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The Atanasoff-Berry Computer represented several innovations in computing, including a binary system of arithmetic, parallel processing, regenerative memory, and a separation of memory and computing functions. There are three basic types of mice. mechanical: Has a rubber or metal ball on its underside that can roll in all directions. Mechanical sensors within the mouse detect the direction the ball is rolling and move the screen pointer accordingly. The first user interfaces to computers were not graphical or visually oriented; they were all text and keyboard commands. MS-DOS is an example of a text and keyboard method of computer control that you can still find on many PCs today.