Short for Electronic Delay Storage Automatic Calculator, EDSAC is an early British computer considered to be the second stored program electronic computer, after the SSEM. It was created at the University of Cambridge in England, performed its first calculation on May 6, 1949. It also has the distinction of being the first computer to run a graphical computer game, an implementation of tic-tac-toe named "OXO." Pictured at right is an example of the EDSAC computer.
The picture below is an example of the Edsac emulator that can be run on today's computers. The simulator simulates the EDSAC computer as it existed between 1949-1951.