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User’s Manual Glossary-5
Glossary
computer program: A set of instructions written for a computer that
enable it to achieve a desired result.
computer system: A combination of hardware, software, firmware, and
peripheral components assembled to process data into useful
information.
configuration: The specific components in your system (such as the
terminal, printer, and disk drives) and the settings that define how
your system works. You use the HW Setup program to control your
system configuration.
controller: Built-in hardware and software that controls the functions of a
specific internal or peripheral device (e.g. keyboard controller).
CPU: Central Processing Unit. The portion of the computer that interprets
and executes instructions.
CRT: Cathode Ray Tube. A vacuum tube in which beams projected on a
fluorescent screen-producing luminous spots. An example is the
television set.
cursor: A small, blinking rectangle or line that indicates the current
position on the display screen.
D
data: Information that is factual, measurable or statistical that a computer
can process, store, or retrieve.
data bits: A data communications parameter controlling the number of bits
(binary digits) used to make up a byte. If data bits = 7 the computer
can generate 128 unique characters. If data bits = 8 the computer
can generate 256 unique characters.
DC: Direct Current. Electric current that flows in one direction. This type of
power is usually supplied by batteries.
default: The parameter value automatically selected by the system when
you or the program do not provide instructions. Also called a preset
value.
delete: To remove data from a disk or other data storage device.
Synonymous with erase.
device driver: A program (called a "driver") that permits a computer to
communicate with a device.
dialog box: A window that accepts user input to make system settings or
record other information.
disable: To turn a computer option off. See also enable.
disk drive: The device that randomly accesses information on a disk and
copies it to the computer’s memory. It also writes data from memory
to the disk. To accomplish these tasks, the unit physically rotates
the disk at high speed past a read-write head.
disk storage: Storing data on magnetic disk. Data is arranged on
concentric tracks much like a phonograph record.