The Analytical and Difference Engines (1835-1869): The English mathematician Charles Babbage (1792-1871) never got to build his invention, but his design had an uncanny resemblance to the modern computer. Ada Lovelace, Lord Byron's daughter, wrote eloquently about the device and was history's first programmer.The ABC (Atanasoff Berry Computer) (1938): John Atanasoff and Clifford Berry designed the first electronic digital computer at Iowa State, and urged the university to patent their design. Nothing was ever done and millions in potential royalties were lost. The project was abandoned in 1942 without building the computer.The ENIAC (Electronic Numerical Integrator and Calculator) (1946): was built at the University of Pennsylvania by John W. Mauchly and J. Presper Eckert. Recognized as the first operational electronic computer, it could perform 5,000 additions per second, weighed 30 tons, and required 1,500 square feet of floor space.UNIVAC I (Universal Automatic Computer) (1951): The world's first commercial computer (a total of 15 were sold) gained public recognition when it was used by CBS to predict Eisenhower's 1952 presidential election. The original UNIVAC was officially retired on October 3, 1963, after 73,000 hours of operation, and is now on display at the Smithsonian Institution.The IBM 360 (1964): The 360 series pioneered the concept of upward compatibility whereby a user could upgrade from one computer to the next without having to reprogram existing applications. The machine was viewed as an enormous financial gamble, but paid off handsomely as it gave IBM a dominance in mainframes which it has never relinquished.Altair 8800 (1975): The January 1975 issue of Popular Electronics featured the Altair 8800 on its cover: the first personal computer and a machine that the hobbyist could build from a kit. 2000 adventurous readers sent in their orders (sight unseen) for a kit that cost $439. The Altair had no keyboard or monit...
