Dell PowerEdge 6400 - Manual (Page 28)

U
UL
Underwriters Laboratories
UMB
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 software 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 memory manager .
UPS
Uninterruptible power supply. A battery-powered unit that automatically supplies power to your computer in the event of an electrical failure.
USOC
Universal Service Ordering Code
utility
A program used to manage system resources —memory, disk drives, or printers, for example. The diskcopy command for duplicating diskettes
and the himem.sys device driver for managing extended memory are utilities included in MS-DOS.
V
V
volt(s)
VAC
volt(s) alternating current
VCCI
Voluntary Control Council for Interference
VDC
volt(s) direct current
VDE
Verband Deutscher Elektrotechniker
VDS
Virtual Direct Memory Access Services
VESA ®
Video Electronics Standards Association
VGA
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 resolution, you must install the appropriate video drivers and your monitor must support the resolution. Similarly,
the number of colors that a program can display depends on the capabilities of the monitor, the video driver, and the amount of memory 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 adapter, such as a video
accelerator, to your computer. A VGA feature connector can also be called a VGA pass-through connector.