Epson CW3S16 Operation Manual page 153

The personal computer industry has established several video
controller resolution and color standards. Some of these are
described below.
– Hercules Graphics Compatible (HGC):
HGC boards have become the video controller-of-choice
for basic personal computer video display monitor systems.
Providing dot resolutions up to 720x350, HGC boards
display good quality text and graphics, while using
shading to accommodate color software.
– Color Graphics Adaptor (CGA):
The original CGA boards featured very low resolution,
typically 320x200. This was because they were originally
intended home computers that were used for advanced
video games. Recently, however, CGA resolution has
been improved to 640x200. With the higher resolution,
CGA has gained acceptance in the office environment.
By using colored text screens and low-level graphics, a
number of software packages have been made easier to
use.
– Enhanced Graphics Adaptor (EGA):
EGA video systems provide high resolution (640 X 350
maximum) color graphics capabilities. These monitor
systems are often used in computer-aideddesign
workstations and other software applications requiring a
larger number of on-screen colors than CGA controllers
can provide.
– Video Graphics Array (VGA):
Recently, a new video standard has emerged to take
advantage of the features of the multi-sync monitors.
Providing up to 720x400 dot resolution, these systems
have been used in applications that require the highest
possible video resolution, such as desktop publishing,
computer-aided-design (CAD/CAE), and broadcast quality
computer graphics.
C-2 Video Monitor
Systems