On 05/25/2016 08:36 AM, Aaron Jackson wrote: All evidence that I've seen suggests that it didn't exist, at least in the wild, even though some documentation does make a passing reference to it (it's quoted in the BBC user manual, I believe, and I've seen it in some Acorn Business Computer marketing material). Acorn - with involvement from Logica - certainly attempted a port of Xenix to the hardware, but it's not clear how far they ever got. I've seen a few corporate emails which suggest that they were encountering severe performance problems, both with the ns32k CPU itself and with transfer of data across the Tube link. For Unix "on a BBC" I think the only option was System III from Torch running on a m68k "Atlas" co-processor. cheers Jules