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Eniac in ActionMaking and Remaking the Modern Computer$
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Thomas Haigh, Mark Priestley, and Crispin Rope

Print publication date: 2016

Print ISBN-13: 9780262033985

Published to MIT Press Scholarship Online: May 2017

DOI: 10.7551/mitpress/9780262033985.001.0001

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ENIAC Tries Its Luck

ENIAC Tries Its Luck

Chapter:
(p.193) 9 ENIAC Tries Its Luck
Source:
Eniac in Action
Author(s):

Thomas Haigh

Mark Priestley

Crispin Rope

Publisher:
The MIT Press
DOI:10.7551/mitpress/9780262033985.003.0010

As soon as Metropolis had completed the initial configuration of ENIAC for the new programming method, and before it was working properly, Klara von Neumann arrived to help. She had taken the leading role in converting the flow diagrams into program code, and together they worked around the clock for several weeks to get both program and machine into a usable state and to shuffle tens of thousands of cards in and out of it during Monte Carlo simulation of each exploding fission bomb. This chapter integrates the narrative of this initial “run,” of and a second batch of calculations carried out in late-1948 with analysis of the structure of the program itself. It finishes with an exploration of further Monte Carlo work run on ENIAC, including reactor simulations, simulation of uranium-hydride bombs, and in 1950 simulation of the “Super” concept for a hydrogen weapon.

Keywords:   Von Neumann, Klara, Von Neumann, John, Monte Carlo method, Los Alamos, Flow diagram, Nuclear fission

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