Appendix
A.
Glossary
The terms defined
in
this glossary apply to the
3278
Display Station and its
attachment
to
the
3274
and
3276
Control Units.
Analog card: A circuit card
that
converts digital
information into high·level signals for writing
characters on the display screen.
Attribute: A byte of
<lata
that
specifies
the
kind
of
display field.
An
attribute can specify
the
field as
protected or unprotected, for numeric, alphanumeric,
intensity, selector·pen detectability, and modification.
Bell: The sides
of
the cathode·ray tube (CRT)
between the display screen and the neck.
(See
Figure 5·2.)
Blanking: The ability
to
prevent writing
on
the
screen.
Clicker:
An
assembly
that,
when enabled, generates
a small sound when a key on the
~eyboard
is
pressed.
The sound indicates
to
the operator
that
the keyboard
has recognized the key pressed.
Coax: A shielded cable containing a single conductor.
Cone shield: A shield mounted
on
the neck
of
the
CRT.
(See Figure 5·1.)
Contrast: The difference
in
light intensity between
displayed characters.
Cursor:
An
underscore symbol
that
identifies a
character position
in
a screen display, usually
the
character position
at
which the
next
character
to
be
entered from
the
keyboard will be displayed.
(D): The logic
type
using three base cards. (See
Figures
1·1,4·6,
and 4·7.)
Divider scan: The straight line
that
is
continuously
written on the display screen above the
bottom
line.
(See Figure 3·1.)
SY27 ·2510-6
(1/81)
A·1
To Next Page
Loading...
Need help?
General
