EDVAC Image taken originally from The Image Server (http://web.soi.city.ac.uk/archive/image/lists/computers.html) Javier Vega 2006

Index EDVAC Basics Creation The Creator The Designers EDVAC Functions EDVAC Building Components SIZE! EDVAC and ENIAC EDVAC Specifications EDVAC Timeline Von Neumann with the EDVAC Mauchly and Eckert Cost Works Cited

EDVAC Basics EDVAC stands for Electronic Discrete Variable Automatic Computer Binary System, not decimal like ENIAC Designed by Eckert and Mauchly, who were later joined by John Von Neumann

Creation The EDVAC was created by the University of Pennsylvania Built for the U.S. Army’s Ballistics research laboratory Design based on Von Neumannn’s 1945 report

The Creator John Von Neumann is recognized as the creator of EDVAC Born in Budapest in 1903 Wrote the first draft of the EDVAC in 1945

The Designers John Mauchly and J. Presper Eckert designed EDVAC basing it in the first draft of John Von Neumann Designed not only EDVAC but also ENIAC. Published EDVAC in 1947

EDVAC Functions Binary with automatic addition, subtraction, multiplication, programmed division Also automatic checking with a capacity of 1000 words

EDVAC Building Components Magnetic tape-reader-recorder Control unit with oscilloscope Dispatcher unit to receive instructions from the control and memory and direct them to other units Computational unit to perform arithmetic operations on a pair of numbers at a time and send the result to memory after checking on a duplicate unit Timer dual memory unit consisting of two sets of 64 mercury acoustic delay lines of eight words capacity on each line and also three temporary tanks each holding a single word

SIZE! 6,000 vacuum tubes 12,000 diodes Consumed 56kW of power Covered 45.5 m² of floor Weighed 7,850 kg.

EDVAC and ENIAC Main difference between ENIAC and EDVAC is this: EDVAC stores programs so that instructions did not have to be input repeatedly ENIAC did not store programs EDVAC is a continuation of ENIAC

EDVAC Specifications Programming and Numerical System Internal Number System Binary Binary Digits per Word 44 Binary Digits per Instruction 4 bits/command Instruction per word 1 Instructions Decoded 16 Instrtuctions used 12 Arithmetic System Floating and Fixed Point Instruction type Four-address code

EDVAC Timeline --------- 1944 1945 1946 1947 1952 1952, Completion of the EDVAC. 1945, John Von Neumann finishes the first draft of the EDVAC, it demonstrates the potential of the EDVAC. http://www.badpenguin.org/docs/lezione1/edvac.jpg April, 1946, Contract signed, the new device is called EDVAC, 100,000 dollars of budget. http://www-etsi2.ugr.es/alumnos/mlii/imagenes/edvac.jpg --------- 1944 1945 1946 1947 1952 November, 1944. John Von Neumann joins Mauchly and Eckert on the creation of the EDVAC. 1946, EDVAC was ready to be used but because of delays of the ending war, and the departure of workers to do civilian work. http://www.racine.ra.it/curba/rivoluzioni/informatica/1_generazione/APJ%20-%20ZOLI/Rivoluzione%20informatica/zoli/edvac.jpg

Von Neumann with the EDVAC John Von Neumann with the EDVAC http://www.scitech.mtesz.hu/10kiraly/kepek/icon/neumann_es_az_edvac.jpg

Mauchly and Eckert EDVAC designers, John Mauchly and Presper Eckert http://ei.cs.vt.edu/~history/50th/eck.mauch.jpg

Cost The EDVAC’s budget was about 100,000 dollars The cost at the end was of about 500,000 dollars

Works Cited EDVAC. October 11 2002, The History of Computing Project. 2 Oct. 2006. http://www.thocp.net/hardware/edvac.htm Lee, J.A.N. John Louis von Neumann. 1994. 4 Oct. 2006. http://ei.cs.vt.edu/~history/VonNeumann.html EDVAC. Biocrawler Online Encyclopedia. 6 Oct. 2006. http://www.biocrawler.com/encyclopedia/EDVAC The first stored program for a computer. American Philosophical Society (APS). 8 Oct. 2006. http://www.amphilsoc.org/library/exhibits/treasures/vonneuma.htm The First Electronic Computers. World Book Online. 10 Oct. 2006. http://www.worldbookonline.com/wb/Article?id=ar127860&st=edvac&sc=9