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4023
Users
APPENDIX
E
GLOSSARY
(cont.)
Display
Screen—
See
screen.
Display
Unit— That
section of
the
Terminal
which
includes
the
screen,
keyboard, and
associated
circuits.
Dual key entry—
Pressing a character
key
while holding the
CTRL
or
SHIFT
key
down.
Echoing-The
return of transmitted data to the transmitting
device.
Enter—
Synonomous
with
ENTER
key
actuated
trans-
mission of buffer contents. Also
can
refer
to
keyboard
entry
directly
to the
computer
or to
the
buffer.
Erasing—
Removing
displayed data
from
the
screen.
Form
Fill-Out—
Function
used
with
formatted
displays
where
the operator
fills
in
the blank spaces or otherwise
changes
the information displayed.
Formatted Display—
A
display that
is
arranged
to
resemble
a
form
or
other source
document
through
use of
Field
Attribute Codes.
Field
Attribute
Codes-Codes
used
by
the
4023
that
arrange the display
into
fields.
Data
residing
in
the
fields
is
identified
by
the
code
as
to appearance,
transmittability,
and
protection.
Fields-Specific portions of the display that contain data
identified
by
Field
Attribute
Codes
as
to
the
data's
appearance,
transmittability,
and
protection.
The
size
of
a
field
can be
from one
to seventy-nine characters
(one
line
maximum).
Full
Duplex—
In
data
communications,
full
duplex
refers
to
the
ability
of data transmissions
between
the
Terminal and
computer
to
occur
in
both
directions
simultaneously;
both
stations
can transmit
and
receive
at
the
same
time.
Hard
copy—
A
reproduction
(on
paper)
of
a
Terminal
display.
Hard
Copy
Mode—
The
operating
status
achieved
by
the
Terminal during
copy
making.
Hard
Copy
Unit—
An
instrument
which
generates
paper
copies of
Terminal
displays.
Hardware— The
mechanical, magnetic,
electrical,
and
elec-
tronic devices
and
components
of
data processing equip-
ment.
Home—
The
first
line,
first
character
position.
Exists at
top-left
of the
screen.
Initial
Condition—
Logic condition of the Terminal
when
power
is
turned
on
or the screen
is
erased.
Initializing—
Turning
the
Terminal
power
on, or returning
the Terminal to
its
initial
condition.
Interface—
The
unit
which
permits
two
devices to
interact
with each
other. Specifically,
the
unit
which makes
the
Terminal compatible with
a
computer,
modem,
or
periph-
eral
equipment.
Jack— The
least-portable
of
two
mating
connectors.
Keyboard Entry—The manual
insertion of
data
into
a
data
processing
system
using the
Terminal keyboard.
Keyboard
data can be entered
directly
to the
system, or entered
first
to
the
Terminal
buffer, edited,
then transmitted
to the
system
using the
Enter
or
Send
function.
Letter
keys—
Commonly
used
to
denote
the
keys
which
generate the
code
for
Roman
(conventional
English)
letters.
Line—
A
display
consisting
of
80
horizontally adjacent
characters; also the
space allocated to such
a display.
Half
Duplex—
Data
communications
proceeds
in
only
one
direction
at a
time.
The
Terminal
or
computer
can
either
transmit or
receive,
but never both
at
the
same
time.
®
Line
feed—
Movement
of
the writing
beam
from
a
line
to
the next lower
line;
also
the
command
which
causes such
movement.
E-3
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