You can also solder or plug in a remote battery pack. These older Williams boards put the battery pack at the top of the cabinet where it could leak all over.

You can also solder or plug in a remote battery pack. These older Williams boards put the battery pack at the top of the cabinet where it could leak all over. Later designs at least put it at the bottom where nothing important was below. Another option is to replace the CMOS RAM with NVRAM.