Register Display; Register Keys (Hex Pad); Operator Maintenance - Honeywell LEVEL 6 Operation Manual

Key Function Key Color Description
0
PlusQ
White
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.
E Execute Black 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
. .
Indicator Description
DC ON
Lights to indicate that dc power is on.
CHECK
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.
TRAFFIC Lights to indicate that the processor is executing instructions other than the HALT
instruction.
RUN
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.
LOAD
Lights when the L key is depressed.
CHANGE
Lights when the C key is depressed.
PLUS
Lights when the plus
1
key is depressed. The light goes off when the reset-to-zero
(0) key is depressed.
WRITE
Lights when the W key is depressed.
READ
Lights when the white R key is depressed.
STOP/STEP
Lights when the red S key is depressed.
READY
Lights when the red R key is depressed. Depress the E key to run.
OPERATOR MAINTENANCE
Register Display
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
register selection.
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
tor maintenance:
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:
play.
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
the cabinet
hexadecimal position of the selected register and
o Keep cover clean and free of debris
display.
AT04
CENTRAL PROCESSOR CONTROL PANEL
2-3