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CHAPTER 2: Introduction
2.1.2 VGA
VGA, the primary display device
supported by PCs is by far the best
display media on the low-end PC
graphics market. It possesses gray-
level capabilities and circuits for
displaying real-world images instead
of artificial computer graphics. The
standard VGA can be operated in
320 x 200 resolution, 256 colors/64
gray scale and 640 x 480 resolution,
256 colors.
VGA Compared to TV
:
• Horizontal frequency
- VGA: 31.5 KHz
- TV: 15.7 KHz
• Vertical frequency
- VGA: 70.0 KHz
- TV: 60.0 KHz
• Interlace vs. Non-Interlace
- VGA: Non-Interlace
- TV: Interlace
You can see from the information
above that the image quality of VGA
is superior to TV quality.
2.2 Hotkeys and TSR Programs
Programs such as SideKick
®
or DOS
graphic execution files are executed
and kept in a PC’s RAM or Random
Access Memory. This means once
they are activated, they are stored in
memory for instant use when
needed. This type of program is
called a TSR (Terminate and Stay
Resident) Program. A TSR allows
you to activate the program with a
hotkey. A hotkey is a sequence of
keystrokes or combination of
keystrokes that when touched
activate the program.
The VGA to TV—Portable Plus
provides a TSR program. Once the
program is installed, you can bring
up the display switch functions by
pressing the predefined hotkey.
2.3 VGA to Video—Portable Plus
The VGA to Video—Portable Plus
works as an interface between the
VGA signals of your PC and the
video signal that your TV accepts.
The VGA to Video—Portable Plus
converts the VGA signal to standard
TV (NTSC) signal. The VGA to
Video—Portable Plus consists of two
parts:
• VGA to Video—Portable Plus
Encoder Box
• VGA to Video—Portable Plus
“flicfree” software
