Glossary Of Terms And Abbreviations - IBM 5251 Series Maintenance Information Manual

p.f: Microfarad.
activity: Action or process.
addr: Address.
alpha: Alphabetic.
ALU: Arithmetic logic unit.
amplifier: A device that increases a voltage or a signal
to a usable level.
anode: A positive terminal of a diode.
arithmetic: The adding, subtracting, multiplying, or
dividing of two or more numbers.
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.
blink attribute: An attribute of a display field that
causes the characters to flash.
brightness limiter potentiometer: A potentiometer
that prevents too much brightness. See reference 150.
buffer: A temporary storage area.
Cable Thru feature: A special feature that permits
multiple display stations or printers to be attached
serially to a system cable.
callout: A character used to identify a particular portion
of an illustration.
capacitive: Having capacitance.
cathode: A negative terminal of a diode.
char: Character.
character matrix: A part of the display screen
character window. The character matrix is 16 dots high
by 8 dots wide.
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Glossary of Tenns and Abbreviations
character window: A part of the display screen that is
24 dots high by 10 dots wide and includes the character
matrix.
clicker: A solenoid in the keyboard that makes a sound
after each keyboard character has been received by the
display station.
Cmd key: The command key on the keyboard that is
used to select command functions.
column separator: A vertical bar in a field of data that
separates all characters in that field.
command function keys: The 14 keys on the top row
of the display station keyboard that are used with the
Cmd (command) key to request functions.
cont: Controller.
Contrast control: The device that changes the contrast.
See reference 100.
controller: A device that controls the operation of one
or more input or output devices.
data stream: A continuing flow of data.
diag: Diagnostic.
driver: A source that sends (drives) a signal from one
location to another. See reference 212.
dual: Having two similar parts.
Dup key: The key on the keyboard that is used to
duplicate a field from a preceding field.
EOM: End of message.
end-of-message delimiteJ: A 111 in the station I D field
that indicates the last frame of a message block.
EOQ: End of queue.
ERAP: Error recording analysis procedures.
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