z/OS DFSMS Macro Instructions for Data Sets
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Central storage addresses

z/OS DFSMS Macro Instructions for Data Sets
SC23-6852-02

Storage for all data areas and control blocks can be backed above the 2 GB bar even if your program is running in 24-bit mode. This means that you can code either of the following:
  • LOC=(BELOW,ANY)
  • LOC=(BELOW,64)
on the GETMAIN or STORAGE macro.

Recommendation: Code the second value as 64.

Note: Code LOC=(BELOW,ANY) or LOC=(BELOW,24) when using tape devices that do not support 64-bit IDAWs.

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