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Macintosh Edsac Simulator
The EDSAC was the world’s first practical stored-program computer; it was designed and built at Cambridge University, and performed its first fully automatic calculation on 6 May 1949. The Warwick University simulator is a faithful representation of the EDSAC designed to run on the Macintosh computer.
The user interface has all the controls and displays of the original machine, and the system includes a library of original programs, subroutines, debugging software, and program documentation. This report includes a description of the EDSAC and an account of the seminal programming techniques developed for it during 1949-51.
Several demonstration programs and programming problems are supplied, so that users can gain first-hand experience of what it was like to develop and run a program on a first-generation computer. 
Fault Reports

1     A conflict has been reported on some Macintosh models between the Edsac simulator and the System 7.5 "Macintosh Easy Open" control panel. The simulator quits with the alert "The application 'unknown' has unexpectedly quit, because an error of type 1 occurred." 
        Either disabling the control panel, or setting the "Automatic document translation" radio button to "Off ", appears to prevent the problem.

Martin Campbell-Kelly - - 26 January 1996