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This document provides a brief history of early computing devices and computers. It describes the abacus, developed 5000 years ago to perform simple math, and Napier's Bones, a 17th century calculating device. It also discusses early mechanical calculators invented by Pascal and Leibniz. The document then outlines important early electronic computers including ENIAC, the first general-purpose electronic computer; EDVAC, which could store instructions and data; and UNIVAC, the first computer used for commercial applications.