That's an '85. I have the same bike but in an East Hill size. I love the bike, nice ride. Though, the components do not match up with the brochure. But then again, either did mine. According to the brochure, it is suppose to have Shimano shifters and derailleurs but mine had Suntour components.
The brochure is at http://www.vintage-trek.com/images/trek/85TrekSport.pdf