video memory

<storage> The memory in a computer's graphics adaptor, used to store the image displayed on a bitmap display. Often this is built using VRAM chips. There is normally a simple correspondence between groups of bits in video memory and the dots or "pixels" on the screen, such that writing to a given group of bits will alter the appearance of a single dot. If each pixel corresponds to eight bits then it can have any of 256 colours (or shades of grey on a monochrome display).

The video display electronics is responsible for reading the data from video memory and converting it into the necessary signals to drive the display. Often this includes a colour palette which converts pixel values into RGB triplets.

Last updated: 1996-11-01

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Nearby terms: Video Graphics Adapter « Video Graphics Adaptor « Video Graphics Array « video memory » Video on Demand » video RAM » video random-access memory


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Copyright Denis Howe 1985

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