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terminal: A typewriter-like keyboard and CRT display screen connected to the
computer for the input/output of data.
TDIAG: A diagnostic program used for testing and configuring the RAM, printer,
diskette drive, and video system on the T1950 series computers.
TFT: A color LCD technology that applies individual transistors to each pixel
enabling fine display control and execellent screen legibility.
touch-tone dialing: A dialing technique used by the modem. Each digit (or # or
*) is represented by two tones. Also called DTMF (dual tone multi-frequency).
TTL: Transistor-transistor logic. A logic circuit design that uses switching
transistors for gates and storage.
U
upper memory area (UMA): The area of memory between 640 KB and 1 MB. This area,
used mostly for video memory and other system functions, also contains small
blocks of memory (upper memory blocks) that the computer can use for device
drivers and other memory resident program.
upper memory block (UMB): Continuous regions of the upper memory area into
which the computer may load programs and device drivers.
V
VDISK: Virtual disk. Part of the computerÕs random access memory assigned to
simulate a disk. VDISK is a feature of MS-DOS operating system.
VGA: Video graphics array is an industry standard video adapter that lets you
run any popular software.
virtual 8086 mode: A microprocessor mode introduced with the Intel 80386
processor that allows the computer to emulate multiple real mode processors
(8086) and still switch to and from protected mode.
volatile memory: Random access memory (RAM) that stores information as long as
the computer is connected to a power source.
W
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.
write protection: A method for protecting a floppy disk (diskette) from
accidental erasure.