date-Received: Sat, 29-Mar-86 05:59:58 EST
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Organization: University College Swansea, Wales
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    Does there exist a Unix distribution for PDP's running the J-11 CPU chip?
Going by the `Differences' section in DEC's Architecture Handbook, the J-11
looks mainly like an 11/44, but with bits of 11/24, 34, 40 and 45 thrown in!

    We are installing a  J-11-based Nissho N1100 board as an upgrade to our
PDP-11/34A (yes, we're in the museum business); we can run the '34 system on
the new CPU without any changes whatsoever, but in this mode we can only
access an eighth of the on-board 2 Mbytes of memory (i.e. the maximum an 11/34
expects to see).  This is a minor upgrade in itself, since the J-11 is a bit
faster than the '34 on most things and, unlike our '34, has an FPU.  However,
we won't see any major improvement until we gain access to the other 7/8 of
that memory!  If you have a suitable distribution, or know of one, I would
be more than happy to hear from you!

    Incidentally, I believe that the "new" PDP-11/84 is based on the J-11, so
anything that runs on that will do us fine!  (Also, if there is sufficient
similarity between any of 11/23, 34, 40, 45, 60 or 70, and the J-11 or 11/84,
then I may be able to make do with just the new machine support file, conf/m.c,
and the sys/* files that need alteration, if any, since our V7 sources have
all those options built in.)

    If you have any queries, comments, answers or suggestions regarding this
or related topics, I'd appreciate this type of feedback too.  Thanks!

-- 
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> Rich Artym, Elec.Eng., Univ.College of Swansea, Swansea SA2 8PP, Wales, UK. <
>  UUCP : {UK}!ukc!reading!cybavax!rartym ; JANET : rartym@swxa/000060601800  <
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