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7.1.0 OPERATOR CONTROL PANEL
CONTROLS
7.1.1 LOAD Key/Light
This key is pressed to start the initial program
loading, IMPL followed by IPL.
The LOAD light turns on when the switch is
pressed and remains on until the first 4096 bytes
of the microprogram are successfully loaded.
7.1.2 START Key/Light
This micro instruction controlled switch is
turned on at IPL time. It is turned off when:
1.
The STOP key is pressed.
2.
The MODE SELECTOR switch on the CE
control panel is in the SYS I NSN STEP
position.
3.
A main storage address compare stop
occurs.
When the STOP light is on, the microprogram
is looping and interrogating the START switch.
When the START switch is pressed, the START
light turns on and the STOP light turns off.
Processing of the system instructions then
continues.
7.1.3 POWER ON/OFF Switch
This switch initiates a power on or power off
sequence. As part of the power on sequence a
system reset is performed to initialize the system.
At the completion of the power on sequence
(approximately 35 seconds), the STOP light is
turned on.
The contents of the registers and storage are
destroyed when the power is turned off.
Operator Control Panel
I
START
I
o
o
KEYBD PROC
ROY
CHK
ON
~
POWER
OFF
o
TH
CHK
o
PWR
CHK
7-2
7.1.4 STOP Key/Light
When this microprogram instruction controlled
switch is pressed, the system is stopped at the
end of the current system instruction and the
STOP light is turned on. At the end of each
system instruction, the STOP switch is inter-
rogated by the microprogram and if the switch
is pressed, the microprogram loops in a stopped
state.
This light turns on when the power on sequence
is complete. It turns off when the LOAD key
is pressed.
The STOP light also turns on if the micropro-
gram is loaded and a main storage address com-
pare stop occurs or the MODE SELECTOR
switch is placed in the SYS INSN STEP position.
7.1.5 KEYBD RDY (Keyboard Ready)
Light
This light is on whenever the keyboard is ready
to operate.
7.1.6 PROC CHK (Processor Check)
Light
This light is turned on whenever an unrecoverable
error is detected by the processing unit. When-
ever this occurs, the only way to restart is by
initiating an IMPL by pressing the LOAD key.
7.1.7 PWR CHK (Power Check) Light
This light indicates that a check in the power
system occurred and that power is removed.
However, voltage necessary to display the
check condition is still on.
7.1.8 TH CH K (Thermal Check) Light
This indicator is turned on whenever the temper-
ature is too hot in the A-gate, power supplies,
or printer. Power is turned off in the system
wher a thermal check occurs. After the thermal
condition is cooled, system power can again
be brought up.
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