In a recent note, Graeme Gibson said: > Date: Fri, 5 Aug 2005 16:50:35 +1000 > > ISTR that the 1401 had a LAR too. Anyone else recall this? > Hmmm. An architecture with a LAR would have no need for a BALR-type instruction; the called routine could simply save the LAR.
Hmmm. The LAR would need to be preserved through interrupts. > At 05:41 AM 8/5/2005, Pat O'Keefe wrote: > ><someone else wrote>... > > >z9 109 remembers the last successful branch instruction address and the > > >operating system displays that address in dumps. ... > > > >I'm surprised it has taken IBM this long. They had this built into the > >37xx hardware thirty years ago. The Lagging Address Register would -- gil -- StorageTek INFORMATION made POWERFUL ---------------------------------------------------------------------- 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
