>As I read thru the MVS Extended Addressability Guide 
>I am trying to understand restrictions,

In general, you should assume that a z/OS service does not support AMODE 
64 unless it says it does.
In general, you should assume that a z/OS service that supports AMODE 64 
does not support data above 2G unless it says it does.

Peter Relson
z/OS Core Technology Design

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