Computer Evolution And Performance

ENIAC - background

•Electronic Numerical Integrator And Computer

•Eckert and Mauchly

•University of Pennsylvania

•Trajectory tables for weapons

•Started 1943

•Finished 1946

—Too late for war effort

•Used until 1955

ENIAC - details

•Decimal (not binary)

•20 accumulators of 10 digits

•Programmed manually by switches

•18,000 vacuum tubes

•30 tons

•15,000 square feet

•140 kW power consumption

•5,000 additions per second

von Neumann/Turing

•Stored Program concept

•Main memory storing programs and data

•ALU operating on binary data

•Control unit interpreting instructions from memory and executing

•Input and output equipment operated by control unit

•Princeton Institute for Advanced Studies

—IAS

•Completed 1952

Structure of von Neumann machine

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