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G
LOSSARY
Glossary-13
S-video: This connection provides
separate lines for contrast and color,
which produces a video image superior
to that produced by a composite
connection. See also RCA jack.
synchronous: Having a constant time
interval between successive bits,
characters or events.
system disk: A disk that has been
formatted with an operating system. For
MS-DOS the operating system is
contained in two hidden files and the
COMMAND.COM file. You can boot a
computer using a system disk. Also
called an operating system disk.
T
terminal: A typewriter-like keyboard
and CRT display screen connected to
the computer for data input/output.
TFT: A color LCD technology that
applies individual transistors to each
pixel enabling fine display control and
excellent screen legibility.
TTL: Transistor-transistor logic. A
logic circuit design that uses switching
transistors for gates and storage.
U
USB: Enables chain connection of a
number of USB-equipped devices to
one port on your computer. For
example, you might connect a USB-
HUB to the computer, then connect a
keyboard to the USB-HUB and a mouse
to the keyboard.
write protection
V
VGA: Video graphics array is an
industry standard video adapter that lets
you run any popular software.
volatile memory: Random access
memory (RAM) that stores information
as long as the computer is connected to
a power source.
W
Warm dock/undock: Connecting or
disconnecting a device to or from the
computer while the computer is
suspended.
warm start: Restarting or resetting a
computer without turning it off.
window: A portion of the screen that
can display its own application or
document. Often used to mean a
Microsoft Windows window.
Wireless LAN: A short-range radio
technology designed to simplify
wireless communication with other
LAN systems based on Direct Sequence
Spread Spectrum radio technology that
complies with the IEEE 802.11
Standard (Revision B) .
write protection: A method for
protecting a diskette (floppy disk) from
accidental erasure.