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Ultra SCSI - see SCSI

Ultra Wide SCSI -see SCSI

Ultra2 SCSI - see SCSI

UNIVAC I - The first commercially available electronic computer, designed by J.Presper Eckert and John Mauchly, also the inventors of ENIAC (generally considered the first fully electronic computer). UNIVAC I was the first computer to handle both numeric and textual information. Control of their corporation, passed in 1951 to Remington Rand, who delivered the first machine to the U.S. Bureau of the Census in March 1951.

UNIX - Pronounced “ewe-niks.” A multi-user, multitasking operating system originally developed by Ken Thompson and Dennis Ritchie at AT&T Bell Laboratories in 1969 for use on minicomputers. UNIX exists in various forms and implementations; among these are versions released by AT&T, the most recent being AT&T System V. UNIX is considered a powerful operating system that, because it is written in the C language, is more portable – that is, less machine – specific – than other operating systems. UNIX is available in several related forms, including ALX, a version of UNIX adapted by IBM (to fun on RISC-based workstations), A/UX (a graphical version for the Apple Macintosh), and Mach (a rewritten but essentially UNIX-compatible operating system for the Next computer).

USB - Universal Serial Bus

User-Defined Data Type - A data type defined in a program. User-defined data types are usually combinations of data types defined by the programming language being used and are often used to create data structures.

UUCP - Abbreviation for UNIX-to-UNIX Copy. A set of software programs that facilitate transmission of information between UNIX systems using serial data connections, primarily the public switched telephone network.