Babbage’s Difference Engine #2 Ed Lazowska Bill & Melinda Gates Chair in Computer Science & Engineering University of Washington August 2011.

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Presentation transcript:

Babbage’s Difference Engine #2 Ed Lazowska Bill & Melinda Gates Chair in Computer Science & Engineering University of Washington August 2011

z Need to tabulate polynomial functions y E.g., for trig tables z Concept proposed in 1822 y "Note on the application of machinery to the computation of astronomical and mathematical tables“ y Project terminated due to cost overruns z Analytical Engine described in 1837 z Difference Engine #2 designed

Crank-powered

Evaluates degree 7 polynomials

Prints the results (or makes plates)

11’ 7’ 8000 parts 5 tons

ENIAC: Electronic Numerical Integrator and Calculator (built ) 17,468 vacuum tubes 7,200 crystal diodes, 1,500 relays 70,000 resistors 10,000 capacitors 500,000 hand-soldered joints 8.5’ (h) x 3’ (d) x 80’ (linear) 30 tons 150 kW of power

IAS machine: von Neumann (built ) bit words of memory implemented using 40 Williams cathode ray tubes A stored program machine

z William Shockley, Walter Brattain and John Bardeen, Bell Labs The transistor (1947)

The integrated circuit (1958) z Jack Kilby, Texas Instruments, and Bob Noyce, Fairchild Semiconductor Corporation

Moore’s Law and exponential progress (1965-today) z Gordon Moore