Memory access modes for a video display generator

Abstract From the Canadian patent

A display memory which stores information to be displayed on a raster scan CRT comprises a first storage element for storing dot information a second, storage element for storing behavior information and a, third storage element for storing characteristic information. The first, second, and third storage element are each arranged in an nxm plane where m is an addressable location and each addressable location within each plane has n bits of information. Further each of the first, second, and third storage elements has address terminals each operatively connected to a display address bus adapted to receive address information from a CPU. Control logic receives address signals data, signals, …