The Power ON/OFF switch, located on the
Turning the keylock to the left locks the
left side of the central processor, is the primary
control panel. All switches, keys and registers are
power supply switch.
disabled. The ON/OFF switch remains operable.
Turning the Keylock to the right unlocks the
Positioning the ON/OFF switch up to the ON
panel. In the unlocked state the panel can be used
position applies ac power to the central processor.
for normal operations.
Positioning the ON/OFF switch down to the
There are eleven keys for controlling the
OFF position removes ac power from the central
various central processor states and operating
modes. Each of these keys is discussed in Table
Panel Security Keylock
The Panel Security Keylock, located to the
Status Indicator Lights
immediate right of the ON/OFF switch, is used to
Eleven lights located in the area of the panel
enable/disable all switches and keys on the
labeled MONITOR indicate the status and operat
control panel (except for the Power ON/OFF
ing modes. Each of these lights is discussed in
TABLE 2-1. CENTRAL PROCESSOR CONTROL KEYS
Depress the boad key to place the processor in the !:.oad Mode. Depres
sing the E key will bootload a program into memory.
key to place the processor in the
this mode the processor is ready to accept operator modifications to the
contents of selected registers.
Depress the Plus
key to place the processor in Plus
Mode. In this
mode the processor is ready to read or write successive memory locations
from the control panel, and each depression of the E key causes the mem
ory address register to be incremented by 1.
Depress to place the processor in
Mode. In this mode the processor
the contents of the selected register into the location addressed
by the memory address register (AO).
Depress the .!S,ead key to place the processor in the Read Mode. In the
Read Mode the processor reads the contents of the selected register
from the location addressed by the memory address register (AO).
Depress the ..§.top key to stop instruction execution and place the proces
sor in the ..§.top State. In this state each depression of the E key causes
execution of one instruction so that the operator may step through a
Depress the Ready key to place the processor in the Ready Mode (.!S,eady
indicator ON). In this mode the processor is ready to execute.
key is depressed program execution begins and the RUN indicator
key to clear the processor. This action resets the in
struction register (DO) and the program counter (EO) to zero and clears
any order pending in the processor. Master clear can be performed only
in the STOP State.
key to place the processor in the ..§.elect Mode. The
register to the operated on is selected by keying in the proper selection
code from the hexadecimal pad.
CENTRAL PROCESSOR CONTROL PANEL