Running Unix v5 in SIMH
From Computer History Wiki
UNIX Fifth Edition only exists as an RK05 disk image, so this is pretty simple to get running.
First you'll need the disk image, it's in any TUHS mirror, and a direct link to the file here.
boot.ini
set cpu 11/45 att rk0 v5root boot rk0
Then boot it up something like this:
PDP-11 simulator V3.8-1 Disabling XQ @unix ;login: root #
You do have to tell the bootloader to boot the unix kernel.. and there is no password for the root user.