Actually some sort of Ethernet. It was well known by young frenchpeoples in the late 80's thanks to the "informatique pour tous" plan.
It was developped by the '''Science and Technology University of Lille''' (city in northern France).
it could enable to connect up to 31 Thomson (O/TO) computers called "Nanomachines" with a more powerfull computer "head network".
It was largely supplied to various levels of schools by 1985.
=Palette and Video Modes=