I’m not quite sure why you’re asking me this. However, there are ones that
would break compatibility and ones where there is no pressing need to
change. Sometimes the same thing. :-)

One has to view virtual storage as an evolution/journey - and some
destinations aren’t worth the candle. The “journey” bit is why I mentioned
the various versions of Db2.

Likewise, z/OS Development has captured its virtual (and real) storage
hills as needed. Not all at once.

Sent from my iPad

> On 4 Apr 2019, at 20:41, Paul Edwards <mutazi...@gmail.com> wrote:
>
>> On Thu, 4 Apr 2019 19:32:01 +0000, Martin Packer
<martin_pac...@uk.ibm.com> wrote:
>>
>> They will be (running 64-bit). However, apart from Db2*, much of their
>> virtual storage components can't tolerate being above the bar.
>
> Which virtual storage components can't tolerate
> being above the bar, and why is that and what
> would need to change?
>
> Thanks. Paul.
>
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