Not sure if S-69 was FBW or not
Look at the era they flew the S-69 during. Did your car back then have a carb or electronic fuel injection? I think that may lead you to an answer.
did it preceed Shadow version of S-76?.
It seems like in the past several decades the designation number has been close to the year of conception. I think the S-92 was announced in 1992, though it was longer before it was certified. In either case, the model number is a sequence designator, so the S69 would have preceeded the S70, 71, 72, 73, 74, 75, and 76. The S70 was the blackhawk, some of the ones in between were probably research aircraft, or the designation never went anywhere. Maybe they were top secret intermeshers.
-- IFMU