For those inspired by Harry Porter's Relay Computer, here's a link to a suitable project/course to get your teeth into understanding how these things work from the ground up.

Does anyone know about any alternatives to this course? Just curious.

Project Oberon http://www.inf.ethz.ch/personal/wirth/ProjectOberon/

discusson on HN a few weeks ago https://news.ycombinator.com/item?id=6829464