E83 : Auxiliary counter pcb
E83D : Water board
Times the duration of the water squirt.
E85C : Strobe light supply
E86A : Quick flashing light pcb
E86B : Slow flashing light pcb
E87G : Credit display
For top of the gun consoles
E87H : Shots remaining display
E87L : NRI adaptor board
Fitted between the coin mechanism and the gun pcb
E87P/1 : mars pcb
Plugged into the gun board