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The Concept Map you are trying to access has information related to:
historymemory, emerged same time as core memory., created concept for magnetic core... discovered it., burnt out easily, broke, and consumed too much power., vacuum tubes, bigger memory capacity, faster, and more reliable than vacuum tubes, thousands of tiny magnetic ceramic rings all strung on crossed wires like beads, herman hollerith, jay forrester, magnetic core memory, electrical engineering, eniac whirlwind project during wwii, electic current flow to turn circuits on and off, binary digits, cmap part 2, history of computer memory, electronic numerical integrator and computer, characters of information data, heads that read write on magnetic tracks as the drum spun., used rotating drum lined with magnetic material., impulses of electric current running along wires., tabulating machine, punch cards