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This is computing the logic of J. H. Conway's game of life.
The first switch represents the current state of the cell (alive to the right, dead to the left, purple led shows the state). The bank of 8 switches represents the current state of the surrounding cells (alive to the right, dead to the left).
The blue led at the bottom shows the state the cell will be in at the next generation (on will stay alive/come to life, off will die/stay dead).
The other three LEDs are the computation of how many neighbours are alive. From bottom to top: two live neighbours (cell will stay alive/stay dead, orange), three live neighbours (cell will stay alive or come to life, green), more than 3 live neighbours (cell will die/stay dead, red).
It's not optimised, I just brute forced it. It's most likely possible to compute it with less op amps. One rule I went by was to use no transistor. The value of the voltage source has to do with another circuit.
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