Thanks, guys - I didn't know that M+ would run on a 11/23. I have kits for M+ v4.3 and DECnet11-M+ v4.3 so that's what I'll try. As I remember the 11/23+ is pretty slow (like half or 1/3rd the speed of a 11/73) and an RD32 is not a huge amount of space (40Mb, although that's probably plenty for RSX). Any hints for what I should or should not include in the SYSGEN? Johnny wrote: SYSGEN, NETGEN and everything in between is rather more cryptic in 11M, just to warn you... :-) I guess I'm making the right choice :-) FWIW, I've done M+ SYSGENs before (years and years ago) and I don't remember those being exceptionally user friendly! Never did DECnet on a 11, however. Actually I'd be tempted to use M because of the smaller footprint, but I don't have kits for that. I'll probably just build the system on simh and, if it works, I can transfer the RD32 image over to the real hardware. Bob