Back in the 1980s the Australian Unix Systems User Group was very active and had bi-annual conferences with lots of interesting keynote speakers.
Richard Miller was one of them, on the subject of the Interdata V6 Unix port. I also remember Professor John Lions (University of NSW) telling the story of Professor Juris Reinfelds (University of Wollongong) lamenting the budget constraints that led to the purchase of the Interdata 7/32, rather than a PDP-11.
Another great talk was by Tim (sorry, forget his surname) from Softway (now defunct) discussing the port of Unix System V to a Tata Elxsi machine, where it ran as a guest under a message passing operating system called EMBOS. One interesting component described a novel heuristic caching algorithm for accelerated directory searching (which was a directed scan in all versions of AT&T Unix up to that time).
I also recall a talk regarding a Cray UNIX port, where a vector copy command was used to copy the per-process-data-area (u.everything) into a fixed physical location in kernel memory at each context switch because it was faster to do that than to fiddle the relocation registers to point to a process-specific memory location when a new process was scheduled.
