🚀 go-pugleaf

I know almost nothing about ARCNET except that it is a token passing
architecture. 

Question : 
What are the similarities and differences between ARCNET and Token
Ring? (this is really a question about what is ARCNET).

Question :
I know that Token Rings are almost real time capable due to more predictable
response/delay times, allowance for priority etc (simplistically
speaking). How would an ARCNET implementation serve in this regard.

This questions are interesting to me personally as well as a possible
project I may be doing later. Hopefully it is interesting enough to start a
discussion.

jin meng