The inputs were mainly electro-mechanical links. There were three or four FT's around the machinery, but there was an optical rangefinder in the gun director on top of the ship that also had a radar unit. It was hooked up via synchs and servos to the computer, and the output then went to the gun mounts in the same manner. WE had 5"38's on the Perkins.
In the computer room, there was also a big gimballed gyroscope that kept the level on the guns, again through a servo system. They would pitch and yaw with the ship's movement. We could lob our rounds accurately up to 12 miles +/-.
The toughest part was underway replenishments, alongside and hand-by-hand transfer from the supply ships. Firing the guns was just a pull of a trigger!!!
_and_the_Spruance-class_destroyer_USS_Cushing_(DD_985)_conduct_an_underway_replenishment.jpg&f=1)