UART {ewe-art} - (See "Universal Asynchronous Receiver/Transmitter")

Utra DMA [UDMA] - Protocol developed by Quantum Corporation and Intel for disk drives that enables the computer to take advantage of the fast Ultra ATA disk drives. (see "DMA")

uninstall - To remove installed software or hardware from the computer. Some applications must be removed with an uninstall program, which removes all files that were installed with the program and restores any modifications made to system files.

upgrade - A new or better version of some hardware or software. The act of developing or installing a new version.

upload - To transfer a file from your computer to another computer, using your terminal program and a transfer protocol.

URL {ewe-ar-ell} [Uniform Resource Locator] - URLs identify the location of specific sites, files or features on the Internet.

Universal Asynchronous Receiver/Transmitter [UART] - Chips that facilitate asynchronous serial communications.

Universal Serial Bus [USB] - pc bus that can support up to 127 peripheral devices in a daisy chain configuration.

UNIX {ewe-nix} - A computer operating system designed to be used by many people at the same time and has TCP/IP built-in.

Uninterruptable Power Supply (See "UPS")

UPS {ewe-pee-ess} [Uninterruptable Power Supply] - Battery-powered unit designed to supply continuous power to a computer in the event of a power failure.

URL {ewe-ar-ell} - (See "Uniform Resource Locator")

USB {ewe-ess-bee} (See "Universal Serial Bus")

USB memory stick (See "Flash drive")

USENET {ewes-net} - A network of newsgroups.

username - The string of characters which identifies you.

Uuencoding [Unix-to Unix encoding] - Encoding scheme that translates binary files (pictures, sounds, etc.) into ASCII (plain text) files. This permits the transference of binary files through non-binary protocols such as e-mail and newsgroups.