Wow, that far back? I'd assumed it was later (considerably later). Looking at the 2.9 networking stuff: https://minnie.tuhs.org//cgi-bin/utree.pl?file=2.9BSD/usr/net/sys/net it does indeed have _no_ NCP support. Absolutely; running in an emulator is, I have found, a key step on getting an old OS running. I've found Ersatz-11 to be really good for PDP-11 emulation. Indeed; part of the problem, if the goal is going to be 'run it on real hardware' is 'what network interface to use'. All the ARPANET interfaces are out. There are drivers there for Proteon, Ungermann-Bass, Xerox 3MB Ethernet, etc interfaces, but i) where you gonna find one, and ii) you'll need a router to connect up to most other things. There's a driver for the Interlan Ethernet interface, but AFAIK, those are non-existent. (If anyone has one they're willing to part with, please let me know!) DEC Ethernet interfaces are available, but i) only the QBUS ones are common, DEUNAs and DELUAs are almost impossible to find, that I've even seen, and ii) it would need a driver. Yes, definitely worth looking at; I know it had TCP/IP (we had it on our -11/73 at Proteon), but I don't know which interfaces it supported; probably just the DEC ones (which, given the above, is not necessarily a Bad Thing). Noel