Comment by keithpeter

http://www.computinghistory.org.uk/det/20622/Taos-Operating-...

A photo of a package for Acorn Archimedes refers to a 'developer edition'. Archimedes computers could host transputers.

http://chrisacorns.computinghistory.org.uk/AcornOS.html

Right at the bottom - labelled as 'never released'

https://en.wikipedia.org/wiki/Phoebe_%28computer%29

Looks like Acorn were considering TAOS OS just before retiring from the general computer business.

EDIT: A later development after they went into embedded with some kind of java based runtime

http://www.osnews.com/story/157/Tao_Group_on_ElateOS_AmigaDE...