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Glossary 15
WSL
Abbreviation for tracks per inch.
765
Abbreviation for terminate-and-stay-
resident. A TSR program runs “in the
background.” Most TSR programs imple-
ment a predefined key combination
(sometimes referred to as a “hot key”)
that allows you to activate the TSR pro-
gram’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 simul-
taneously, TSR programs can sometimes
cause memory conflicts. When trouble-
shooting, rule out the possibility of such a
conflict by rebooting your computer with-
out starting any TSR programs.
79
Abbreviation for television.
8/
Abbreviation for Underwriters
Laboratories.
80%
Abbreviation for upper memory blocks.
See also conventional memory, HMA,
memory manager, and upper memory
area.
XSSHUPHPRU\DUHD
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.
836
Abbreviation for uninterruptible power
supply. A battery-powered unit that
automatically supplies power to your
computer in the event of an electrical
failure.
862&
Abbreviation for Universal Service Order-
ing Code.
XWLO LW \
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 ex-
tended memory are utilities included in
MS-DOS.
9
Abbreviation for volt(s).
9$&
Abbreviation for volt(s) alternating
current.
9&&,
Abbreviation for Voluntary Control Council
for Interference.
9'&
Abbreviation for volt(s) direct current.
9'(
Abbreviation for
Verband Deutscher
Elektrotechniker
.
9'6
Abbreviation for Virtual Direct Memory
Access Services.
9(6$
Acronym for Video Electronics Standards
Association.
9*$
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.