On Feb 15, 2013, at 9:24 PM, Johnny Billquist wrote: On 2013-02-16 03:03, Paul_Koning at Dell.com wrote: The thing to do would be to see what happens if you load some multicast address (such as broadcast) into slot 0 of the 16-entry address match table, and the station address into slot 1. For a QNA, that's perfectly fine because all slots are equivalent and the device doesn't do any MOP. It may be that this was a later restriction that RSTS didn't obey. Or it may be a bad assumption in the real LQA that wasn't documented -- or maybe it's just a bad assumption in the SIMH emulation. I haven't yet looked for LQA manuals to give more clues. Ah. I thought you had already checked documentation. Well, I did now, and simh is right. Page 3-31 of the DELQA manual states that the first address is used as the source address for system ID messages. Which edition? I'm looking at EK-DELQA-UG-002 (from Bitsavers) and it can't find anything like that. So I guess RSTS/E just sets it up wrong. More precisely, RSTS/E is written to DEQNA specs, which don't constrain which address goes where. I guess I should see about constructing a patch for this. paul