On Mon, 7 Jan 2002, Pete Turnbull wrote: Its kind of a long story, but I'll do my best. It boots RT11XM, and runs my program, but the program doesn't seem to recongize some or all of my hardware...I suspect the DRV11-B, but not for any good reason, its just a place to start. I wanted to get info on the DIP switch settings, in case there's more than one way to configure it. I suppose it could be the M7941 as well. This system was assembled from pieces, so none of the modules were part of a working configuration, and although they should be functional. They were bought from a DEC surplus place, so I don't know the history on them. Here's what's in it (4x4 backplane) M8186 MSV11-LK DSD440 interface* DLV11 M7941 Filler card, I forgot the number. M7950 (quad card) *I think its called a DSD440, its a dual RX02 clone made by Data Systems. As documented, the system I'm trying to duplicate was a PDP 11/03L, that was later upgraded to an 11/23. Which, btw, does anyone know the difference between an 11/03 and and 11/03L? It had a 4x9 card cage that was arranged: AB CD ------------------- M8186 MSV11-LK DLV11 RXV21 M7941 M7950 (quad) ADV11-C Spare BDV11 (quad) The only difference I can see besides the generic RX02 and the different backplane is that I don't have the ADV11-C module. I didn't look for one because I don't need it for what I'm doing, although the software was designed to use it, so it may be upset that its not installed, in which case I'll have to get one, or find a way to fake it. Basically, the software starts in a simulation mode if any "hardware port is missing." I'm not entirely sure whether its referring to what's in the PDP, or the data coming into it, but I think its referring to the PDP. I was hoping to try to verify that my M7950 and my M7941 were functional before looking for and installing an ADV11-C. I'm somewhat confident that the hardware attached to these interfaces is functional, based on a few observations with a scope, and the fact that it performs the few functions it can on its own without the PDP. Unfortunately, I don't have the source for the program. Thanks, Tom