EDSAC
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 | |
| Developer | Maurice Wilkes and his team at the University of Cambridge Mathematical Laboratory |
|---|---|
| Manufacturer | University of Cambridge |
| Generation | 1 |
| Release date | 6 May 1949 |
| Lifespan | 1949–1958 |
| Discontinued | yes |
| Units shipped | 1 |
| Operating system | None |
| CPU | Derated thermionic valves |
| Memory | 512 17-bit words, upgraded in 1952 to 1024 17-bit words (temperature-stabilized mercury delay lines) |
| Display | Teleprinter |
| Input | five-hole punched tape |
| Power | 11 kW |
| Backward compatibility | None |
| Successor | EDSAC 2 and LEO I |
| Related | EDVAC |
Later the project was supported by J. Lyons & Co. Ltd., intending to develop a commercially applied computer and succeeding in Lyons' development of LEO I, based on the EDSAC design. Work on EDSAC started during 1947, and it ran its first programs on 6 May 1949, when it calculated a table of square numbers and a list of prime numbers. EDSAC was finally shut down on 11 July 1958, having been superseded by EDSAC 2, which remained in use until 1965.