Station 129
Here's the Econet interface in the top left corner, with space for clock and termination to be added. This machine also has a 74LS240N instead of a 74LS244 which means the way the station number links work is inverted so a link made sets a bit instead of clearing it.
Also seen here is the wire link bodge between IC27 and S9 required for the disc upgrade to boards before issue 4.