A picture similar to this one was on one of my high school text books. Inside the cover was a description of it as magnetic core computer memory. For quite a long time I thought this is what computer chips looked like. The only issue was I was in high school in the 80s, long after such memory was used. Maybe the text book was 15 years old, I don't know.






https://en.wikipedia.org/wiki/Elliott_803
Huh. Clever.
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