function keys — The keys that perform editing functions in
MS-DOS and have application-defined functions at other
times.
graphics — Visual patterns displayed on the screen or
produced on a printer; usually formed by patterns of dots.
hard drive — A combination of a drive mechanism and
permanently sealed storage medium; capable of storing
large amounts of information.
hardware — The physical components of a computer:
central processing unit, internal memory, drives, printer,
display unit, option boards, external devices, etc. Contrast
with software.
hardware options — Any of several devices that can make
your computer more efficient and powerful.
head — A small electromagnetic device that reads, records,
and erases data on a magnetic storage medium, such as a
drive or tape. Also called a read-write head.
hexadecimal — A numbering system that consists of 16
symbols, 0 to 9 and A to F; used by programmers as a
convenient method of expressing binary values.
input — Information that enters the computer.
input/output — An operation that transfers information
from the central processing unit to a device or from a device
to the central processing unit. An example is storing and
retrieving information with a floppy.
integrated circuit — A microscopic grouping of electronic
components and their connections mounted on a small
chip of material, usually silicon.
Glossary
Glossary 9
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