The older miproms with analog drives do not have a battery ram chip. They have a little 3volt nicad battery on top right corner of CPU. And if you got that setup, its at least 25yrs old. If you keep losing floor tables with power outages, buy a new battery and solder it in. The controller has no way of knowing how the power was shut off, with dips or disconnect. It makes no difference if you flip the dips if battery is bad. The newer 21s with digital drive stepped up the CPU to the ram chip setup