Table of Contents
Advertisement
controller: An electronic device that automatically operates a unit or regulates a process.
For example, the computer's built-in disk drive controller takes information from
the computer and translates it into a form usable by the hard drive. Unlike an
adapter, which in its simplest form can be hardware only, a controller always
includes firmware or software. A controller can take a number of forms, such
as a chip on the motherboard or an add-in board. See also adapter, firmware,
hardware, software.
conventional memory: The first 640 KB of random access memory (RAM) where the
operating system runs programs and stores information. Also called base
memory.
cursor: A symbol that indicates the current position on the screen. The shape of the
cursor varies, depending on the program you're using and what you're doing.
D
data: Information that a computer can process. The word "data" is actually plural for
"datum," meaning a single piece of information.
data bits: A data communications parameter controlling the number of bits used to
represent a character. If data bits = 7, the computer can generate 128 unique
characters, if data bits = 8, the computer can generate 256 unique characters.
decimal: The base-ten numbering system normally used by people. Computers, in
contrast, generally use binary or hexadecimal numbering systems. See also
binary, hexadecimal.
default: Values or options selected by the processor, a controller, or a program when you
do not specify a setting. For example, a preset value in a dialog box.
delete: To remove information. Examples are removing a line of text from within a
program or removing files from a disk or other storage device. Synonymous
with erase.
deselect: To remove highlighting from text, such as an item in a list or menu, or to remove
handles from graphical objects.
163
Advertisement
Table of Contents
