>     I would like to pick up a value from the PSA for each active 
> processor.  The CVT points to the PCCAVT which has one pointer for 
> each processor.  The PCCA has a field PCCAPSAV.
> 
> (18)    ADDRESS          4    PCCAPSAV     - VIRTUAL ADDRESS OF
>                                                         PSA
> 
>     On my Dallas RDP system, this points to a field in extended SQA.
> However, the contents of this virtual PSA do not correlate at all to
> the contents of the actual PSA, using XDC to interrogate and 
> display.  However, in looking at an SVC dump from a day or so ago 
> for this same system, it appears the fields are valid.  I then 
> looked at an SVC dump from a customer, where there were 6 engines 
> active, and each virtual PSA looked valid.  So, SVC dump must know 
> how to do this.  If anyone knows how to accomplish this 
> programmatically, I would appreciate them sharing this with me.  Thanks.

 The P in PSA is for Prefix.  So a program needs to consider the 
effects of prefixing and reverse prefixing, as described in 
Principles of Operation.  SVC dump is a program which considers
those effects.
 
Jim Mulder   z/OS System Test   IBM Corp.  Poughkeepsie,  NY

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