HRM 3450 Lecture Notes - Lecture 33: Self-Replicating Machine, Binary Number, Eniac
5 May 2018
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HRM 3450 Lecture 33 Notes – ENIAC
Introduction
• ENIAC operated successfully until 1955, when it was dismantled, but not destroyed.
• Parts of the computer can be seen at the Smithsonian Institute, at the U.S. Military
Academy at West Point, at the Moore School of the University of Pennsylvania, and at
the University of Michigan.
• In 1945, John von Neumann, a consultant on the ENIAC project, proposed a computer
that included a number of significant improvements over the ENIAC design.
• A memory that would hold programs and data, the so-called stored program concept.
• This solved the difficult problem of rewiring the control panels for changing programs
on the ENIAC.
• Binary processing of data.
• This simplified the design of the computer and allowed the use of binary memory for
both instructions and data.
• It also recognized the natural relationship between the ON/OFF nature of switches and
calculation in the binary number system, using Boolean logic.
• The CPU was to include ALU, memory, and CU components.
• The control unit read instructions from memory and executed them.
• A method of handling input/output through the control unit was also established.
• The instruction set contained instructions representing all the essential features of a
modern computer.
• I other ords, o Neua’s ahie otaied eery ajor feature osidered
essential to modern computer architecture.
• Modern computer architecture is still referred to as von Neumann architecture.
• Due to politial itrigue ad otroersy, to differet ersios of o Neua’s
architecture were designed and built, EDVAC at the University of Pennsylvania and IAS
at the Princeton University Institute for Advanced Studies (hence the unusual name).
• Both machines were completed in 1951–1952.
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