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Restart
'Restart' mode is used to restart processing.
This mode
has no display, it is specified from the mode selection
display.
To specify 'restart':
1.
Type R into the 'mode selection' display next to the
word SELECTION.
2.
Press ENTER.
When 'restart' has been entered, the system takes control
of the screen.
If the machine is in the stopped state when
'restart' is entered, processing starts with the program
restart PSW (a fixed location in storage).
If the machine
is in the operating state, the exchange of PSWs occurs when
the current instruction has been executed and after all
interrupts for which the CPU is enabled have been handled.
A 'restart' is successful only when an Operating System is
used that takes advantage of the restart PSW or prepares a
restart PSW for the explicit purpose of restarting the
system at a meaningful point.
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4331 Processor Operators Guide
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