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 capability).
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-
disk drive. For example, in a computer with 16 MB of RAM and 16 MB of virtual
memory set up on the hard-
disk drive, the operating system would manage the system as though it had 32 MB of physical RAM.
virus
A self-starting program designed to inconvenience you. Virus programs have been known to corrupt the files stored on a hard-disk drive or to
replicate themselves until a system or network runs out of memory.
The most common way that virus programs move from one system to another is via "infected" diskettes, from which they copy themselves to the
hard-disk drive. To guard against virus programs, you should do the following:
l
Periodically run a virus-checking utility on your computer's hard-disk drive.
l
Always run a virus-checking utility on any diskettes (including commercially sold software) before using them.
VLSI
very-large-scale integration
Vpp
peak-point voltage
VRAM
video random-access memory. Some video adapters use VRAM chips (or a combination of VRAM and DRAM) to improve video performance.
VRAM is dual-ported, allowing the video adapter to update the screen and receive new image data at the same time.
W
W
watt(s)
WH
watt-hour(s)
win.ini
file
A start-up file for the Windows operating system. When you start Windows, it consults the
win.ini
file to determine a variety of options for the
Windows operating environment. Among other things, the
win.ini
file records what printer(s) and fonts are installed for Windows. The
win.ini
file
also usually includes sections that contain optional settings for Windows application programs that are installed on the hard-disk drive.
Revising the
Control Panel
settings or running the Windows Setup program may change options in the
win.ini
file. On other occasions, you may
need to change or add options to the
win.ini
file manually with a text editor such as Notepad.
Windows 95
An integrated and complete Microsoft Windows operating system that does not require MS-DOS and the provides advanced operating system
performance, improved ease of use, enhanced workgroup functionality, and simplified file management and browsing.
Windows NT
High-performance server and workstation operating system software developed by Microsoft that is intended for technical, engineering, and
financial applications.
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