> For example, can z/OS 1.6 run on hardware without it?

Extended immediate instructions were introduced on Freeway (i.e., z800/z900) 
processors. Operating systems prior to 1.6 could run on 9672 processors. 1.6 
requires a Freeway processor. 1.6 went out of service 9/30/2007.


Bob Shannon
Rocket Software

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