simultaneity of two or more processes. (4) Pertaining
to
the
simultaneous processing
of
the individual parts of a whole, such as
the bits of a character and the characters
of
a word, using
separate facilities for the various parts.
(5) Contrast with serial.
parameter.
(1)
A variable that is given a constant value for a
specified application and that may denote the application.
(2)
A
name in a procedure that is used to refer to an argument passed to
that procedure.
parity bit. A binary digit appended to a group of binary digits
to
make the sum of all the digits either always odd (odd parity) or
always even (even parity).
parity check.
(1)
A redundancy check that uses a parity bit.
(2)
Synonymous with odd-even check.
PEL. Picture element.
personal computer. A small home or business computer that has a
processor and keyboard and that can be connected to a television
or
some other monitor.
An
optional printer
is
usually available.
phototransistor. A transistor whose switching action
is
controlled
by light shining
on
it.
picture element
(PEL). The smallest displayable unit on a display.
polling.
(1)
Interrogation of devices for purposes such as
to
avoid
contention,
to
determine operational status,
or
to
determine
readiness to send
or
receive data.
(2)
The process whereby
stations are invited, one
at
a time, to transmit.
port. An access point for data entry or exit.
positive true. Synonym for active high.
positive-going edge. The edge of a pulse or signal changing in a
positive direction. Synonymous with rising edge.
Glossary-16
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