My stargate gives me a "all systems go" on startup but then says an adjustment failure. It says "CMOS Rom Failure" The machine will work and play but the high score names are scrambled. It will not remember the settings after power down. Sometimes on startup it will have 72 lives and 40 smartbombs and be in freeplay, other times 1 life and 1 smartbomb. It will allow you to make adjustments and keep them while turned on. The machine has a switching power supply installed and adjusted for correct voltage. A Li battery has been installed in place of the old alkalines. There is no corrosion to the board itself and just a little on the original battery holder before replacement. Where is the CMOS and what do i use for replacement?

