IBM Mainframe Discussion List <[email protected]> wrote on 03/24/2011 
09:42:22 AM:

> >You will want to ensure that your system can support V=R.
> 
> It's a joke, son. AFAIK there has never been V=R support above the
> line,

  That is correct.  V=R is supported only for private
area below 16MB, so 16MB is an upper bound (but not a 
least upper bound) on the size of a V=R region. 

> other than DAT-off code in the Nucleus, and even that I'm not
> sure about.

  The DAT-off nucleus is in contiguous real storage, but
it is not virtualized anywhere, and is accessible only 
via real addresses. 

Jim Mulder   z/OS System Test   IBM Corp.  Poughkeepsie,  NY

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