EDSAC

The EDSAC was the world’s first stored-program computer to operate a regular computing service. Designed and built at Cambridge University, the EDSAC performed its first fully automatic calculation on 6 May 1949. The Warwick
University simulator is a faithful emulation of the EDSAC designed to run on a personal computer. The user interface has all the controls and displays of the original machine, and the system includes a library of original programs, subroutines, debugging software, and program documentation

EDSAC 2 was a successor to the Electronic Delay Storage Automatic Calculator. It was the first computer to have a microprogrammed control unit and a bit slice hardware architecture and was introduced early in 1958