Depress the Q key to reset the -Plus I Mode. In this mode the memory
address register cannot be modified during a memory read or write from
the control panel.
Depress the.§. key to place the processor in the Run State. In this state
the processor executes instructions starting at the location specified by
the program counter. Execution continues until the S key is depressed
or up to the first halt instruction.
aRefer to color of key.
TABLE 2-2. STATUS INDICATOR LIGHTS
Lights to indicate that dc power is on.
Lights to indicate a Mega bus element has not successfully completed its logic test
or that a Mega bus element is not plugged into the bus properly.
Lights to indicate that the processor is executing instructions other than the HALT
Lights to indicate the processor is in the RUN State; i.e., it is executing a program.
If the TRAFFIC light is off while the RUN light is on, the processor is halted.
Lights when the L key is depressed.
Lights when the C key is depressed.
Lights when the plus
key is depressed. The light goes off when the reset-to-zero
(0) key is depressed.
Lights when the W key is depressed.
Lights when the white R key is depressed.
Lights when the red S key is depressed.
Lights when the red R key is depressed. Depress the E key to run.
Operator maintenance includes such preven
A six-digit hexadecimal (hex) display in the
tive maintenance as normal checking, cleaning,
upper part of the panel marked REGISTER
operating considerations, etc., performed periodi
indicates the two-digit LOCATION and four digit
cally on a routine scheduled basis. The purpose of
CONTENTS of any of the twenty-one registers.
the maintenance is to keep the central SUbsystem
Table 2-3 indicates the applicable codes for
in the best of operating conditions, thereby
reducing the possibility of downtime.
The following list is a general guide to opera
Register Keys (Hex Pad)
The set of 16 hexadecimal keys in the right
part of the control panel marked REGISTERS is
o Ensure that the central processor is plugged
called the hex pad. These keys provide access to
into a 3- wire, grounded outlet.
the twenty-one user-visible registers.
In the select mode, a hex pad entry selects the
o Ensure that all covers are closed and
register to be operated on, and the digits entered
secured during operation.
light up under LOCATION in the Register Dis
o If the central subsystem is freestanding:
In the change mode, a hex pad entry changes
o Do not lean on any part of cabinet
the contents of the selected register, and the
o Do not place objects on the cabinet
digits entered light up under CONTENTS in the
Register Display. Each keystroke shifts and loads
o Food or beverages should not be near
one hexadecimal digit into the least significant
hexadecimal position of the selected register and
o Keep cover clean and free of debris
CENTRAL PROCESSOR CONTROL PANEL