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

• CHECK CONTROL SWITCH
8
CHECK CONTROL
t~'i." AFTE~~TAV
DISABLE.
~
.HAAO STOF
• This switch controls the action taken by the CPU when
a machine check occurs.
• This switch, in any position other than process, causes
the TEST indicator on the lower console panel to light.
Customer Use
PROCESS
This position of the switch is used for normal program
processing when an operating system with automatic re-
cording of logout data is used.
STOP AFTER LOG
This position of the switch is used 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
program storage (locations 128 through 704) stops pro-
cessing and turns on the LOG PRES indicator. The diagnos·
tic logout can contain information about a machine check,
channel control check, or an interface check.
After a diagnostic logout, the operator runs the System
Environment Recording and Edit Program (SEREP).
18
Service Use
The remaining positions of the switch are used by service
personnel and are described in maintenance documentation.
'; NOTE
:
Programs using storage locations 128 through
704 are invalid after a diagnostic logout into
program storage. To continue processing, the
operator must re-IPL.