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when the load switch is pressed and is turned off
after the read operation and loading of the new Pro-
gram Status Word (PSW) are successfully completed.
OPERATING INSTRUCTIONS
•
Power, interrupt, and initial program load
switches on panel section N provide basic system
control.
•
Switches and indicators on panel sections L and
M
permit program intervention by the operator.
The switches on panel section N permit the manual
operations that are necessary when the system is
to be operated under full supervisor control. Power
switches apply or remove system power; initial
program load switches reset the system and load
the first program; and the interrupt switch allows
an
~xternal
interrupt request to be made. Five in-
dicators on panel section N display overall system
status to the operator. Start, stop, reset, display.
store. and other intervention operations are per-
formed with the switches and indicators located on
panel sections L and M.
System Initialization
System initialization results from a system reset.
A system reset occurs with the power-on sequence,
the initial program load routine, or from the de-
pression of either the system reset or the PSW re-
start switch.
Initial Program Load (IPL)
Initial program load is performed by selecting a
properly-prepared input device with the load unit
rotary select switches and pressing the load push-
button switch. The three rotary switches provide the
11-bit address of the desired device. The leftmost
switch, labeled 0-7, designates the channel number.
The two remaining switches. labeled with the Hex
characters 0-9 and A-F, designate the device.
Pressing the load pushbutton switch causes a system
reset, turns on the load indicator, turns off the man-
ual indicator, and initiates a read operation from the
selected input device.
IPL reads new information into the first six words
of main storage. The remainder of the IPL program
may be placed in any desired section of storage.
Storage protection, program controlled interruption,
and incorrect length indication are ignored.
Display and Store Operations
Intervention controls on panel sections L and M per-
mit the operator to display or store data in main
storage, in local storage, and in the working PSW.
For these operations the system must be in the
stopped state (manual indicator on). The stopped
state is achieved at the end of the current instruction
when the stop switch is pressed, when single instruc-
tion execution is specified, or when a preset stop ad-
dress is reached.
Display Main Storage
1. Manual mode.
2. Set the desired address in address switches 8
through
29.
3.
Turn the storage select switch to "Main."
4. Press the display switch.
5.
The word at the desired address is displayed
in the SDR indicators.
Store in Main Storage
1.
Manual Mode.
2.
Set the desired address in address switches
8
through
29.
3. Turn the storage select switch to "Main."
4. Set the desired data switches.
::;, Press the store switch.
Display Local Storage
1.
Manual mode.
2. Set the sector to be displayed in address
switches 22 and 23.
3. Set the word to be displayed in address switches
24 through 27.
4. Turn the storage select switch to "Local. "
5. Press the display switch.
6. The selected word is displayed in the L Register
(CPU Roller
#1,
Switch Position #1).
Store in Local Storage
1.
Manual mode.
2. Set the desired sector in address switches 22
and 23.
.3.
Set the desired word in address switches 24
through 27.
4. Set the desired data switches.
5. Set the storage select switch to "Local."
6. Press the store switch.
Display the Working PSW
1. Manual mode.
2. Set address 170 in the address switches.
3. Set the storage select switch to "Local."
4. Press the display switch.
5. The working PSW (first half) is displayed in
the L Register (CPU Roller #1, Position #1).
Appendix B--System Control Panel
(3/71)
155
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