Check Control Switch - IBM System/370 145 Operating Procedures Manual

CHECK CONTROL SWITCH
• This switch controls the action taken by the CPU when
a machine check occurs .
• This switch, in any position other than PROCESS, turns on
the TEST indicator.
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CHECK CONTROL
Operator Use
PROCESS
This position is for normal program processing when an
operating system with automatic recording of logout
data is used.
STOP AFTE R LOG
This position is for normal program processing when an
operating system without automatic recording of logout data
is used.
With the switch in this position, a diagnostic logout into
main storage (locations 128 through 704) stops processing
and turns on the LOG PRES and RETRY indicators. The
diagnostic logout can contain information about a machine
check, channel control check, or an interface control check.
After a diagnostic logout, you may run the System Error
Record Editing Program(SEREP).
Note: Programs using storage locations 128 through 704 are
invalid after a diagnostic logout into main storage. To con-
tinue processing,You must re-IPL.
Service Use
The switch positions not defined are for service personnel
and are described in maintenance documentation.