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History of the Computer
How the Computer Evolved
• 1642 Blaise Pascal – mechanical adding machine
• Early 1800’s Jacquard – uses punch cards to control the pattern of the weaving loom
• 1832 Charles Babbage - invents the Difference Engine
• 1890 Herman Hollerith – invents a machine using punch card to tabulate info for the Census
Hollerith’s Tabulating Machine
Evolution (continued)
• 1910 Charles Watson Sr. – International Business Machines
• 1946 – Mauchly and Eckert created the ENIAC computer, first electronic computer is unveiled at U. of
Pennsylvania• 1970’s – Integrated circuits and
silicon chips lead to smaller microprocessors
ENIAC Computer• Miles of wiring• 18,000 vacuum tubes• Thousands of resistors and
switches• No monitor• 3,000 blinking lights• Cost $486,000• 100,000 additions per
second• Weighed 30 tons• Filled a 30x50 foot room• Could be replaced today by
one fingernail-size silicon chip