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 con-
nection. See also RCA jack.
synchronous: Having a constant time
interval between successive bits, char-
acters or events.
system disk: A disk that has been for-
matted with an operating system. For
MS-DOS the operating system is con-
tained 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 exam-
ple, 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 informa-
tion as long as the computer is con-
nected to a power source.
W
Warm dock/undock: Connecting or
disconnecting a device to or from the
computer while the computer is sus-
pended.
warm start: Restarting or resetting a
computer without turning it off.
window: A portion of the screen that
can display its own application or doc-
ument. Often used to mean a Microsoft
Windows window.
Wireless LAN: A short-range radio
technology designed to simplify wire-
less communication with other LAN
systems based on Direct Sequence
Spread Spectrum radio technology that
complies with the IEEE 802.11 Stan-
dard (Revision B).
write protection: A method for pro-
tecting a diskette (floppy disk) from
accidental erasure.
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