Jarratt, did you make this publicly available on the SIMH list? It would be great to have a DMC11 device emulated, since I insist on running RSTS/E v8 (for historical reasons... it was the last real RSTS before "the pollution"). RSTS/E v8 doesn't have ethernet support, so the only way I could have DECnet is via a (previously unemulated) DMC11 interface. Does yours work well? -Mark On Sun, Jan 1, 2012 at 3:23 AM, Jarratt RMA <robert.jarratt at ntlworld.com> wrote: Working with a friend, I have written a SIMH emulation of the DMC11 device, so you can do this with SIMH. It tunnels the bytes sent to/from the device over a socket. We have used the SIMH emulation to connect my friend to HECnet over a (simulated) DMC11. The bit I am not entirely sure about is to what extent this is using DDCMP as I don't have a full understanding of DDCMP. Regards Rob On 31 December 2011 18:46, The Presence <tpresence at hotmail.com> wrote: Hey guys, Has anyone worked out a mechanism to connect a node to hecnet using DDCMP? Perhaps some tunneling technology over IP, or virtualized serial? Kevin