This resource discusses the contribution of Charles Babbage and topics like difference engine, Analytic Engine, Babbage?s influence, Harvard Mark I, linear equation solver, electronic numerical integrator and computer (ENIAC), electronic discrete variable automatic computer (EDVAC), stored program computer, technology issues, the spread of ideas, dominant problem: reliability, commercial activity: 1948-52, IBM 701, software developments, factors that influence computer architecture, microprocessors economics, compatibility, and perpetual tension.