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There used to be an ``OpenBSD/romp'' effort to port OpenBSD to the IBM 6150 and 6151 machines, also known as RT/PC. These machines were IBM's first try into the workstation world, in 1986, and are the ancestors of the RS/6000 machines of today.
However, nowadays, it makes little sense to port to a machine which can not support more than 16 megabytes of memory.
A (very quiet) mailing list dedicated to the OpenBSD/romp porting effort is
available at romp@openbsd.org.
It has not seen a message in years.
To join the OpenBSD/romp mailing list, send a message body of "subscribe
romp" to majordomo@openbsd.org.
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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.