Ok folks, I've uploaded what I call Unix v5a to: http://www.maxhost.org/other/unix-v5-feb-2015.tar.gz I use simh on Linux to emulate the PDP-11/70. The tarball contains: unix_v5_rk.dsk unix_v5_rk1.dsk unix_v5_rk2.dsk pdp11-v5.ini readme-v5.txt unix-v5a.sh The original file is uv5swre.zip if anyone wants to compare them. Mark