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@mint Golly even at the time around 1985 there was a lot of argument about that. DOS was a simplified Xenix DOS 1.0 and I think 2.0 had the ability to either operate in DOS or Unix mode with a small config.sys tweak as I recall.

You could run several CP/M instances on an AT mchine simultaneously if you wanted.

usoft's unhappiness with Xenix drove a lot of the move toward the VMS direction, where there was apparently more cooperation.

Nobody can ever agree on this so it's ok. 🙂