Ah yes! The (then) ubiquitous Mark 1A (One Able) fire
control computer.
Probably the only greater marvel were the fire controlmen who were able
to keep them in operation when repairs were necessary.
Most of the computers were very hardy things and rarely broke down. When
they did, these highly trained technicians would be called in to do the
repairs, using all sorts of special tools (like really thin wrenches and
other "not-at-Home-Depot" type things.
William Donzelli
william(a)ans.net