I think you're right. I borrowed a DZQ11 board from a friend, and I was able to set it to 770400. It returns 000000, but before it was in there, it would just give a ?, so I presumed I had the address set correctly. I tried to boot my program, and it gets right to the end of loading the program, and hangs, although the run light stays on. If I halt the system at this point, is there anything useful I can look at? I suppose if nothing else, I've learned that the program does indeed check for the presence of this module, and that I won't be able to fake it, unless there's some I'm missing here. Come to think of it, I left the vector address alone (I think at 300). Should I have changed that, too, or will it not make a difference since that board won't respond the same as the ADV11 anyway? Btw, the modules in the system will respond to both 18 and 22-bit addresses. Does that mean I'm 22-bit? Unfortunately, I'll have to cough up $350 for a half-broken ADV11-C, or a $750 for a working one, which I really don't want to do. I don't suppose anyone on this list has an ADV11-C (functional, half-functional, or not at all functional) that they wish to part with? :) Tom On Thu, 10 Jan 2002, Pete Turnbull wrote: > Ouch! Sorry, I can't think of anything else offhand. Besides, if the > software is checking for the presence of the board, it might write some > initialisation value to it and try to read its status back. That would > most likely fail if you had the wrong device at that address. > > -- > Pete Peter Turnbull > Network Manager > University of York >