Oregon Software Pascal/2 (24 bit words)

sethm at loomcom.com sethm at loomcom.com
Mon Oct 16 13:06:22 CDT 2006

On Fri, Oct 13, 2006 at 03:42:30PM -0700, Tom Watson wrote:
> Yes, 24 bit machines did exist.  In fact before BSD, there was project Genie
> which made an SDS 930 into an SDS 940 (added paging hardware) and made up a
> timesharing system.  It was the basis of the Tymshare corporation which was
> formed in the 60's.  The machine had (IIRC) 64k of 24 bit words, paged in
> chunks of 4k words.  The technique used what they called "relabeling registers"
> on the upper 8 bits of the memory address.  The software had all sorts of
> things, including 'forks'.  All before Unix (1969).  Quite a system for its
> day.  It was the competition to the GE 235 (Later 635) machines that started at
> Dartmouth.  In the early 70's they had a whole bunch of machines in Cupertino
> under one roof.
> As for strings:  They packed 3 to a word (usually).
> Trivia:  'BRS 131B' was the system call to crash the system.

It's funny, I was just thinking about the SDS 940 this week.  SIMH has
an emulator for the 940, but so far I have uncovered no software to run
on it.

Has anyone ever found any GENIE tapes or backups?


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