Walt,

There seems to be some belief here that 2G thru 4G-1 is unavailable for some
reason other than that specifically addressed by the undocumented
USE2GTO32G={NO|YES} operand.

I do not believe that to be case.  Am I correct?

John P. Baker

-----Original Message-----
From: IBM Mainframe Assembler List [mailto:[email protected]]
On Behalf Of Walt Farrell
Sent: Thursday, December 09, 2010 1:24 PM
To: [email protected]
Subject: Re: z/OS IARV64

As far as I know, yes. New functions in z/OS R12 required reserving some
space for system functions, and the VSM designers chose that previously
unreserved 256GB chunk of storage addresses for that purpose.

--
Walt Farrell
IBM STSM, z/OS Security Design

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