The s

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*UART*		Universal Asynchronous Receiver-Transmitter. The chip that controls the serial ports.
UL		Underwriters Laboratories. They test product safety.
ULSI		Ultra Large Scale Integration. IC's that have more than 100,000 components. The components are definitely microscopic.
ultralight computer		A small, lightweight computer. Smaller than a notebook computer.
UNIX		A multiuser operating system developed at AT&T in 1969.
up		Functional. When your system is powered on and ready to use. Compare down.
UPS		Uninterruptable Power Supply. A device that supplies power to your computer if the power goes off, allowing you time to shut down your computer normally, without losing data.
upload		To copy a file from your computer onto a storage device, especially if the device is another computer. Compare download.
upward compatibility		Software that is expected to operate correctly on future systems. Compare downward compatibility .
URL		Uniform Resource Locator. A standard for specifying something, such as a file, graphic, or newsgroup, on the Internet or World Wide Web. URL's are also used to specific the target of a hyperlink.
USB		Universal Serial Bus. A standard for communication between IBM PC compatibles and external peripherals over a cable using biserial transmission.
user		A person who works with a computer without bothering about the hows and whys of its functionality. A person who reports bugs instead of fixing them.
user-friendly		An overused term that means easy to learn and use.

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