04070710 is referenced by 117 patents and cites 12 patents.

A computer graphics display system including random access raster memory for storing data to be displayed, a raster memory control unit for writing data into the raster memory, a video control unit for causing such information to be displayed on a CRT display screen, a micro control unit for controlling the function and timing of the raster memory control unit and the video control unit, and a computer adapter for facilitating data exchange between the micro control unit and a host computer. The displayed image can have extremely high complexity with essentially no problem of display flicker. Zoom and pan features allow the use of a very complex stored image in a flexible manner, and a split-screen technique enables an operator to work on a very complex picture at a detail level while still having an overview of the total picture, or any portion thereof, simultaneously presented before him. The split-screen feature also allows the simultaneous display of alphanumeric messages such as prompts, menus, or X-Y readouts added to the graphics display and a small area of the raster memory is usually reserved for this purpose. An XOR feature allows a selective erase that restores lines crossing or concurrent with erased lines. The XOR feature permits part of the drawing to be moved or "dragged" into place without erasing other parts of the drawing.

Title
Raster scan display apparatus for dynamically viewing image elements stored in a random access memory array
Application Number
5/650372
Publication Number
4070710
Application Date
January 19, 1976
Publication Date
January 24, 1978
Inventor
Greg J Tilden
San Jose
CA, US
Josef S Sukonick
Cupertino
CA, US
Agent
Boone Schatzel Hamrick & Knudsen
Assignee
Nugraphics
CA, US
IPC
G06F 3/14
View Original Source