So in other words STNSM.  AREA,X'FC' before

And STNSM AREA,X'03'. After


Sent from my iPhone

On Sep 9, 2013, at 7:30 AM, Peter Relson <rel...@us.ibm.com> wrote:

>> Data area's says that serialization is disablement. 
>> Does  this mean you need to run disabled or lock 
>> the CPU associated with the PCCA in question?
> 
> Disablement to z/OS means that the PSW is not enabled either for external 
> or I/O interrupts. No more, no less.
> 
> There is no concept in z/OS of "locking a CPU".
> 
> Peter Relson
> z/OS Core Technology Design
> 
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