video random-access memory definition hardware
(VRAM) Fast memory designed for storing the image to be displayed on a computer's monitor
. VRAM may be built from special memory integrated circuits
designed to be accessed sequentially.
VRAM must be fast enough to supply data to the display electronics at the speed at which the screen is scanned. Thus for example, for a resolution
of 1280x1024 eight-bit pixels
at a refresh rate
of 70 Hz, the video memory
would need to supply 1280x1024x70 = 90 Mbyte/s or one byte every 11 ns. The VRAM may be dual ported
in order to allow the display electronics and the CPU
to access it at the same time.
In an IBM PC
the VRAM is located on the display interface card and 0.5 - 2 MB is typical.
A VRAM Song (http://fweep.com/vram.html)!