Slam Dunk was released in May 1991.
it was one of the first NUDGE slot machines, where when a specific symbols lands above or below the payline, it gets Nudged up or down for a payoff. IGT S+ machine, with physical spinning reels under electronic control. Lots of fun to play, introduced new excitement from the nudge feature, lots of small pays.
IGT Game Index (oct. 1997)