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User’s Manual Glossary-11
PORTÉGÉ M750
N
non-system disk: A formatted floppy diskette you can use to store
programs and data but you cannot use to start the computer. See
system disk.
nonvolatile memory: Memory, usually read-only (ROM), that is capable of
permanently storing information. Turning the computer’s power off
does not alter data stored in nonvolatile memory.
numeric keypad overlay: A feature that allows you to use certain keys on
the keyboard to perform numeric entry, or to control cursor and page
movement.
O
OCR: Optical Character Recognition (reader). A technique or device that
uses laser or visible light to identify characters and input them into a
storage device.
online state: A functional state of a peripheral device when it is ready to
receive or transmit data.
operating system: A group of programs that controls the basic operation
of a computer. Operating system functions include interpreting
programs, creating data files, and controlling the transmission and
receipt (input/output) of data to and from memory and peripheral
devices.
output: The results of a computer operation. Output commonly indicates
data.
1) printed on paper, 2) displayed at a terminal, 3) sent through the
serial port of internal modem, or 4) stored on some magnetic media.
P
parity: 1) The symmetrical relationship between two parameter values
(integers) both of which are either on or off; odd or even; 0 or 1.
2) In serial communications, an error detection bit that is added to a
group of data bits making the sum of the bits even or odd. Parity can
be set to none, odd, or even.
password: A unique string of characters used to identify a specific user.
The computer provides various levels of password protection such
as user and supervisor.
pel: The smallest area of the display that can be addressed by software.
Equal in size to a pixel or group of pixels. See pixel.
peripheral component interconnect: An industry standard 32-bit bus.