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The US Army asked Bell Laboratories to design a machine to help in testing its M-9 gun director, a kind of analog pc that aims giant weapons to their targets. Mathematician George Stibitz recommends using a relay-based calculator for the project. The end result was the Relay Interpolator, later referred to as the Bell Labs Model II. The Relay Interpolator used 440 relays , and since it was programmable by paper tape, was used for different applications following the warfare. Modern computer systems inherently comply with the ideas of the saved program laid out byJohn von Neumannin 1945. Essentially, this system is read by the pc one instruction at a time, an operation is performed, and the pc then reads the subsequent instruction. Computers are categorised based on computing energy, capability, dimension, mobility and different components, as personal computer systems , desktop computers, laptop computer computer systems, minicomputers, handheld computers and units, mainframes or sup...