Patent US 3,980,994

A natural language text editing and display system having a central processing unit, a memory unit, and an input keyboard terminal. Display characters are selectively inserted into the text stored in the memory unit by actuating an insert key at the keyboard, positioning a cursor at the desired location on the display and actuating a key corresponding to a character to be inserted at that location. The terminal generates a character word having a character code corresponding to the selected display character and an insert code. The insert code identifies the associated character word as one to be inserted by the processing unit at the cursor location.