control to an internal routine for processing. External interruptions
format of the
is an optional statement label.
specifies the address in your program of the routine to be
given control when an external interruption occurs.
you no longer want to trap external
1. External interruptions (other than timer interruptions) normally
place your virtual machine in the debug environment.
virtual interruptions, except multiplexer, are disabled. If you
are using the
control, register 1 points to a save area in the format:
must return control to the address in register 14.
4. If you issue a
interruptions while the
interrupted while the other is running. If your exits depend on
data in static areas, results may be undesirable.