I'd never heard of core rope memory before (more http://en.wikipedia.org/wiki/Core_rope_memory), but it's fascinating stuff, as is this effort to collect source code and documentation from the Apollo and Gemini programs.
For those of us who were around back then, it's astonishing how (relatively) crude the tech was.
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Source code for Apollo and Gemini programs
An extensive collection gathered from all over the internet of the source code and documentation for NASA's Apollo and Gemini prog
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