Upper memory area – Dell PowerEdge 4400 User Manual
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Abbreviation for thin film transistor. A flat-panel display for notebook computers where each pixel is controlled by one to four transistors.
tpi
Abbreviation for tracks per inch.
TSR
Abbreviation for terminate-and-stay-resident. A TSR program runs "in the background." Most TSR programs implement a predefined key
combination (sometimes referred to as a "hot key") that allows you to activate the TSR program's interface while running another MS-DOS
program. When you finish using the TSR program, you can return to the other application program and leave the TSR program resident in memory
for later use.
Because MS-DOS is not designed to support multiple programs running simultaneously, TSR programs can sometimes cause memory conflicts.
When troubleshooting, rule out the possibility of such a conflict by rebooting your computer without starting any TSR programs.
TV
Abbreviation for television.
U
UL
Abbreviation for Underwriters Laboratories.
UMB
Abbreviation for upper memory blocks. See also
,
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
UPS
Abbreviation for uninterruptible power supply. A battery-powered unit that automatically supplies power to your computer in the event of an
electrical failure.
USB
Abbreviation for Universal Serial Bus.
USOC
Abbreviation for 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
Abbreviation for volt(s).
VAC
Abbreviation for volt(s) alternating current.
VCCI
Abbreviation for Voluntary Control Council for Interference.
VDC