re: 2.11bsd DECnet Performance will be horrible, and it will also probably be very problematic Not clear whether you mean that in general, or just about the entirely userspace version. I don't think a completely user space DECnet implementation is even possible on a PDP-11 but I don't see why a kernel-integrated version couldn't be done. 2.11bsd already has TCP/IP networking that works perfectly well. It's not super fast, but then a PDP-11 (at least if we're talking about real ones) isn't a super fast machine either. The TCP/IP speed is on a par with the performance of the rest of the system. We'd probably have to replace the TCP/IP networking in the kernel with DECnet because of address space limitations, so it'd be a kernel build choice for either TCP/IP networking OR DECnet, but I think most people could live with that. Bob