U
Ultra High Frequency. (1) A bonded-wafer process technology
used in Melbourne, Fla. for fabrication of enhanced bipolar products, particularly linear
and high-frequency operational amplifiers and other linear products. (2) Also, the
portion of the radio spectrum between 300 and 3000 megahertz (MHz). This includes
television channels 14 through 83, as well as most radar use.
An operating system developed at AT&T Bell Labs by Ken Thompson and Dennis Ritchie,
and further extended at the University of California, Berkeley, by a number of students,
including Bill Joy, one of the founders of Sun Computers. The key feature of Unix is that
while all versions of Unix are not the same, it is an open architecture and not
proprietary to any hardware vendor. This means that application programs are more easily
ported between different versions of Unix than between any other proprietary operating
systems. See open architecture.
