Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!uwm.edu!wuarchive!texbell!sugar!ssd
From: ssd@sugar.hackercorp.com (Scott Denham)
Newsgroups: comp.os.misc
Subject: Re: TSO and CMS
Summary: Evolution
Message-ID: <4296@sugar.hackercorp.com>
Date: 6 Oct 89 17:40:00 GMT
References: <1721@naucse.UUCP> <15122@netnews.upenn.edu>
Organization: Sugar Land Unix - Houston
Lines: 19

In article <15122@netnews.upenn.edu>, ferris@eniac.seas.upenn.edu (Richard  Ferris) writes:
> 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? ...
Basicly what happens is that IBM comes out with some new hardware
feature and then release a new variant of the OS to support it. Almost
inevitably, the new version costs more than the previous one did, so 
those with hardware that doesn't need the new support don't need or want
to spend the money to upgrade. In many case, (E.G. MVS/370 => MVS/XA),
you CAN'T go to the new OS without the new hardware. 
>             ... I find
> the abbreviations quite confusing and difficult to piece together.

Don't feel bad... I've been working with this stuff for 17 years and I
STILL get confused by it all!! :-)
 
   Scott Denham 
    Western Atlas International
     Houston, TX