Ultimate 6264 NVRAM Battery Eliminator - Dual Mode Option - For Pinball Machines

The 11B & 11C boards have the 28 pin holes suitable for a 6264 SRAM already, but they were factory fitted with the 24 pin 6116 SRAM. The 28 pin-out can be seen as two empty plated through holes, either side, and at the front of the 6116 SRAM.