IBM AT 5170 Technical Reference page 476

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
programs.
programmable read-only memory (PROM). A read-only memory
that can be programmed by the user.
programming language.
(1)
An artificial language established for
expressing computer programs.
(2)
A set of characters and rules
with meanings assigned prior to their use, for writing computer
programs.
programming system. One or more programming languages and
r-..
the necessary software for using these languages with particular
automatic data-processing equipment.
PROM. Programmable read-only memory.
propagation delay.
(1)
The time necessary for a signal to travel
from one point on a circuit to another.
(2)
The time delay
between a signal change at an input and the corresponding change
at an output.
protocol.
(1)
A specification for the format and relative timing
of information exchanged between communicating parties.
(2)
The set of rules governing the operation of functional units of
a communication system that must be followed if communication
is to be achieved.
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Glossary-30