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2. 1. 1.9 Start Key
Pressing the start key (Figure 2-3) takes the processor out
of its stopped state, turns off the stop light, and allows the
processor to continue. In the CE mode of operation the
start key is also used to start the processor clock and then
sequentially advance it.
2.1.1.10
Power Check Light
This light comes on when a machine power supply mal-
functions or when a thermal condition exists. This light
also comes on during a power up sequence and remains on
until the sequence is completed.
For additional information refer to section
5.8.
2.1.1.11
Thermal Light
The thermal light and the power check light (Figure
24)
come on when overheating occurs in the CPU mainframe.
Turning off the power On/Off switch turns off the power
check light. The thermal light remains on until the thermal
condition is removed. Then the normal power on sequence
can be performed.
2.1.1.12
Lamp Switch
This switch turns on all system lights so that you can check
for burned out lights.
2.1.2 CE Controls
2. 1.2.
1 Address/Data Switches
These four switches (Figure 2·4) set up addresses or data.
An
address {16 bits) is loaded into the storage address
register (SAR).
Page of SY31-0244-2
Revised December l, 1971
By TNL:
SN31-0307
Message Display Unit
Processor
Check
ON
~-.
Power
Off
Figure 2-3. System Controls
1/0
Attention
Program
Load
~
~
Data can now be entered into main storage-8 bits when
operating in test mode or 16 bits via a program.
Once a program level has been halted, the halt must be reset
before an instruction can be properly executed in a specific
program level. The halt can be reset by pressing the system
reset key or the start key. (On machines with the dual pro-
gram feature, press the halt reset key to reset the halt con·
dition.)
2.1.2.2 CE Key
Switch
This switch (Figure 2·5), when in the CE position, stops the
usage meter from recording processor time while the CE
services the equipment.
If this switch is turned off while the
CPU
is running, a pro·
cessor check can occur.
5410MM
2·3
E
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