Just to "point on the nitty gritty details" To my knowledge; M+ will run on 11/23+ but not upon 11/23 ! (22 bit adressing required). Please also give a thought which serial adapter that is required for terminal access. Old , traditional without buffers etc, or modern 8-port? One nice thing to include during sysgen would might be a TU58! - It connects to just about every system through one "regular" RS-232 port (properly adressed, though) There are fine PC-programs available emulating the old, true 1/4" tape hardware running over COM-port. This gives a path of transfering data "easilly" from SIMH to real HW until the network is up and running. I've heard that the "max block number" is never checed in the TU58 driver, so if the "tape" happens to be longer than an original tape doesn't matter! Happy experimenting! /G ran On 8 jul 2012 15:39 "Bob Armstrong" <bob at jfcl.com> wrote: 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