On Fri, Feb 26, 2016 at 10:37 PM, Tom Marchant <[email protected]> wrote: <deleted> > In addition, when an instruction references a storage > location whose upper bits match the prefix register, those bits are replaced > with 0. > This last function of prefixing was not implemented on System/360 or the > earliest > system/370 models. > <deleted> > -- > Tom Marchant About 1985-1989, I remember our mainframe taking a lot of crashes from jumps to low address space on a 2 processor pre-XA machine. Was some of this caused by this function?
-- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
