Maurice Wilkes's EDSAC, the First Easily Used Fully Functional Stored-Program Computer, Runs its First Program

On May 6, 1949 Maurice V. Wilkes’s EDSAC (Electronic delay storage automatic calculator) was fully operational at the University of Cambridge Computer Laboratory, and ran a program written by Wilkes for calculating a table of squares. It also ran a program written by David Wheeler for calculating a sequence of prime numbers. The EDSAC was the first easily used, fully functional stored-program computer to run a program. The phrase "delay storage" in its name reflected the delay-line memory used for storing the data and the program while processing.