On Mon, 7 May 2018 09:00:37 -0500, Paul Edwards <[email protected]> wrote:

>I just want z/OS to match MVS/380,
>and there is nothing technically preventing
>that from happening.

Nothing, except all the z/OS changes that you haven't considered, and all the 
application changes they might imply for existing applications that really 
don't care about 32-bit capability.

One problem was mentioned earlier in this thread: ELSQA, EPVT, ECSA, ELPA, and 
ENUC will prevent you getting the 3GiB that you want, because they're sitting 
in the way today. So, in addition to the "simple" changes you want, z/OS would 
also have to change its storage layout. I can't predict what parts of the 
system that would affect and how complex it would be, or what applications it 
might affect.

I'm sure there are more.

-- 
Walt

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