That may be, but that is not what he said. He referred specifically to the "existence" of the Diagnose instruction.
The Diagnose instruction has been documented in every Principles of Operation manual issued for the S/360 architecture and for all subsequent superseding architectures, and in every case, has specifically stated that the functions performed by the Diagnose instruction are not published, but may impact any and all aspects of system operation, and if invoked by a user application built without access to that unpublished documentation, may negatively impact the proper functioning of the machine, requiring a Power On Reset and/or the assistance of a Hardware Support Engineer to bring the system back into proper working order. John P. Baker -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Ed Gould Sent: Thursday, December 27, 2007 10:54 PM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: It keeps getting uglier I could be wrong but I think he is talking about the "undocumented" "option codes" that a diagnose could *really* do. Ed ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
