IBM AT 5170 Technical Reference page 448

address bus. One or more conductors used to carry the
binary-coded address from the processor throughout the rest of
the system.
algorithm. A finite set of well-defined rules for the solution of a
problem in a finite number of steps.
r"­
ail points addressable (APA). A mode in which all points of a
displayable image can be controlled by the user.
alphameric. Synonym for alphanumeric.
alphanumeric (A/N). Pertaining to a character set that contains
letters, digits, and usually other characters, such as punctuation
marks. Synonymous with alphameric.
alternating current (ac).
direction of flow.
A current that periodically reverses its
American National Standard Code for Information Interchange
(ASCII). The standard code, using a coded character set
consisting of 7-bit coded characters (8 bits including parity
check), used for information exchange between data processing
systems, data communication systems, and associated equipment.
The ASCII set consists of control characters and graphic
characters.
r"­
ampere (A). The basic unit of electric current.
A/N. Alphanumeric
analog.
(1)
Pertaining to data in the form of continuously
variable physical quantities.
(2)
Contrast with digital.
AND.
A logic operator having the property that if P is a
statement,
Q
is a statement, R is a statement, ... , then the AND of
P,
Q,
R, .. .is true if all statements are true, false if any statement is
false.
Glossary-2