Which versions for 11/34 (Sep I+D space)
Steven M. Schultz
sms at wlv.iipo.gtegsc.com
Sat Nov 11 02:46:36 AEST 1995
Bob -
> From: rjm at swift.eng.ox.ac.uk (Bob Manners)
>
> It has been suggested to me that since the 11/34a MMU doesn't support
> separate instruction and data space, certain versions of UNIX are not
> suitable. Does anyone out there have any idea which versions of UNIX
> require separate I+D space?
The last version of UNIX for the PDP11 which stood a chance of
running on a non split machine was 2.9BSD. I'd expect it to be
a very tight fit though because even on a split I/D machine we
ended up overlaying the kernel (but then even V7 took overlays
to fit - which we hacked into the kernel, at least in the environment
here). A long long time ago I did squish a V7 system into an 11/23 -
not a pretty sight, each command you ran caused the others on the
system to be swapped out (do a "ls -l" and watch the shell get swapped,
when the 'ls' finished then the shell would be swapped back in, etc.)
V6 would be a better match for a non-split (248kb max) machine. By
the time V7 was out the 11/70 was being used as the development
platform and split I/D was becoming more and more necessary.
Steven Schultz
sms at wlv.iipo.gtegsc.com
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