Invention of the Computer * ENIAC: Electronic Numerical Integrator and Computer * EDVAC: Electronic Discrete Variable Automatic Computer * EDSAC: Electronic Delay Storage Automatic Computer * UNIVAC: Universal Automatic Computer Computing began out of the necessity of performing calculations relating to the modelling of the nuclear reactions in the fission, and later fusion, bomb. By the 1970s fields such as chaos theory were made possible by the existence of large computers dedicated to scientific computing.