Glossary
analog signal: A signal whose characteristics such as amplitude and frequency vary in proportion to (are an analog of) the value to be transmitted. Voice communications are analog signals.
application: A group of programs that together are used for a specific task such as accounting, financial planning, spreadsheets, word processing and games.
ASCII: American Standard Code for Information Interchange. ASCII code is a set of 256 binary codes that represent the most commonly used letters, numbers, and symbols.
asynchronous: Lacking regular time relationship. As applied to computer communications, asynchronous refers to the method of transmitting data that does not require a steady stream of bits to be transmitted at regular time intervals.
B
backup: A copy of a file, usually on a removable disk, kept in case the original file is lost or damaged.
binary: The base two number system composed of zeros and ones (off or on), used by most digital computers. The
ASCII.
BIOS: Basic Input/Output System. The firmware that controls data flow within the computer. See also firmware.
bit: Derived from "binary digit," the basic unit of information used by the computer. It is either zero or one. Eight bits is one byte. See also byte.
Bluetooth: A
board: A circuit board. An internal card containing electronic components, called chips, which perform a specific function or increase the capabilities of the system.
boot: Short for bootstrap. A program that starts or restarts the computer. The program reads instructions from a storage device into the computer’s memory.
boot disk: See system disk.
bootable disk: See system disk.
bps: Bits per second. Typically used to describe the data transmission speed of a modem.
buffer: The portion of the computer’s memory where data is temporarily stored. Buffers often compensate for differences in the rate of flow from one device to another.
bus: An interface for transmission of signals, data or electric power.
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