In 1978, Prof. Verbaeten ported 7th Ed. Unix to the Motorola 68000 at KU Leuven in Belgium. This port is not archived at TUHS, only mentioned here:
https://eng.kuleuven.be/en/stories/50-years-of-computer-science-engineering
https://museum.cs.kuleuven.be/misc/Tim_Ameye_Sander_Van_Loock_40-jaar.pdf (p. 12)
There's also a paper describing the port which is not available:
Verbaeten, P., Berbers, Y. (1983). Porting Unix. In: Proceedings of UNICOM Conference, San Diego.
If you happen to have pointers to any of this, I would be happy to hear from you!