Date   : Sun, 05 Jul 2009 14:25:50 +0100
From   : mu.list@... (Mark Usher)
Subject: econet bridge protocol

 It's the same as I reverse engineered from the description of the Acorn
> terminator box at Ian W's Beebmaster site.
> 
> I've made myself a pair to that recipe, and they work well.
> 
> I keep meaning to make a real schematic of it and upload it somewhere.

There is also the diagram in the back of the Adv Econet UG.

-Mark