External Interruptions An external interruption causes control to be passed to the external
interrupt handlerDMSITE. If the user has issued the HNDEXT macro to
trap external interrupts,DMSITE passes contrel to the user's exit
routine. If the interrupt was caused by the timer, resets the
timer and types theBLIP character at the terminal. The standard BLIP tiaer setting is two seconds, and the standard BLIP character is
uppercase, followed by the lowercase (it moves the typeball without
printing). Otherwise, control is passed to theDEBUG routine.
Machine CheckInterruptions Hard machine check interruptions on the real processor are not reflected
to aCMS virtual user by CP. A message prints en the console indicating
the failure. The user is then disabled and mustIPL again in order
to continue.
2-10IBM VM/370 System Logic and Program Determination--Volume 2
interrupt handler
trap external interrupts,
routine. If the interrupt was caused by the timer,
timer and types the
uppercase, followed by the lowercase (it moves the typeball without
printing). Otherwise, control is passed to the
Machine Check
to a
the failure. The user is then disabled and must
to continue.
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