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Numeric keypad
The number and cursor control keys grouped together on the
right side of the keyboard. The operation of the dual-use keys
on the numeric keypad is controlled by the key.
Operating speed
The speed at which the computer’s processor can execute
commands, usually expressed in megahertz (MHz). See also
Megahertz.
Operating system
A collection of programs
that
manage a computer’s operations,
such as interpreting input, managing files, and reading and
writing data to disk. The operating system (such as MS-DOS,
OS/2, or UNIX) provides the foundation for the other
programs and controls hardware resources.
Option curd
A circuit board you can install inside the computer to provide
additional capabilities, such as a modem or an additional I/O
port. Option cards plug directly into option slots so you do not
have to alter a computer’s circuitry to enhance your system.
OS/2
Operating System/2. The operating system developed jointly
by Microsoft and IBM that provides protected mode processing
and multitasking capabilities. See also DOS,
MS-DOS,
and
Operating system.
OverDrive processor
An optional microprocessor chip that doubles the internal
processing speed of the microprocessor and includes a built-in
math coprocessor.
10 Glossay