IBM 5150 Technical Reference page 264

assembler. A computer program used to assemble.
assembler language. A computer-oriented language whose
instructions are usually in one-to-one correspondence with
computer instructions.
/"""""'\ asynchronous transmission.
(1)
Transmission in which the time of
occurrence of the start of each character, or block of characters,
is arbitrary; once started, the time of occurrence of each signal
representing a bit within a character, or block, has the same
relationship to significant instants of a fixed time frame.
(2)
Transmission in which each information character is individually
transmitted (usually timed by the use of start elements and stop
elements).
audio frequencies. Frequencies that can be heard by the human
ear (approximately 15 hertz to 20000 hertz).
auxiliary storage.
(1) A
storage device that is not main storage.
(2)
Data storage other than main storage; for example, storage on
magnetic disk. (3) Contrast with main storage.
BASIC. Beginner's all-purpose symbolic instruction code.
basic input/output system (BIOS). The feature of the IBM
Personal Computer that provides the level control of the major
I/O devices, and relieves the programmer from concern about
hardware device characteristics.
baud.
(1) A
unit of signaling speed equal to the number of
discrete conditions or signal events per second. For example, one
baud equals one bit per second in a train of binary signals,
one-half dot cycle per second in Morse code, and one 3-bit value
per second in a train of signals each of which can assume one of
eight different states.
(2)
In asynchronous transmission, the unit
of modulation rate corresponding to one unit of interval per
second; that is, if the duration of the unit interval is 20
"...-..."
milliseconds, the modulation rate is 50 baud.
BCC. Block-check character.
Glossary-3