I am a student diver and inherited this first generation Atmos AI with compass and quick disconnect from my cousin. I don't have any way to connect it to a PC, or any software. How old is this thing? I don't have the manual and don't know if the ones I am seeing online are the correct ones. My instructor put a new battery in it so it gives me tank information. From playing with it a little it has my cousin's old dives in it. I am leery of putting my faith in something I know very little about. Been all over the internet but can't find much info except for the manual. My cousin is out of the picture, so I am on my own.