I don't know of any SADMP PTFs that were not downward compatible within 
the 
same release of z/OS, and we would certainly try to avoid creating that
scenario.

Jim Mulder z/OS Diagnosis, Design, Development, Test  IBM Corp. 
Poughkeepsie NY

> In addition the SAD IPL volume should in principle be compatible 
> with the level of z/OS that might use it. Periodically changes are 
> made to SAD by a PTF whose ++HOLD instructs you to rebuild SAD. It 
> could conceivably happen that an older level of z/OS might have 
> trouble with a higher level SAD IPL volume, but I've never seen it. 



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