There were four fighters, one or two shooter and a couple driving games.
There were also several revisions to the motherboards so that one board can only play the fighting games, another board is used for the shooting games and the last board is only used for the driving games.
In addition, there are two main revisions to the board. Revision one requires a lot of splicing to make it work in a cab, the second revision plugs right into an MVS cab or supergun without modifying the harness.
If you're interested in buying a hyper, being that you're a neo fan you'd probably want the fighting game board.
The four fighting games released on the hyper include
•Fatal Fury: Wild Ambition
•Buriki One
•Samurai Shodown 64
•Samurai Shodown 2