Users Guide

16 Dell PowerEdge 2400 Systems User’s Guide
TV
Abbreviation for television.
UL
Abbreviation for Underwriters
Laboratories.
UMB
Abbreviation for upper memory blocks.
See also conventional memory, HMA,
memory manager, and upper memory
area.
upper memory area
The 384 KB of RAM located between
640 KB and 1 MB. If the computer has an
Intel386 or higher microprocessor, a soft-
ware utility called a memory manager can
create UMBs in the upper memory area,
in which you can load device drivers and
memory-resident programs. See also
conventional memory, HMA, and memo-
ry manager.
UPS
Abbreviation for uninterruptible power
supply. A battery-powered unit that auto
-
matically supplies power to your
computer in the event of an electrical
failure.
USB
Abbreviation for Universal Serial Bus.
USOC
Abbreviation for Universal Service Order-
ing Code.
utility
A program used to manage system re-
sources—memory, disk drives, or
printers, for example. The diskcopy com
-
mand for duplicating diskettes and the
himem.sys device driver for managing
extended memory are utilities included in
MS-DOS.
V
Abbreviation for volt(s).
VAC
Abbreviation for volt(s) alternating
current.
VCCI
Abbreviation for Voluntary Control Council
for Interference.
VDC
Abbreviation for volt(s) direct current.
VDE
Abbreviation for Verband Deutscher
Elektrotechniker.
VESA
®
Acronym for Video Electronics Standards
Association.
VGA
Abbreviation for video graphics array. VGA
and SVGA are video standards for video
adapters with greater resolution and color
display capabilities than EGA and CGA,
the previous standards.
To display a program at a specific resolu-
tion, you must install the appropriate
video drivers and your monitor must sup
-
port the resolution. Similarly, the number
of colors that a program can display de
-
pends on the capabilities of the monitor,
the video driver, and the amount of mem
-
ory installed for the video adapter.
VGA feature connector
On some systems with an integrated VGA
video adapter, a VGA feature connector
allows you to add an enhancement adapt-
er, such as a video accelerator, to your
computer. A VGA feature connector can
also be called a VGA pass-through
connector.
video adapter
The logical circuitry that provides—in
combination with the monitor or display—
your computer's video capabilities. A
video adapter may support more or fewer
features than a specific monitor offers.
Typically, a video adapter comes with
video drivers for displaying popular appli
-
cation programs and operating
environments in a variety of video modes.
On most current Dell computers, a video
adapter is integrated into the system
board. Also available are many video