My elder son's first mountain bike was a Specialized HardRock of the same model year. As he grew and after I bought him a Cannondale Rush for a graduation present, he passed the HardRock on to his younger brother. I believe yours is the next-higher model, with superior frame tubing similar to what I have on my 1988 Schwinn Team Issue Project KOM-10 (that year's Paramountain equivalent). I too, am a fan of these old non-suspension mountain bikes.
__________________
"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069