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.
