Hmm, that's not good. If memory serves, in an IGS, IOS resides in a bank of EPROMs and the memory is in the form of 30-pin SIMMs. I'd try re-seating those and see how far you get. I've reseated the SIMMs. I'll test for a while and see how it behaves now. The 1600 does not have DECnet capable software. Perhaps Brian can help out here. Perhaps. The 1600 doesn't look or sound as impressive as the IGS though :-) Regards, Peter Coghlan.