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  • Transistors!? Many of the devices may have had a few transistors for the line interface, but otherwise controlled everything with cams, levers, electrical contacts, solenoids, and motors. Commented Jan 25, 2021 at 20:23
  • @supercat - you are right of course but I thought that idea might be so far retro that even readers here would think I was blowing smoke. Commented Jan 25, 2021 at 20:45