DISPLAY ADAPTOR
A computer and a Monitor without any video display card attached to it is of no use for us. A display adapter is a video card is a most for transferring data that is to be displayed on the screen, from the processor to the monitor.
Video add-on cards are available in the three basic group, the 8-bit, 16-bit, and the 32-bit. These terms referred to the amount of data that can be transferred at one single pass. A 16-bit card can send data to the monitor in the half time required by an 8-bit card.
1. Monochrome Display Adapter (MDA)
The original and simplest display combination in IBM monochrome display adapter and IBM monochrome display monitor introduce in 1981 by IBM. This adapter could display only text( No Graphics in One Color) at a resolution of 640 pixel with width by 350 pixel height. Because of it's clarity and high resolution, 640 x 350 pixel, it is the best suited for word processing work. Monochrome Monitor display clear and attractive characters.
2. Color Graphics Adapter (CGA)
The video adapter was also introduced by IBM, which provided low-resolution text and graphics. CGA Provided several different text and several including 40 or 80 columns by 25 line, 16 color text mode, and graphics modes of 640 horizontal pixels by 200 vertical pixels with 2 color, or 320 horizontal pixels with 4 colors.
3. Video Graphics Array (VGA)
VGA stands for Video Graphics array and it uses a special video chip to generate display. IBM, the producer of first such chip, uses a VLSI ( Very Large Scale Integration) chip comprising of a huge number of logic gate array to make video circuitary. VGA offers more graphics, more colors and highest resolution of any graphics adapter before it.
4. Super VGA
Super VGA refers to any enhancements to existing IBM VGA standard. The original standard set by VESA (Video Electronis Standards Association) was that of 800 x 600 resolution and 16 colors. However today cards are produced with 256 colors and even 1024 x 720 resolution. The number of colors on higher resolution increase in the newer graphics display standard like the Super VGA, the Extended Graphics Standard (XVG).
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