Acorn Archimedes A410/1 Econet Module

The Econet module fitted to my Archimedes A410/1 is of the later type that provides hardware collision detection and is situated towards the back of the machine next to the PSU. 

The module simply pushes into the two headers on the motherboard and the RISC OS ROMs carry support for Econet in them so there is no requirement for an Econet ROM to be fitted like you had to do with the BBC Micro and Master series of machines.