Alan Turing (British mathematician) was the first to imagine a machine that could compute any problem that was presented in a set of (General Purpose Computer). Konrad Zuse built a series of machines for his calculations. His Z3 was the earliest fully functioning program-controlled machine.

The ENIAC was the first computer controlled by a program. (Built by American physicist John Mauchly and engineer Presper Eckert.) It was faster than earlier machines but had no memory to store programs!

On June 21st, 1948, the Manchester Baby ran a program from .

A patent for the computer has never been awarded!