A video memory and display (CRT) controller circuit on a single semiconductor substrate controls a DRAM (dynamic random access memory) used as a video memory and a CRT display. The video memory and display controller is normally a part of a video system which includes a data processor, video memory and...http://www.google.ca/patents/US4665495?utm_source=gb-gplus-sharePatent US4665495 - Single chip dram controller and CRT controller
