System Indicators - IBM System/370 145 Operating Procedures Manual

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SYSTEM INDICATORS
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SYS MAN WAIT TeST LOAD
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INDICATOR
FUNCTION
SYSTEM
The SYSTEM indicator is on when CPU operations are
in progress and either use meter is running.
The MANUAL indicator is on when the CPU clock is
MANUAL
stopped or the system is in a soft-stop state. All pending
interrupts are handled. Manual store/display operations
are possible only when the MANUAL indicator is on.
The WAIT indicator is on when the system is in a wait state
(CPU clock running but no instruction processing taking
WAIT
place). If an interrupt occurs, the CPU is taken out of wait
state and processing is started under control of the pro-
gram being executed.
The TEST indicator is on when any of the following
switches are not in the process or normal position.
TEST
1. RATE
2. CHECK CONTROL
3. DIAGNOSTIC/CONSOLE FI LE CONTROL
4. ADDRESS COMPARE CONTROL
The LOAD indicator is on when the Initial Program Load
LOAD
(JPL) is in progress. It turns on when the LOAD key is
pressed and turns off when the initial PSW is loaded success-
fully.
Console I ndlcators, Switches, and Keys 11