<P> In 1936 Konrad Zuse anticipated in two patent applications that machine instructions could be stored in the same storage used for data . </P> <P> The University of Manchester's Manchester Small - Scale Experimental Machine (SSEM) is generally recognized as world's first electronic computer that ran a stored program--an event that occurred on 21 June 1948 . However the SSEM was not regarded as a full - fledged computer, but more a proof of concept predecessor to the Manchester Mark 1 computer, which was first put to research work in April 1949 . On 6 May 1949 the EDSAC in Cambridge ran its first program, making it arguably "the first complete and fully operational regular electronic digital stored - program computer". It is sometimes claimed that the IBM SSEC, operational in January 1948, was the first stored - program computer; this claim is controversial, not least because of the hierarchical memory system of the SSEC, and because some aspects of its operations, like access to relays or tape drives, were determined by plugging . The first stored - program computer to be built in continental Europe was the MESM, completed in the Soviet Union in 1951 . </P> <P> Several computers could be considered the first stored - program computer, depending on the criteria . </P> <Ul> <Li> ARC2, developed by Andrew Booth and Kathleen Booth at Birkbeck, University of London, officially came online on May 12, 1948 . It featured the first rotating drum storage device . </Li> <Li> Manchester Small - Scale Experimental Machine, an experimental computer that successfully ran a stored program on June 21, 1948 . It was subsequently developed into the Manchester Mark 1, which ran its first program in early April 1949 . </Li> <Li> Electronic delay storage automatic calculator, which became fully operational providing a service to a range of customers on May 6, 1949 . </Li> <Li> EDVAC, conceived in 1945 but not delivered until August 1949 . </Li> <Li> BINAC, delivered to a customer on August 22, 1949 . It worked at the factory but there is disagreement about whether or not it worked satisfactorily after being delivered . If it had been finished at the projected time, it would have been the first stored - program computer in the world . It was the first stored - program computer in the U.S. </Li> <Li> ETL Mark III, which began development in 1954 and was completed in 1956, was the first stored - program transistor computer . It was created by Japan's Electrotechnical Laboratory . </Li> </Ul>

Where are programs stored when they are not in the process of running