On Wed, 1 Sep 2021 13:25:03 -0400, Jim Mulder wrote: > ... > As to the Astonishment in POLA, I would >suggest that astonishment is relative to the >experience of the beholder, ... > The oldest memories are the sharpest. I remember vividly my astonishment as an MVS/370 novice when I discovered that RER programs were not protected against modifying themselves despite ready availability of hardware facilities. (Then I could grasp the PoOps; no longer.)
I was even further astonished to learn that a program need to be Authorized in order to not modify itself. I imagine a program incorrectly marked REFR which depends on self-modification. It works for years until by happenstance it is refreshed and fails. Of course: "User Error. WAD." --gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
