IBM System/370

Tum off interval
timer. Press
stop button
Tum on interval
timer. Press
start button
f"re;s rcque.l
on console
Cancel
the
looping job
with a dump
Page 1-4
Record loop
and prooeed
1. Set rate switch to I NSN step.
2. Display and record last 4 bytes
of current PSW or instruction
counter.
3. Press start and stop key.
4. Repeat until you have instruction
stepped through the loop. If the
loop is large, you may capture
the small and large ends of the
loop by placing the rate switch in
process and pressing start and
stop until observation
of the PSW
or instruction counter shows the
desired range.
5. Set rate switch to process and
press start.