“All the units were connected by the maze of wires shown in the photo of FitzHugh operating the computer. The wires protrude from an insulated board, underneath which they made contact with terminals connected to the various units. To change the connections on the board, for a different problem, it was disengaged from its position, exposing the terminals behind. The computer power supply delivered voltages from -100 volts to 100 volts, and if one of the terminals was accidentally touched, one might receive a nasty shock.
The first thing to do in the morning was to turn on the computer and let it warm up until the voltages from the power supply stabilized. Then computation could begin.” (via FitzHugh-Nagumo model - Scholarpedia)
