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Beyond VGA – Super VGA
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displayed and then the second half frame is displayed shifted so that its lines fit between the lines of
the first frame. This is called
interlace and it succeeds in lowering
the frame rate without increasing the
flicker – it is used quit successfully,
for example in broadcast TV pictures.
Unfortunately, as far
as computer video goes its effects are very poor. Because of the way that
computer graphics often use alternate lines, or patterns of lines to make
intermediate shades or colourss,
this use of interlace often produces a strong and very noticeable flashing. It is possible to arrange a demonstration of interlaced video
so that it looks acceptable by avoiding tones or colourss that use regular odd/even line patterns.
Equally, it is possible to find displays that
make and interlaced Super VGA is
tolerable as long as you avoid
even grey tones. Some applications
packages are even altering there colours scheme to avoid flicker on interlaced systems – Ventura 4 for
instance gives the user the option of
changing the grey surround
to an even colours to reduce
flicker.
Some Super VGA boards support non-interlaced monitors and
even increased vertical scan rates
up to 70Hz. Changing to a non-interlaced monitor makes the biggest
difference but a scan rate of 70Hz is
also worthwhile. Notice that to make use of non-interlaced high scan rate modes you need a video card and monitor that
supports them.
Beyond VGA – Super VGA
As VGA became the
accepted new standard, boards manufacturers first concentrated on building compatible
boards, then they turned their attention to expanding
on the capabilities of basic VGA.
The highest resolution supported by a VGA board is 640x480 in 16 colourss from a palette of
256. This is adequate for general work but
still higher resolution is
required for applications such
us DTP,
CAD and illustration. Even general applications working under Windows or OS/2 benefit from
resolutions above 640x480.
The need for these higher resolutions has resulted in the adoption of three additional standard
modes.
Ø 800
x 600 in 16 or 256 colourss
Ø 640
x 480 in 256 colourss
Ø 1024
x 768 in 16 or 256 colourss
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In additional to being able to
display 256 colourss these can be selected form a palette of over 250,000 colourss. Compared to the prattle of 16 colourss made available by other adapters this is an incredible number and it makes it
possible to produce very subtle colours changes.
If you find this discussion of video standard confusing
then the following table provides a summary. That is important however is
that VGA provides a standard that is
backward compatible with all of
the other video modes.
Resolution
|
Colourss
|
Palette
|
Adapter
|
320
x 200
|
2
|
16
|
CGA-EGA-VGA
|
320
x 200
|
16
|
16
|
EGA-VGA
|
320
x 200
|
256
|
256K
|
VGA
|
640
x 200
|
2
|
16
|
CGA-EGA-VGA
|
640
x 200
|
16
|
16/256K
|
EGA-VGA
|
640
x 200
|
4
|
64/256K
|
EGA-VGA
|
640
x 200
|
16
|
64/256K
|
EGA-VGA
|
640
x 200
|
2
|
256
|
VGA
|
640
x 200
|
16
|
256
|
VGA
|
720
x 348
|
2
|
2
|
HGA-EGA-VGA
|
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