In his most recent undertaking we find [Ken] elbow-deep in the core memory of a 50-year-old machine, the IBM 1401. The computer wasn’t shut down before mains power was cut, and it has refused to ...

But as they say, anticipation is often more exciting than the final result. Once Andy had built Jussi’s core memory kit, he wasn’t quite sure what to do with it.

Core Memory Cores are rings of ferrite suspended in a grid of wires (visible in the right third of this frame). A charge to a point on the grid magnetizes the ring in a clockwise or counter ...