[hercules-os380] z/Arch vs ESA/390

[[e-mail] [hercules-os380]]

I believe I read that the latest z/Arch systems
are no longer able to run OS/390.

I am wondering whether that means that
PDOS/390 will not run either.

I'm also wondering whether I can just
flip an extra bit on in the PSW and have
a z/PDOS running AM64, without needing
to change any other PDOS code.

Can someone enlighten me?

Thanks. Paul.

[Mike Schwab [e-mail] [hercules-os380]]

Correct. The z14 will not run 31 bit code. z/VM 6.4 will run 31 bit
code on a z14.

Post by ***@yahoo.com.au [hercules-os380]
I believe I read that the latest z/Arch systems
are no longer able to run OS/390.
I am wondering whether that means that
PDOS/390 will not run either.
I'm also wondering whether I can just
flip an extra bit on in the PSW and have
a z/PDOS running AM64, without needing
to change any other PDOS code.
Can someone enlighten me?
Thanks. Paul.
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[Bernd Oppolzer [e-mail] [hercules-os380]]

??

We have a z14, running z/OS 2.1, IIRC,
and it is running 31-bit code all the time;

our compilers (C and PL/1) produce 31-bit code only, at the moment.

Kind regards

Bernd

Post by Mike Schwab ***@gmail.com [hercules-os380]
Correct. The z14 will not run 31 bit code. z/VM 6.4 will run 31 bit
code on a z14.

[Mike Schwab [e-mail] [hercules-os380]]

Sorry. z14 will only IPL a 64 bit OS, with longer PSWs and registers
for interrupts, etc. Within the 64 bit OS, it will run 24 and 31 bit
applications, since there is very little 64 bit user applications or
even 64 bit system routines.

On Thu, Mar 22, 2018 at 8:49 PM, Bernd Oppolzer

Post by Bernd Oppolzer ***@yahoo.com [hercules-os380]
??
We have a z14, running z/OS 2.1, IIRC,
and it is running 31-bit code all the time;
our compilers (C and PL/1) produce 31-bit code only, at the moment.
Kind regards
Bernd

Post by Mike Schwab ***@gmail.com [hercules-os380]
Correct. The z14 will not run 31 bit code. z/VM 6.4 will run 31 bit
code on a z14.

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Yahoo Groups Links

[Amrith [e-mail] [hercules-os380]]

Bernd have your tried using z14 pervasive encryption. Have new opcodes introduced for that?
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On Fri, 3/23/18, Bernd Oppolzer ***@yahoo.com [hercules-os380] <hercules-***@yahoogroups.com> wrote:

Subject: Re: [hercules-os380] z/Arch vs ESA/390
To: hercules-***@yahoogroups.com
Date: Friday, March 23, 2018, 1:49 AM


 









??



We have a z14, running z/OS 2.1, IIRC,

and it is running 31-bit code all the time;



our compilers (C and PL/1) produce 31-bit code only, at the
moment.



Kind regards



Bernd



Am 22.03.2018 um 22:58 schrieb Mike Schwab

Post by Mike Schwab ***@gmail.com [hercules-os380]
Correct. The z14 will not run 31 bit code. z/VM 6.4

will run 31 bit

Post by Mike Schwab ***@gmail.com [hercules-os380]
code on a z14.

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[[e-mail] [hercules-os380]]

Post by ***@yahoo.com.au [hercules-os380]
I'm also wondering whether I can just
flip an extra bit on in the PSW and have
a z/PDOS running AM64, without needing
to change any other PDOS code.

Ok, I remembered some more information.
z/Arch PSW bit 12 says whether the PSW
is an 8-byte or 16-byte PSW. And if I leave
that bit set to 1 (signifying 8-byte), I can't
then flip on the AM64 bit.

So I would need to modify the z/Arch
hardware if I wanted to run in AM64.
Or else I would need to use 16-byte
PSWs. So it's not simple.

Also, I later realized that PDOS/390
switches DAT on and has XA-style DAT.
That would also need to change in order
to be considered a z/Arch OS.

BFN. Paul.