However, nowadays, it makes little sense to port to a machine which can not
support more than 16 megabytes of memory.
Mark Dapoz and Roger Florkowski ported a mix of 4.3BSD and 4.4BSD to the romp in the late 1980's, for educational sites not wanting to run AIX on their machines. This port was named ``AOS''.
The code eventually was released to the community in the late 1990's, with uncertain license terms. People on the list started to play with the code, fixing bugs in it, making it compilable with gcc, and slowly filling the gaps between the 4.3BSD era and modern times. But unless someone dedicated to this effort ends up having too much time on his hands, a free operating system port will never happen.
There is currently no code publically available, however, people used to work on the code, and patches used to flow privately or on the list from time to time. Nothing has happened within the last ten years, though. Contact Miod Vallat if you are deluded or want more information.