So my "new" HS2 is using the L-1 ROM set. I checked at http://www.pinballroms.com/eproms/wpc.html and there are the following:
CPU Eprom U6 Version P-7
CPU Eprom U6 Version L-1
CPU Eprom U6 Version L-2
CPU Eprom U6 Version L-3
CPU Eprom U6 Version L-5
It says L-2 is considered to have the least bugs. Which one do most of you use in your game? Thanks!