In the earliest computer systems, monitor output was very basic taking the form of flashing lights or simple displays of characters. Initially, monitors only displayed monochrome text, which was later improved to low resolution graphics with limited colours. Current monitors provide high resolution graphical displays with multiple colours.
When selecting a monitor the type of video card, or adaptor, in the system must match the manufacturer's list for compatibility so that the monitor performs at its best.
Current monitor standards are Video Graphics Array/Adaptor (VGA) or Super Video Graphics Array (SVGA). There are many variations of SVGA but typically involve more 16 colours and resolutions of 640 x 480 and upwards. This means that the screen is made up of 640 horizontal pixels (or picture elements) and 480 vertical pixels.
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