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Stop: The selector channel and CPU stop upon de-
tection of a channel control check, interface control
check, or any CPU check condition.
Channel Stop: The selector channel stops on de-
tection of any channel check condition except IU,
I
program check, storage protect check, or chan-
nel data check. CPU check conditions also freeze
channel operations.
Jn this mode, interface responses (out tags) are
delayed until 'in tag delay 3
1
time so that a check
condition detected by interface tests can stop the
channel response on the interface. This mode should
not be used with diagnostic programs that force
check conditions.
Metering
Two time-recording meters and a key-operated switch
are located on panel section M. One meter records
customer usage time; the other records maintenance
time. The key-operated switch selects which meter
is to record the running time. The selected meter
accumulates time when:
1. The manual light is off and there is no wait
bit in the PSW.
2. A metering-in signal is received from any
1/0 device.
3. Any system control panel pushbutton switch
is pressed.
Section N - Operator Controls
This section of the system control panel contains the
controls required by the operator when the CPU is
operating under full monitor control. A minimum of
direct intervention is required of the operator be-
cause the control program performs routine opera-
tions such as store and display. The main functions
provided on this panel section are the control and
indication of power and initial program load controls.
Power
On
PB Switch
The power-on switch initiates the power-on sequence
for the system. Power is applied to de supplies in
five groups. Power controls include sensing circuits
to prevent application of the next group until all
levels in the previous group are present. Power and
cooling failures bring power down in reverse sequence.
A system reset occurs at the completion of the
power-on sequence. The button is backlighted to indi-
cate when power is on and the 1,-0 Adapter relay has
stepped to completion. Power-on switch is active
only when emergency off switch is 'in'.
Power Off PB Switch
The power-off switch initiates the power-off se-
quence for the system.
154
(3/71)
Model 50 FEMM
Load PB Switch
The load switch causes a system reset and starts the
Initial Program Load (IPL) routine.
Load Unit Select Switches
Three rotary select switches provide an 11-bit
number to select the channel and 1/0 device for IPL.
The left switch has eight positions labeled O through
7 to select the channel. The other two switches se-
lect the device and are labeled with the hexadecimal
characters 0-9 and A-F.
Interrupt PB Switch
The interrupt switch causes an external interruption
request. The interruption is taken when not masked
off and when the CPU is not stopped. Otherwise the
interruption request remains pending. When the
interrupt is taken, bit 25 of the PSW is set to one
to indicate that the interrupt switch is the source of
the external interruption.
System Indicator
This indicator (PK101) is on whenever the customer
usage meter or the maintenance meter on the system
control panel is running.
Manual Indicator
This indicator (PKlOl) is on when the CPU is in the
stopped state.
Wait Indicator
This indicator (PKl 01) is on when the CPU is in the
wait state
(bit
14 of the current PSW is one).
Note: Opera.tions cannot be single-cycled while
the CPU is in the wait state.
Test Indicator
This indicator (PK101) is on when a manual control
is not in its normal position or when a maintenance
function is being performed for CPU, storage, or
channels. The following switches Ught the test in-
dicator when not in their normal positions:
Check Control
Manual Operation
Reverse Data Parity
Rate
FLT Mode
Addreu Compare (ROS)
FLT Control
Repeat Instruction (ROS)
Addre11 Compare (JAR)
Storage Test
Repeat Instniction (IAR)
Invert SAR Bit 16
Disable Interval Timer
CE Mode (Metering)
Address Compare (SAR) - Stop
Load Indicator
This indicator (PL031) is on while the CPU is ex-
ecuting the IPL routine. The indicator is turned on
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