I recently acquired a DEC M7551 (4Mb memory) board for my 11/23+. I installed the board, but the system traps while doing the power-on memory test. Unfortunately, I don't have any documentation for the board and I'm not sure if I have the jumpers/switches set correctly. It could be that the board is just dead, but I'd like make sure before I give up. If someone could forward me the settings, it would be greatly appreciated. Thanks, Bill King