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State and explain the types of Monitors.

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(1). Colour Graphics Adapter (CGA) display.
This was the original type of Monitor, but now it is obsolete.
It supported colour, but could only display a limited no. of colours. Usually, it supported 4 colours at a time.
It also ran at a low graphics resolution of 640 x 200 pixels.
(2). Enhanced Graphics Adapter (EGA) display.
It is a low-grade adapter. It was developed to improve the capabilities of CGA.
An EGA display works with a 9-pin connector and an EGA video card.
They have a resolution of 640 x 350 pixels, which is better than that of CGA monitors.
They also offer two brightness levels for each primary colour dot, thus, displaying a wider range of colours. EGA screens can show 16 different colours.
(3). Video Graphics Adapter (VGA) display.
It was introduced by IBM in 1987 for use on earlier IBM PS/2 systems. The VGA Video card contains all the circuitry needed to produce VGA graphics, and like all expansion cards, it plunges into a slot on the motherboard via an 8-bit interface.
VGA is able to display photographic quality images on a PC, i.e. it offers clean images at higher resolutions. It is able to build an image that is 640 x 480 pixels in size.
With a VGA, a PC has to deal with 640 x 480 x 3 bits every time a picture changes.
The standard VGA can produce about 256 colours at a time from a palette of 262,144 colours.
The VGA can also be used in Monochromes. It is able to translate colour graphics into graphics using 64 different shades of grey. This, in effect, simulates colour on a monochrome monitor.
VGA video card requires a VGA monitor, or a monitor capable of accepting the analog output of a VGA card.
(4). Super Video Graphics Adapter (SVGA) display.
SVGA is much more advanced than VGA.
In most cases, one SVGA card can produce millions of colours at a choice of resolutions. It is able to show 256 colours at a resolution of 1024 x 768 pixels.
SVGA is able to support 1024 x 768 x 3 bits potentially changing 50 times per second.

Kavungya answered the question on April 2, 2019 at 06:44

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State and explain the types of Monitors.

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