Bear with me here...I'm an EM guy who is going to try to fix my first SS project game. I picked up a nice looking/cheap/local Bally Night Rider. I'm going though the Pinrepair guide and Pinwiki and think I've come across an issue. My game has Roms in U2(E-724-25-U2) and U6(E-720-20-U6). I'm reading that the correct roms should be U2 721-21 and U6 720-20. I think my U2 is wrong..maybe from a Bobby Orr game..can anyone confirm? I should note that the game game with a box of spare boards, but none of the extra mpus came with roms. I do not believe the person I purchased it from ever had it working. If I'm missing the correct U2, where can I purchase one?

Here are some photos of my board. I want to use this one because the others have more extensive battery acid damage.

PICT1608.JPG

PICT1613.JPG

This is a bit more complex that I first thought. I'm using a -17 board. Just to clarify some info on pinwiki..

If I choose to go the route of using a single 2732 at U2, I would only have to use jumpers 6-7 and 8-9 and use the following:

When using 2716's at U2/U6 or a single 2732 at U2, you need to make
this modification at chip U18: cut the trace going to pin 4, and connect
pin 5 to the cutaway trace's via ("trace thru dot").

Is that correct?