Toggle Switches - IBM System/370 145 Operating Procedures Manual

TOGGLE SWITCHES
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Lamp Test
All console indicators should light when the LAMP TEST
toggle switch is operated to the TEST position. The switch
can be operated at any time without affecting system oper-
ation.
Interval Timer
NORMAL
Th is position enables the timer for use as described in the
IBM System/370 Principles of Operation, GA22-7000.
DISABLE
This position disables the interval timer. The content of
the timer is not available to the data flow for timer func-
tions. Time location 80 (hexadecimal 50) in main storage
is available for other program use.
Time of Day Clock
ENABLE SET
The switch must be in the ENAB LE SET position for the
set clock instruction to perform its function.
SECURE
Executing the set clock instruction with the switch in the
SECURE position does not affect the clock value.
14
Address Compare Control
This switch is used with the ADDRESS COMPARE and the
STORAGE SELECT rotary switches and determines the
action taken by the CPU as a result of an address compare
match.
SYNC/NORM
This position of the switch is the normal operating position;
it provides a sync pulse for service use and does not result
in a stop on an address match.
STOP
The STOP position is for customer use and provides a soft-
stop whenever an address match is detected. To restart the
CPU, press the START key. With the switch in this posi-
tion, the TEST indicator is on.
IMMED STOP
This position is for service use and is described in the
maintenance documentation. With the switch in this posi-
tion, the TEST indicator is on.
Console File Register Display
These switches are used by service personnel and are
described in maintenance documentation.