User's Manual
Glossary 261
video driver
A program that allows graphics-mode application programs and operating systems
to display at a chosen resolution with the desired number of colors. A software
package may include some “generic” video drivers. Any additional video drivers
may need to match the video adapter installed in the computer.
video memory
Most VGA and SVGA video adapters include memory chips in addition to your
computer's RAM. The amount of video memory installed primarily influences the
number of colors that a program can display (with the appropriate video drivers
and monitor capabilities).
video mode
Video adapters normally support multiple text and graphics display modes.
Character-based software displays in text modes that can be defined as
x
columns
by
y
rows of characters. Graphics-based software displays in graphics modes that
can be defined as
x
horizontal by
y
vertical pixels by
z
colors.
video resolution
Video resolution—800 x 600, for example—is expressed as the number of pixels
across by the number of pixels up and down. To display a program at a specific
graphics resolution, you must install the appropriate video drivers and your
monitor must support the resolution.
virtual memory
A method for increasing addressable RAM by using the hard drive. For example,
in a computer with 16 MB of RAM and 16 MB of virtual memory set up on the
hard drive, the operating system would manage the system as though it had 32 MB
of physical RAM.
virus
A self-starting program designed to cause inconvenience. Virus programs have
been known to corrupt the files stored on a hard drive or to replicate themselves
until a computer or network runs out of memory.
The most common way that virus programs move from one computer to another
is through “infected” diskettes, from which they copy themselves to the hard
drive. To guard against virus programs, do the following:
• Periodically run a virus-checking utility on your computer's hard drive
• Always run a virus-checking utility on any diskettes (including commercially sold
software) before using them