glen herrmannsfeldt wrote: >In the olden days, the interval timer at address 80 could >be updated with an MVC instruction. The new value was >stored at 84, and and 8 byte MVC move from 80 to 76 would >update the timer and return the previous value without >losing any counts. > >MVCL would not necessarily prevent the loss of counts.
I would suggest to consult the Principles of Operation, which has a whole section (more than 10 pages) on exactly that topic: 5.13 Sequence of Storage References and in particular 5.13.9 Storage Operand Consistency Mit freundlichen Gruessen / Best Regards Ulrich Weigand -- Dr. Ulrich Weigand Linux for S/390 Design & Development IBM Deutschland Entwicklung GmbH, Schoenaicher Str. 220, 71032 Boeblingen Phone: +49-7031/16-3727 --- Email: [EMAIL PROTECTED]
