Looking at some of the components, they're all consistent with about 1990-1991. The fork appears to be a Specialized Future Shock from about 1991. That, in conjunction with the Zoom seatpost, Control Tech stem, and I'm guessing Dia Compe brake levers make me think it's from 1991ish. Even the quick release skewers look like either Zoom, Ringle or similar levers from that era.
Cool bike. What kind of headset is that? Almost looks like a Campagnolo Euclid headset??