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From: lum@bat.cis.ohio-state.edu (Lum Johnson)
Newsgroups: comp.sys.next
Subject: Re: Op Environment vs Op System (was: NeXT not revolutionary enough?)
Message-ID: <28510@tut.cis.ohio-state.edu>
Date: 28 Nov 88 18:10:17 GMT
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In article <32711@bbn.COM> jr@bbn.com (John Robinson) writes:
>In article <27921@tut.cis.ohio-state.edu>, lum@bat (Lum Johnson) writes:
>>TENEX, modeled mostly on DEC TOPS-10, 
>
>I think this is a bit too strong.  TENEX kept parts of TOPS-10 it could use,
>and had a "compatibility mode" for running TOPS-10 programs, but a lot of the
>ideas were fundamentally different.  TENEX provided paged address space;
>PDP-10 was segmented [i.e., BBN added a pager to the PDP-10 to get to TENEX].

I did not mean to imply that any actual TOPS-10 code was borrowed for TENEX.
I was under the impression that it was a case mainly of reverse-engineering.
TOPS-10 was the cleanest and tightest implementation of Project MAC's ideas,
so it was used as the original reference model in developing TENEX.

>>... implemented on a Honeywell machine, ported to Digital's pdp-10 ...
>
>huh?  TENEX started out on and stayed with the PDP-10.  ...  Maybe you are
>confused with the Arpanet IMP, which started on Honeywell 516 minis, then
>went to H-316s, before jumping to a microcoded BBN-built machine in the early
>1980's.

Oh!  (How do I draw a red face in ASCII?)  This could well be.

I was thinking of the Honeywell 6000 series, also 36-bit machines, if my
memory has not failed me entirely.  Undoubtedly that and the IMP history,
taken together with apparently mis-recalled edit history comments, caused
me to confuse myself.  Whoops.  Thanks for the reboot.  :-)
-=-
-- 
Lum Johnson    lum@osu-20.ircc.ohio-state.edu    lum@tut.cis.ohio-state.edu
"You got it kid -- the large print giveth and the small print taketh away."
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