Ouch!
That is the older MPU board in where you had to play with all six banks of dip switches to set it up.
BTW The photo of your board is upside down and only at most 400pixels but yeah...I can see the baks of switches.
You're allowed up to 1000kb per photo.
Click on my photo and you'll see how large and clear you can view it.
The board I have is somewhat more "modern" and they did away with all those switches...set-up is now in a "Menu" on-screen.
All I can say is to keep Googling until you hit a manual for the older dip switch version you have.
Tomorrow I will look and see if I have anything on the dips in the shop.
Sometimes other different games from that era used the dip switches the same way as your MPU.
I'll keep looking too...we'll probably find it.