Xenix version, ahem, based on System ahem...?

[Peter da Silva]

There seems to be total chaos on the naming front in the Xenix world. We're
running Xenix 3.5, which is an old Xenix based on SIII or V7 (depending on
who you talk to). Meanwhile the SV-based Xenixes seem to have names like
Xenix 2.2.1.

What's the naming history of Xenix, and what are the different versions
based on?
-- 
Peter da Silva, Xenix Support, Ferranti International Controls Corporation.
Work: uunet.uu.net!ficc!peter, peter at ficc.uu.net, +1 713 274 5180.   `-_-'
Home: bigtex!texbell!sugar!peter, peter at sugar.uu.net.                 'U`
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