Dual-ported RAM

Dual-ported RAM (DPRAM) is a type of random-access memory that allows multiple reads or writes to occur at the same time, or nearly the same time, unlike single-ported RAM which only allows one access at a time.

Video RAM or VRAM is a common form of dual-ported dynamic RAM mostly used for video memory, allowing the CPU to draw the image at the same time the video hardware is reading it out to the screen.