graphic character. A character, other than a control character,
that is normally represented by a graphic.
half-duplex.
(1)
In
data communication, 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.
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.
honsekeeping. Operations
or
routines that do
not
contribute
directly
to
the solution
of
the problem
but
do contribute directly
to
the operation
of
the
computer.
Hz. Hertz
Glossary-16
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