IBM Mainframe Discussion List <[email protected]> wrote on 06/25/2008 
10:05:06 AM:

> E503   SVC Assist
> E504   Obtain Local Lock
> E505   Release Local Lock
> E506   Obtain CMS Lock
> E507   Release CMS Lock
> 
> These instructions comprised a part of the MVS Extended Facility, which
> provided performance improvements back in the days of MVS/XA and MVS/SP.
> 
> John P. Baker
> 
> -----Original Message-----
> From: IBM Mainframe Assembler List 
[mailto:[EMAIL PROTECTED]
> On Behalf Of Bielskie, Stephen
> Sent: Wednesday, June 25, 2008 9:54 AM
> To: [EMAIL PROTECTED]
> Subject: Op codes removed from z/10
> 
> Does anyone know what these opcodes are?  They are no longer supported
> on the z/10, but I can't find them in the Reference Summary
>         E503
>         E504
>         E505
>         E506
>         E507 

  MVS use of the SVC assist was removed in MVS/ESA SP3.1.0
  MVS use of the lock assists was removed in OS/390 2.10.

Jim Mulder   z/OS System Test   IBM Corp.  Poughkeepsie,  NY

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