History of Computers: The first generation of modern programmed electronic computers was built in 1947. This group included computers using Random Access Memory (RAM), which is a memory designed to give almost constant access to any particular piece of information.

Physically they were much smaller than the ENIAC. Some were about the size of a grand piano and used only 2,500 electron tubes. (The ENIAC needs over 18,000).

This group of computers included the EDVAC and UNIVAC, the first commercially available computers.