31 Aug '15, 3pm

Core Memory for the Hard Core

Core Memory for the Hard Core

[Brek] needed to store 64 bits of data from his GPS to serve as a last-known-position function. This memory must be non-volatile, sticking around when the GPS and power are off. Solutions like using a backup battery or employing a $0.25 EEPROM chip were obviously too pedestrian. [Brek] wanted to store his 64 bits in style and that means hand-wired core memory . OK, we’re pretty sure that the solution came first, and then [Brek] found a fitting problem that could be solved, but you gotta give him props for a project well executed and well documented. Core memory is basically just a bunch of magnetizable rings on wires. When you pass enough current through a ring it becomes magnetically charged (North or South) depending on the direction of the current. Once magnetized, if you try to re-magnetize the core in the same direction, nothing changes. But if you flip the polarity o...

Full article: http://hackaday.com/2015/08/31/core-memory-for-the-hard-c...

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