[HECnet] Does anyone have simh RSX-11 running DECnet on a simulated DUP11 ?

I've got some proposed changes to the DUP11 simulation code in simh, that could do with a quick regression test to make sure they don't break when using RSX as the OS. I don't know RSX myself, and I haven't managed to turn up any useful info via google on how to configure a DUP11 with RSX. If anyone has a fairly simple recipe for getting this working then I could have a go at testing it. However, the test required is pretty simple, basically just to confirm that DECnet still works when using a version of simh that contains my fix. So ideally, if one of you out there is running this configuration, we could work together to try it out. Thanks, Trevor