This Is heavyweight champ schematics from an italian video
Netlist;
(net 1 +5V)
(net 2 GND)
(net 3 HANDLE_PULSE)
(net 4 PUNCH_VALID)
(net 5 BODY_HIT)
(net 6 FEET_HIT)
(net 7 HEAD_HIT)
(net 8 BODY_COUNT_CLK)
(net 9 DOWN_LATCH)
(net 10 KO)
(component U1 SN7474)
(pin U1 14 +5V)
(pin U1 7 GND)
(pin U1 3 HANDLE_PULSE)
(pin U1 2 PUNCH_VALID)
(component U2 SN7489)
(pin U2 16 +5V)
(pin U2 8 GND)
(pin U2 1 BODY_HIT)
(pin U2 2 FEET_HIT)
(pin U2 3 HEAD_HIT)
(pin U2 6 BODY_COUNT_CLK)
(component U3 SN7490)
(pin U3 14 +5V)
(pin U3 7 GND)
(pin U3 1 BODY_COUNT_CLK)
(pin U3 12 DOWN_LATCH)
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