The Electronic Delay Storage Automatic Calculator (EDSAC) was an early British computer. Inspired by John von Neumann's seminal First Draft of a Report on the EDVAC, the machine was constructed by Maurice Wilkes and his team at the University of Cambridge Mathematical Laboratory in England. EDSAC was the second electronic digital stored-program computer to go into regular service.
EDSAC I in June 1948
9-inch tubes used for monitoring
William Renwick with 5-hole tape reader and Creed teleprinter
Maurice Wilkes inspecting the mercury delay line of the EDSAC in construction
First Draft of a Report on the EDVAC
The First Draft of a Report on the EDVAC is an incomplete 101-page document written by John von Neumann and distributed on June 30, 1945 by Herman Goldstine, security officer on the classified ENIAC project. It contains the first published description of the logical design of a computer using the stored-program concept, which has come to be known as the von Neumann architecture; the name has become controversial due to von Neumann's failure to name other contributors.
Title page the First Draft, copy belonging to Samuel N. Alexander, who developed the SEAC computer based on the report.