The IAS machine was the first electronic computer built at the Institute for Advanced Study (IAS), in Princeton, New Jersey, USA. It is sometimes called the von Neuman machine, since the paper describing its design was edited by John von Neumann, a mathematics professor at both Princeton University and IAS. The computer was built from late 1945 until 1951 under his direction.[1] The general organization is called Von Neumann architecture, even though it was both originated and implemented by others.[2]
History
Julian Bigelow was hired as chief engineer in May 1946.[3] Hewitt Crane, Herman Goldstine, Gerald Estrin and Arthur Burks also worked on the project.[4] The machine was in limited operation in the summer of 1951 and fully operational on June 10, 1952.[citation needed]
It was in operation until July 15, 1958.[5]
Description
The IAS machine was a binary computer with a 40 bit word, storing two 20 bit instructions in each word. The memory was 1024 words (5.1 kilobytes). Negative numbers were represented in "two's complement" format. It had two general-purpose registers available: the Accumulator (AC) and Multiplier/Quotient (MQ).
Although some claim the IAS machine was the first design to mix programs and data in a single memory, that had been implemented four years earlier by the 1948 Manchester Small Scale Experimental Machine.[6]
Von Neumann showed how the combination of instructions and data in one memory could be used to implement loops, by modifying branch instructions when a loop was completed, for example. The resultant demand that instructions and data be placed on the memory later came to be known as the Von Neumann Bottleneck.
While the original design called for using a type of vacuum tubes called RCA Selectron tubes for the memory, problems with the development of these complex tubes forced the switch to Williams tubes. Nevertheless, it used about 2300 tubes in its circuitry. The addition time was 62 microseconds and the multiplication time was 713 microseconds. It was an asynchronous machine, meaning that there was no central clock regulating the timing of the instructions. One instruction started executing when the previous one finished.
IAS machine derivatives
Plans for the IAS machine were widely distributed to any schools, businesses, or companies interested in computing machines, resulting in the construction of several derivative computers referred to as "IAS machines," although they were not software compatible in the modern sense.[4]
Some of these "IAS machines" were:
See also
References
- ^ "The IAS Computer, 1952". National Museum of American History, Smithsonian Institution. http://americanhistory.si.edu/collect ions/comphist/objects/ias.htm. Retrieved May 26, 2011.
- ^ D. A.Godse; A. P.Godse (2010). Computer Organization. Technical Publications. pp. 3–9. ISBN 978-81-8431-772-5. http://books.google.com/books?id=AIHg byyEIHoC&pg=PA3.
- ^ John Markoff (February 22, 2003). "Julian Bigelow, 89, Mathematician and Computer Pioneer". The New York Times.
- ^ a b c "Electronic Computer Project". Institute for Advanced Study. http://www.ias.edu/people/vonneumann/ ecp/. Retrieved May 26, 2011.
- ^ Dyson, George (March 2003), "George Dyson at the birth of the computer" (Video), TED (Technology Entertainment Design), TED Conferences, LLC, http://www.ted.com/talks/george_dyson _at_the_birth_of_the_computer.html, retrieved 2012-03-21
- ^ "Manchester Baby Computer". http://www.computer50.org/mark1/new.b aby.html.
Further reading
External links
