On Fri, 6 Mar 2009 07:43:26 -0600, Don Williams <donb...@gmail.com> wrote:

>IBM has already implied that the TOD register is intended to be a programming
>interface by stating in the POP manual:
>
>“13. Uniqueness of TOD-clock values can be extended to apply to processors
>in separate configurations by including a configuration identification in
the TOD
>programmable field.”
>
>IBM should state (in z/OS documentation) that z/OS guarantees a unique
>value in each register of a sysplex (as suggested in the POP manual),
>however, the particular value is not a programming interface, only that the
>value will be unique within a sysplex.

There are many hardware architectural features described in the PoP that
z/OS does not consider programming interfaces for programs running on z/OS.
 Finding and documenting all of them appropriately as "not a programming
interface" would require a lot of work, I think.

-- 
  Walt

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