At the very least, take the dumps and compare bit 38 of CR0.

El vie, 1 ago 2025 a las 18:09, Philippe Leite (<
[email protected]>) escribió:

> As I said to Rob, I already knew this POP rule for a long time, but it
> doesn't answer this situation I'm facing.
> It's exactly the same z/OS 3.1 version (same source and PTF level) but it's
> working differently on a z14 and z15.
>
> Philippe Leite
> z/OS System Programmer
>
> On Fri, Aug 1, 2025 at 1:04 PM salva <[email protected]> wrote:
>
> > From the POP:
> >
> > "Fetch-Protection-Override Control
> > Bit 38 of control register 0 is the fetch-protection-
> > override control. When the bit is one, key-controlled
> > fetch protection is ignored for locations at effective
> > addresses 0-2047."
> >
> > I don't know why it's different in your cases.
> >
> > El vie, 1 ago 2025 a las 16:40, Philippe Leite (<
> > [email protected]>) escribió:
> >
> > > Interestingly, I am experiencing the same situation here.
> > > In an LPAR running z/OS 3.1 on a z14, when I send the command “TSO
> ISRDDN
> > > B 800.”, I can view the contents of PSA 2048-4095.
> > > But when I am in another LPAR with the same z/OS 3.1 on a z15, the same
> > > command “TSO ISRDDN B 800.” shows me an error message “Storage
> > unavailable.”
> > >
> > >
> > > Philippe Leite
> > > z/OS System Programmer
> > >
> > > ----------------------------------------------------------------------
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> > > send email to [email protected] with the message: INFO IBM-MAIN
> > >
> >
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> >
>
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