Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!ncar!tank!eecae!netnews.upenn.edu!eniac.seas.upenn.edu!ferris
From: ferris@eniac.seas.upenn.edu (Richard  Ferris)
Newsgroups: comp.os.misc
Subject: TSO and CMS
Summary: Summary of replies
Message-ID: <15122@netnews.upenn.edu>
Date: 4 Oct 89 22:19:48 GMT
References: <1721@naucse.UUCP>
Sender: news@netnews.upenn.edu
Reply-To: ferris@eniac.seas.upenn.edu.UUCP (Richard  Ferris)
Organization: University of Pennsylvania
Lines: 37

I appreciate all the responses I got regarding my
confusion about TSO, CMS, VM, and MVS and how
they work.  The bottom line can be summarized in this
useful chart:

(Thanks to J.D.McCown)
 
Tools:   Xedit/rexx/ISPF    TSO/SPF        TSO/SPF
OS:      CMS+CP(VM)         MVS            MVS
Machine: VM(Virtual)        VM(Virtual)    Real(hardware)

Basically TSO and CMS run on top of other systems.  TSO runs
on top of MVS while CMS runs on top of VM.  Since MVS can
run on top of VM, it is possible to run TSO on top of MVS on top 
of VM (middle column).  This is all quite simplified but it
conveys the basic idea.

There seem to be a bunch of different versions of MVS and VM.
I am still a bit confused:  How did all these different versions
evolve?  Are they basically expanded versions of the older 
systems (like DOS => OS/2) or are they designed to work on 
different hardware?  Also, where can I find a simple reference
that explains the history of these different systems?  I find
the abbreviations quite confusing and difficult to piece together.

Thanks again for all the help.

RF






Richard T. Ferris
ferris@eniac.seas.upenn.edu
University of Pennsylvania