This may not be multi-user, but I know the when I was a computer operator back 
in 1969, DOS on a 360 mod 40 could be run with 3 partitions - BG, F1, and F2.  
We didn't run any online systems, but you could run up to 3 jobs at a time. 

--
Eric Bielefeld
Systems Programmer


---- Paul Gilmartin <[email protected]> wrote: 
> I don't believe OS/360 was initially conceived as a multi-user
> system.  In consequence, it had no concept of ownership of
> resources.  This is coming to its progeny ex post facto, slowly,
> incompletely.
> 
> -- gil

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