open collector. A switching transistor without
an
internal
connection between its collector and the voltage supply. A
connection from the collector to the voltage supply
is
made
through
an
external (pull-up) resistor.
operand. (1)
An
entity to which
an
operation
is
applied.
(2)
That
which
is
operated upon.
An
operand
is
usually identified
by
an address part of an instruction.
operating system. Software
that
controls the execution
of
programs;
an
operating system may provide services such as
resource allocation, scheduling,
input/output
control,
and
data
management.
OR. A logic operator having the property
that
if P
is
a
statement,
Q
is
a statement, R
is
a statement,..., then the
OR
of P,
Q,
R,
..
.is true if
at
least one statement
is
true, false if all
statements are false.
OR
gate. A gate in which the output
is
1 only if
at
least one
input
is
1.
output. Pertaining to a device, process,
or
channel involved in an
output process, or to the data
or
states involved in an output
process.
output process. (1) The process
that
consists
of
the delivery of
data from a
data
processing system,
or
from any part
of
it.
(2) The return of information from a data processing system to
an
end
user, including the translation of data from a machine
language to a language
that
the
end
user can understand.
overcurrent. A current
of
higher than specified strength.
overflow indicator. (1)
An
indicator
that
signifies when the last
line
on
a page has
been
printed
or
passed. (2)
An
indicator that
is
set
on
if the result of an arithmetic operation exceeds the
capacity of the accumulator.
overrun. Loss
Of
data
because a receiving device
is
unable
to
accept
data
at
the rate it
is
transmitted.
overvoltage. A voltage of higher
than
specified value.
Glossary-25
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