I have the booklet on my lap. Typical of any Neo Geo game, $200 is not enough for a complete set of instructions. What it does list:
About Super Techniques
Dunk Fake
In mid-dunk push A again to lob the ball up and over any blockers (defenders).
Dunk Pass
In mid-dunk push B to pass the ball to near-by teammates.
Shoot Block
When an the ball is coming down into the hoop (whether being dunked or shot) push A to jump up and interfere. Timing takes a bit of consideration.
Rebound Dunk
When the ball is bouncing off the hoop push A to make a jumping catch, and A again to dunk it if I translated properly.
Faint
Tap A lightly to fool a defender into jumping then do as you please.
Alley Oop
When you have a player below the hoop push A+B to pass->mid-air catch, and the next bit I don't totally understand but it almost looks like it's saying to jam the buttons or something. Whatever, give it a go and you can deduce the secret to the AO.
Steal
When the ball is going to/coming from a player's hand (ie. when they are neither holding it nor the ball is on the ground) push B to steal it or if your player is in the path a passed ball is taking push B to so steal it.