Yes quite interesting. I had forgotten all the particulars, and there in the list you pointed to was an an answer I gave to the subject...

Meanwhile, Google is sometimes my enemy. With the Linux system I am running, certain links will not function correctly, particularly when they point directly to a .pdf (thank you Adobe for abandoning Linux).

And most of the hits I got were just that, so that I couldn't get to them.

However, in searching Bit savers, I could not find a Field Engineers Ref.

But that article link to that particular archived thread answered my questions.

Thank you muchly for that -- things you don't use you tend to completely forget.

Regards,
Steve Thompson

On 07/07/2016 09:08 AM, Vernooij, CP (ITOPT1) - KLM wrote:
Google will answer anything. I found a tablet hat does not have a description 
for MVS, but for CMS (DOS ON) it says: LIOCS DIAG.
Another article https://www.mail-archive.com/ibm-main@bama.ua.edu/msg92290.html 
calls it the NOP SVC in S/360.

Intersting stuff.
Kees.


-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf 
Of Steve Thompson
Sent: 07 July, 2016 14:54
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Looking for an answer to an SVC question

I am looking for an old Field Engineers Handbook entry on SVCs.

SVC 50 used to be documented there (and as I recall, it doesn't
say much, but what it does say is important).

I'd like to know what is found in one of those books. I don't
have, available to me now, anything prior to z/OS 1.1. And I
think it was also documented in the MVS/XA Diagnosis Ref. (or
what ever it was called in those days), but the current books
just say reserved.

Regards,
Steve Thompson

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