Mark Iii

Mark Iii

Harvard Mark III

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The Harvard Mark III, also known as ADEC (for Aiken Dahlgren Electronic Calculator) was an the first computers that are part of electronic and electromechanical part. It was built at Harvard University under the supervision of Howard Aiken for the Navy U.S..
Word of the Mark III was thirty-six bits, storage of sixteen decimal digits plus a sign. It used 5000 vacuum tubes and 1,500 crystal diodes. He used magnetic drum memory of 4,350 words. Its addition time was 4400 microseconds and the multiplication time was 13,200 microseconds (times includes the memory access time). Aiken boasted that the Mark III was the fastest electronic computer in the world.
The Mark III uses nine magnetic battery (One of the first computers to do so). A drum can hold 4000 instructions and has an access time of 4.400 microseconds, so it was a computer program stored. The calculator could have access to other content two drums 150 words of constants and other variables contained 200 words. Both of these drums also had an access time of 4.400 microseconds. This separation of data and instructions is known as the Harvard architecture. There were six other drums containing a total 4,000 words of data, but the arithmetic unit could not access these drums directly. Data had to be moved between the drums and the drum of the arithmetic unit could access through registers implemented by electromechanical relays. This was a bottleneck in the computer and made the access time to data on these drums 80,000 microseconds long. This was offset in part by the fact that twenty words could be transferred in each access.
The Mark III was completed in September 1949 and delivered to the U.S. Naval Proving Ground in the U.S. Navy base in Dahlgren, Virginia, in March 1950.
References
A History of Information Technology, Michael R. Williams, 1997, IEEE Computer Society Press, ISBN 0-8186-7739-2
See also
Harvard Mark I
Harvard Mark II
Harvard Mark IV
Howard Aiken
External Links
BRL Report 1955 – see ADEC
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