On this day in 1951, Jay Forrester filed his patent(2736880) for magnetic-core memory, which became the predominantly used memory in computers and was used well through the 1970s.
In memory of the patent Ben North and Oliver Nash have come up with a 32-bit core memory Shield for the Arduino! Check out the great report at the project page on how the memory works. They Include all the Eagle files, Gerber files, parts list, and Arduino code for the boards as well.
Image Source: CHM
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