After a bit of head-scratching he thought about repurposing the four unused wires on one of the RJ45 Ethernet connectors ... holes we love the serial port used on this Dockstar.

It wasn’t much better back in the days of RS-232 level signaling ... 1987 [Dave Yost] formalized an interconnection scheme using RJ45 plugs and jacks while at Berkeley. The signals were ...