But it only works in one direction, right? I want something that works in both directions, so that any chip writing to the bus sends the signal to all interconnected buses.
In that thread, have a look at the "Bridge" chip, and how I've wired that up to two buses. It's verbose, but it works.
To your point, being able to link bridges without a chip would be nice, but this does, at least ,work for now.
The problem with this method is that even when both inputs are offline, the bus wires retain some 'memory'. It's some progress, but it's not ideal.
That's gotta be a bug.
I will try to reproduce :)