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 ...

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.