V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

VOS
       Virtual machine Operating System (OS, MTS)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

VOS
       Virtual Operating System (OS, Stratus)


The Free On-line Dictionary of Computing (30 December 2018):

VOS

    An operating system used in Stratus
   computers.

   See also FTX.

   [Details?]

   (1998-07-06)