I'm not a young man and my dad used to talk about and work on this stuff back in the 80's-90's he's long since retired. I think your best bet here would be to

I'm not a young man and my dad used to talk about and work on this stuff back in the 80's-90's he's long since retired. I think your best bet here would be to train someone I can't imagine there are many folks left who worked on these systems...