Generally, that would give you an 0C1.  In my case it was a simple LOAD 
instruction.   L    R1,X'B4C'(0,0)

Chris Blaicher
Technical Architect
Syncsort, Inc.


-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf 
Of Lizette Koehler
Sent: Wednesday, August 19, 2020 4:16 PM
To: [email protected]
Subject: Re: Strange S0C4 on z15

[ External - This message originated Externally.  Use proper judgement and 
caution with attachments, links, or responses. ]

So I had an S0C4 one time - turned out the vendor had used an instruction that 
was not on the CEC (firmware) we were running.

So maybe there is an instruction used on the z13 that the 15 does not have?


Lizette


-----Original Message-----
From: IBM Mainframe Discussion List <[email protected]> On Behalf Of 
Christopher Y. Blaicher
Sent: Wednesday, August 19, 2020 12:12 PM
To: [email protected]
Subject: Strange S0C4 on z15

We have a program that ran fine on a z13 that now gets an S0C4 on a z15.
On a z13 we could access data in the PSA in the 2048 to 4095 range without 
going into key 0.  The specific field is PSASVT.
To get to that data now, we have to do a MODESET to key zero.
Anyone else find this as a problem?  Was it there with a z14?  We jumped from a 
z13 to a z15.

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