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system board
The main printed circuit board inside the system unit into which other
boards and major chip components, such as the system
microprocessor, are connected.
T
tpi
Tracks per inch.
track
Any of many concentric circular regions on a disk for storing data.
Tracks are divided into sectors. One measure of storage density of a
disk is tpi.
U
Ultra DMA
A protocol developed by Quantum Corporation and Intel that
supports burst mode data transfer rates of 33.3 MBps. This is twice as
fast as the previous disk drive standard for PCs, and is necessary to
take advantage of new, faster Ultra ATA disk drives. The official
name for the protocol is Ultra DMA/33.
USB
Universal Serial Bus. An external bus standard that supports data
transfer rates of 12 Mbps (12 million bits per second). A single USB
port can be used to connect up to 127 peripheral devices, such as
mice, modems, and keyboards. USB also supports Plug-and-Play
installation and hot plugging. It is expected to eventually replace
serial and parallel ports.
V
VESA
Video Electronics Standards Association. The source of a SuperVGA
standard used on many video boards.
20 Glossary
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