video memory

    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.

   (1996-11-01)