The original gamerom has a bug causing it to not register switche
hits while one of the three 50 point standup targets is scoring. 

For example, the top rollover #5 doesn't light #5 if the nearby 
standup switch 38 hasn't finished counting its 50 points.

This romset contains a patched version of gamerom.716 that uses 
buffered scoring for all 50pt standup switches and eliminates 
this problem.
