This is my first SS game and I know for sure there haven't been batteries in it for at least 20 years. The manual and markings on the board say + up. When I install batteries all of the digital displays go blank. The markings on the board are hand written with a sharpie. I tried a brand new set of batteries and the displays go out when the first battery is installed. Have tried with power off and power on, same result. Just brought this home couple days ago and can't get too far into it till I finish other projects, but it's driving me crazy wondering what is causing this.