On 28 April 2010 19:37, Martinez, Frank J <[email protected]> wrote: > MVT was not broken. Are you still running it?
Well, MVT *was* seriously broken in many ways. I remember the operators struggling to get the nightly jobs through, using all their wits to release the right work to arrange the regions so that the right number of things would fit in the available real storage. MVT had no system integrity or security at all. Password "security" was trivially bypassed, and any informed undergrad could get into supervisor state in a few lines of code. There was no fetch protection for all that real storage, so anyone could troll through storage looking for interesting strings. One day, one of those undergrads who we would today call a script kiddy, ran an IEHPROGM SCRATCH VTOC on all the packs whose names he could figure out. He was caught, but not by the system. Do you remember TCAM...? IEHMOVE...? TSO with swapping and a hard region size (real storage again) and no ability to run in batch...? CRJE...? HASP-II...? It is indeed fun to play with on an emulator in 2010, but to say it wasn't broken... Tony H. ---------------------------------------------------------------------- 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
