Magnetic core memory replaced vacuum tubes and mercury delay lines with a much more compact and reliable technology. ... MIT Archives, AC 337 Magnetic Core Memory Collection...
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web.mit.edu/6.933/www/core.html
web.mit.edu/6.933/www/core.html
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Above: The first magnetic core memory, from the IBM 405 Alphabetical Accounting Machine. The photo shows the single drive lines through the cores in the long direction and fifty turns in the short direction. The cores are 150 mil inside diameter, 240 mil outside, 45 mil high.
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www.columbia.edu/acis/history/core.html
www.columbia.edu/acis/history/core.html
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This is a 50x photograph of magnetic core random access memory from a 4 KiB memory plane. The picture was taken by H.J. Sommer III, Professor of Mechanical Engineering, Penn State University. It has been released under the Creative Commons Attribution license by him and he asks to be credited as follows:
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en.wikipedia.org/wiki/File:Magnetic_core.jpg
en.wikipedia.org/wiki/File:Magnetic_core.jpg
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Magnetic core memory was developed in the late 1940s and 1950s, and remained the primary way that early computers read, wrote and stored data until RAM came along in the 1970s. ... First we’ll look at how magnetic core memory records, or writes, data.
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www.magnet.fsu.edu/education/tutorials/java/magneticcor...
www.magnet.fsu.edu/education/tutorials/java/magneticcorememory/index.html
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Core memory is non-volitile. So whatever was last written (back in the 50s) on the plane I bought is still there. I find this very cool. --- ; An inclusive history of the invention of magnetic core memory would include John Presper Eckert, An Wang, Jay Forrester, Jan Rajchman, Mike Haynes and William Papian.
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www.fortunecity.com/marina/reach/435/coremem.htm
www.fortunecity.com/marina/reach/435/coremem.htm
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Core memory, or more accurately magnetic core memory is a random access memory (RAM) system that was developed at MIT by Jay Forrester in 1951. It was initially very expensive to fabricate but prices dropped as the market developed.
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www.psych.usyd.edu.au/pdp-11/core.html
www.psych.usyd.edu.au/pdp-11/core.html
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128 Byte Magnetic Core Memory ... Magnetic Core Memory Principles ... Arrangement of Magnetic Core Memories...
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ppewww.physics.gla.ac.uk/~doherty/CoreMemIndex.html
ppewww.physics.gla.ac.uk/~doherty/CoreMemIndex.html
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Magnetic Core Memory; Patent Number(s) 2,708,722; Inducted 1988; An Wang made many notable contributions to the advancement of computer technology, including the magnetic pulse controlling device, the principle upon which magnetic core memory is based.
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www.invent.org/hall_of_fame/149.html
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Magnetic Core Memory; Magnetic Core Memory; Patent Number(s) 3,161,861; Inducted 1990; ... Magnetic core memory also is a non-volatile storage device which means it can retain data indefinitely without power. Military and government installations often find this system attractive, and for years after the more...
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www.invent.org/hall_of_fame/114.html
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