Thanks for the explanation. That's one of the things I like about this list, where you can learn about things you never knew existed.
Peter -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] Sent: Monday, September 26, 2005 8:04 PM To: [email protected] Subject: Re: Some questions about cross memory services > What is "ESR-style vectored linkage"? ESR just stands for Extended Service Router. It originated as a way to map multiple SVC functions into a single SVC number. SVC 109 is an example. There is no deep magic involved. Your PC maintains a table, potentially a table of tables of tables... etc. Your caller indicates which specific function is needed via a parameter. The PC looks up the desired function and calls it - typically while handling entry/exit management, interface-level recovery etc. In other words, your single (hardware defined) PC routine serves as a router to an arbitrarily large number of functions. And if you manage it carefully you can even make the set of functions dynamically manageable without having to mess with the entry table. CC ---------------------------------------------------------------------- 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 _ This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. ---------------------------------------------------------------------- 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
