Describe the features of Video controller
Describe the features of Video controller?
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• A fixed area of the system memory is reserved for the frame buffer and to the frame-buffer memory the video controller is given access
• To store the coordinates of the screen pixels Tow registers are used.
• The value is stored in the frame buffer for this pixel position is then retrieved and used to set the intensity of the CRT beam
• Initially the x register is set to 0 and they register is set to y-max
• Then the x register is incremented by 1 whereas process repeated for next pixel on top scan line
• This process is repeated for each pixel along the scan line
• After the last pixels on the top scan line have been developed x register reset to 0 where as y register is decremented by 1.
• From each successive line the procedure is repeated.
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