UART Acronym for Universal Asynchronous Receiver/Transmitter.  It is a device that converts serial to parallel digital data and vice versa so that it can be transmitted and received by a modem.
UDDI Acronym for Universal Description Discovery and Integration.  It is a public, XML-based registry that lets businesses list Web services on the Internet, allow enterprises to find and hook up to other Web services as needed.
UDF The UDF, or Universal Disk Format, is a new way to organise information on a CD-ROM, CD-R, CD-RW, or DVD disc. UDF is meant to replace the old ISO9660 method used pretty much since CD-ROMs were invented. The new standard makes storing all kinds of digital information on the one kind of disc--especially the DVD--easier. It also lets you use that disc in a variety of readers and players.
Ultra ATA/66 Basically, ATA/66 is a really fast way to get information in and out of a hard drive and comes close to the speed that the computer bus moves information between processor and memory.
Also known as Ultra DMA/66 and Fast ATA-2, this new interface between hard drives and computer systems has twice the maximum data transfer rate of the previous Ultra ATA/33 interface. The 66.6MB/s rate is four times the older DMA Mode 2 interface rate of 16.6MB/s and is backward compatible with both Ultra ATA/33 and DMA Mode 2.
UNC Universal Naming Convention.  Primarily used on Microsoft Networks (ie. NT networks) and used to refer to a location in the network domain such as a disk drive on a server.  The UNC takes the form of \\server name\shared drive.  For example, a share of "c_drive" on a server called "Fred" could be referred to by its UNC name of "\\fred\c_drive".
Underflow When a calculation result is so small, so close to zero, that the computer can't represent it properly, you have underflow. The computer can then see this number as an error, or it can be programmed to round the number off so that work can proceed.
UNIX UNIX, which doesn't really stand for anything, is the most popular network operating system in the world, not to mention the operating system used to develop the Internet and World Wide Web. It's also a real favourite of the technological elite--not only because it's very capable but also because it's a deep, dark, intimidating mystery to the rest of us. You're never surer of your technical inadequacy than when you're peering over the shoulder of a UNIX programmer, watching her type lines of unintelligible code that only she and the computer understand.
Upload The act of transferring a file from your computer to the Internet (or a server).
UPS Acronym for Uninterruptible Power Supply. It is a device which has a battery and is used to supply 240VAC power to a computer or other electronic equipment during a power blackout. The UPS will automatically supply power when power is lost in such a way that the computer will continue to run for a typical period of 25-40 minutes in the hope that power will be restored before the battery is flat. Typically used with servers and essential network equipment.
UUNET UUNET is nothing less than the very first ISP. UUNET was created by Rick Adams, who was one of the original developers of ARPAnet, the nuclear-war-proof network that is now recognised as the precursor to the Internet. After a chain of mergers and acquisitions, UUNET is now an MCI company.


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This page was last updated on Sunday, 14 December 2008