I don't recognize this board, but it's only a partial photo. Look for a board number on the edge somewhere. All Fanuc 6M and 6M-B controls had two toggle switches on two opposite corners of the board. One was marked "BMU", which is for the bubble memory, and the other is "PRM" or "PARM". If you don't have a main board like this, then maybe you don't have a 6M-B like you think. The main board number will tell me what you have.