So would a person not be better off -- well, would not the MVS system "be
better off" -- have more options -- by specifying LOC=(31,64)? Why is it not
the default?

Charles
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On Behalf
Of Jim Mulder
Sent: Thursday, December 16, 2010 6:40 PM
To: IBM-MAIN@bama.ua.edu
Subject: Re: Why not STORAGE OBTAIN LOC=(31,64)?

> What are the reasons, if any, that one would NOT specify 64-bit backing
> storage on a STORAGE OBTAIN? Not specify LOC=(whatever,64)?
> 
> Are there any circumstances other than a program that explicitly dealt 
with
> real addresses that would make backing storage above the bar likely to 
be
> problematic?

  No, there are not. 
 
> I don't see a clear statement of what the default is if one specifies, 
for
> example, LOC=31. Is that equivalent to LOC=(31,31) or LOC=(31,64)?

  The book says:

LOC=31 and LOC=(31,31) indicate that virtual and central storage can be 
located anywhere below 2 gigabytes. 

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