The simple answer is to access data in other address spaces than the one in which your code is currently running. There are other more complex reasons as well, but that's the simplest.
The Principles of Operations manual is quite clear about the use of access registers. If you start there you may find more enlightenment. If this is for an course, I also suggest you also use the course reference material for your answer. HTH Peter -----Original Message----- From: IBM Mainframe Assembler List [mailto:[email protected]] On Behalf Of Sudershan Ravi Sent: Sunday, December 3, 2017 11:44 PM To: [email protected] Subject: Access registers Hi, Why do we use access registers? -- 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.
