IBM 5170 Technical Reference page 429

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.
potentiometer.
A variable resistor with three terminals, one at
each end and one on a slider (wiper).
power supply.
A device that produces the power needed to
operate electronic equipment.
printed circuit.
A pattern of conductors (corresponding to the
wiring of an electronic circuit) formed on a board of insulating
material.
printed-circuit board.
A usually copper-clad plastic board used to
make a printed circuit.
priority.
A rank assigned to a task that determines its precedence
in receiving system resources.
processing program.
A program that performs such functions as
compiling, assembling, or translating for a particular programming
language.
processing unit.
A functional unit that consists of one or more
processors and all or part of internal, storage.
processor. (1) In
a computer, a functional unit that interprets and
executes instructions. (2) A functional unit, a part of another
unit such as a terminal or a processing unit, that interprets and
executes instructions. (3) Deprecated term for processing
program. (4) See microprocessor.
program.
(1) A series of actions designed to achieve a certain
result. (2) A series of instructions telling the computer how to
handle a problem or task. (3) To design, write, and test computer
,r--.,
programs.
programmable read-only memory
(PROM). A read-only memory
that can be programmed by the user.
Glossary-27