Conway's Game of Life cell logic in three TTL logic ICs.
Two 283 adders produce sum of alive neighbor cells from seven cells, then multiplexer choose the next state taking into account the last neighbor cell:
last cell is dead: 0,1,4,5,6,7 -> dead; 2 -> previous state; 3 -> alive
last cell is alive: 0,3,4,5,6,7 -> dead; 1 -> previous state; 2 -> alive
74250 output is inverted, so part of second adder is used to invert in back to positive.