When was the first commercially available dive computer released?
Who made it?
What could it do?

The Office of Naval Research funded a project with the Scripps Institute of Oceanographyfor the theoretical design of a prototype decompression analog computer. The Foxboro Decomputer, Mark I was manufactured by the Foxboro Company and evaluated by the US Naval Experimental Diving Unit in 1957.
In 1965, Stubbs and Kidd applied their decompression model to a pneumatic analogue decompression computer.
The firstrecreationalmechanical analoguedive computer, the decompression meter was marketed by Scubapro in 1972. It was very simple in principle: a waterproof bladder filled with gas inside a big casing bled into a smaller chamber through a calibrated porous ceramic cartridge (to simulate tissue in/out gassing), whose pressure was measured by a manometer whose graduation indicated decompression stops. The device was eventually nicknamed bend-O-meter.

Blimey, you managed to find more information than I did.
Spot on.

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