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address switches: Switches that permit the setting of
a discrete address for each device on a system cable
(line). These switches are 1, 2, and 3 on the switch
block at the rear of the display station. See reference
420.
anode: The high voltage connector on the cathode-ray
tube.
attribute: A characteristic that controls how data is
displayed on the display screen. For example, the
attributes of a display field include blinking, high
intensity, and reverse image.
bezel: The mounting frame for the cathode-ray tube in
the display unit.
blink attribute: An attribute of a display field that
causes the characters to flash.
blink or blinking: Flashing.
brightness control: A potentiometer on the CRT PC
board that controls raster brightness. This control is not
accessible to the operator. See reference
230.
Brightness control (operator): A potentiometer on the
underside of the Display Unit for adjusting the
brightness of the data on the display screen. This
control is accessible to the operator. See reference
230.
Cable Thru: A function that permits multiple display
stations or printers to be attached serially to a system
cable.
callout: A character, number, or name used to identify
a particular part of a figure.
character set: A group of characters contained in a
character generator. See reference
620.
Cmd key: The command key on the keyboard that is
used to select command functions.
column separator: A dot that separates all the
characters in a field of data.
Glossary of Terms and Abbreviations
command function keys: The 14 keys in the top row
of the display station keyboard that are used with the
Cmd (command) key to request functions.
controller: A device that controls the operation of one
or more input or output devices.
CRT: Cathode-ray tube.
field attribute: The control characters that describe a
displayed field. For example, a displayed field can be
intensified, reversed, underscored, or made to blink.
FRU: Field-replaceable unit.
hex: Hexadecimal.
1/0: Input/ output.
ID: Identification.
implode: To break inward suddenly.
Ins key: The key on the keyboard that is used to select
insert mode.
IPL: Initial program load. The first machine program
operation after power on.
Keylock RPQ: A lock and key that prevents the use of
the display station.
keystroke: The action of pressing a key on the
keyboard.
KU: Keyboard unit.
LC: Line check.
line check: A check for errors that occur during the
transmission of data from the system controller to the
display station.
LU: Logic unit (planar).
mandatory: Something that must be done or must be
present.
menu: A list of options that can be selected.
Glossary
vii
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