IBM 5150 PC Technical Reference (6025005, August, 1981) (PDF)

GLOSSARY
1. Address Buss: A set of wires or signals carrying the binarycoded
address from the Intel-8088 microprocessor throughout
the rest of the IBM Personal Computer System Unit.
2. AEN: Address Enable. (Refer to System Board I/O Channel
Descriptions).
3. ALE: Address Latch Enable. (Refer to System Board I/O
Channel Descriptions).
4. Analog: (1) Pertaining to representation by means of continuously
variable physical quantities. (2) Contrast with digital.
5. A!N: Alphanumeric: Pertaining to a character set that contains
letters, digits, and usually other characters, such as punctuation
marks. Syonymous with alphameric.
6. AO-AI9: Address bits 0-19. (Refer to System Board I/O
Channel Descriptions).
7. APA: All points addressable graphics.
8. ASCII: American Standard Code of Information Interchange.
The standard code, using a coded character set consisting of7­
bit coded characters (8 bits including parity check), used for
information interchange among data processing systems, data
communication systems and associated equipment. The
ASCII set consists of control characters and graphic
characters.
9. Assembler: A computer program used to assemble. Synonymous
with assembly program.
10. BASIC: (Beginner's all-purpose symbolic instruction code). A
programming language with a small repetoire ofcommands and
a simple syntax, primarily designed for numerical application.
11. BAUD: (1) A unit of signaling speed equal to the number of
discrete conditions or signal events per second in Morse code,
one bit per second in a train of binary signals, and one 3-bit
value per second in a train of signals each ofwhich can assume
one of eight different states. (2) In asynchronous transmission,
the unit ofmodulation rate corresponding to one unit ofinterval
per second, i.e. if the duration of the unit interval is 20
milliseconds, the modulation rate is 50 baud.
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