Computers used in space transportation system, aircraft or spacecraft. For aircraft the staring wheel with cables connected to the pilot controls, which is located in the control surface. NASA said that “shuttle contains a fully fly-by-wire avionics system”. Which means that all the electrical connection are directed through a computer. Spacecraft are more autonomy, which mean everything is done on the surface and also it is monitored by the board. The main engines of the shuttle is not assisted by the main computer and only before the use of performance improved. NASA has used the avionics method since the 1950s and during that time of period they had replaced the mechanical/analog equipment to digital devices.