The Econet Bridge is a miniature BBC micro, run by a 6502 processor and an 8K ROM containing the Bridge software programme.
The Bridge has 8K of RAM for buffering data transfers. In this Bridge the RAM is on a single 6264 RAM chip but there are three empty spaces indicating that earlier Bridges had four 2K RAM chips.
There are two Econet interfaces on the Bridge, one for each network, and two sets of links for setting the network numbers.