The Harvard Mark IV was an electronic stored-program computer built by Harvard University under the supervision of Howard Aiken for the United States Air Force. The computer was finished being built in 1952. It stayed at Harvard, where the Air Force used it extensively.
The Mark IV was all electronic. The Mark IV used magnetic drum and had 200 registers of ferrite magnetic-core memory (one of the first computers to do so). It separated the storage of data and instructions in what is now sometimes referred to as the Harvard architecture although that term was not coined until the 1970s (in the context of microcontrollers).
See also
Harvard Mark I
Harvard Mark II
Harvard Mark III
List of vacuum-tube computers
Howard Aiken
Harvard (World War II advanced trainer aircraft)
References
Further reading
A History of Computing Technology, Michael R. Williams, 1997, IEEE Computer Society Press,