I got given a third party (Phillips) 32MB module for my VAX 4000-200 recently. I have just installed it. While it seems to work I get this from the console: Memory 0: 00000000 to 00FFFFFF, 16MB, 0 bad pages Memory 1: 01000000 to 01FFFFFF, 16MB, 0 bad pages -- FDM (fast diagnostic mode) not working Memory 2: 02000000 to 02FFFFFF, 16MB, 0 bad pages -- FDM (fast diagnostic mode) not working Total of 48MB, 0 bad pages, 120 reserved pages What is FDM exactly? I suppose it is a feature that is not present on this board as it is 3rd party, but I wonder if it can have any impact beyond affecting diagnostics? Thanks Rob