graphic character. A character,
other
than
a control character,
that
is normally represented
by
a graphic.
half-duplex. (1)
In
data
cOJnmunication, pertaining
to
an
alternate,
one
way
at
a time,
independent
transmission.
(2)
Contrast
with duplex. "
hardware. (1) Physical equipment used in
data
processing, as
opposed
to programs, procedures, rules,
and
associated
documentation.
(2)
Contrast
with software.
head. A device
that
reads, writes,
or
erases
data
on
a storage
medium; for example, a small electromagnet used
to
read, write,
or
erase
data
on
a magnetic disk.
hertz (Hz). A unit
of
frequency equal
to
one cycle
per
second.
hex.
Common
abbreviation for hexadecimal. Also, hexidecimal
can
be
noted
as
X'
,
hexadecimal.
(1)
Pertaining
to
a selection, choice,
or
condition
that
has 16 possible different values
or
states. These values
or
states are usually symbolized
by
the
ten
digits 0 through 9
and
the
six letters A
through
F. (2) Pertaining to a fixed radix
numeration system having a radix
of
16.
high impedance state. A state in which the
output
of
a device is
effectively isolated from
the
circuit.
highlighting.
In
computer
graphics, emphasizing a given display
group
by
changing its attributes relative to
other
display groups in
the
same display field.
high-order position.
The
leftmost position in a string
of
characters. See also most-significant digit.
hither plane.
In
computer
graphics, a plane
that
is perpendicular
to
the
line joining the viewing reference point
and
the
view point
and
that
lies
between
these two points.
Any
part
of
an
object
between
the
hither
plane
and
the
view point is
not
seen. See also
yon
plane.
Glossary-16
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