When you had finally entered your whole program into memory, you would toggle the switches, move back to memory address zero, press the run button, and watch the little lights blink.
They trained a computer program to recognize what the signals meant They did this by feeding the program simultaneously without put from the electrodes and with representations of the shapes.
Information on how much charge there is between each pair of electrodes is fed to a program that creates a topographical map of where and how the skin’s being touched.
In one interesting example, when a group of researchers tried training an AI program to identify skin cancer, they fed it 130,000 images of both diseased and healthy skin.