Source: https://hackaday.io/project/176526-but-how-do-it-know-8-bit-cpu-build

Most of us fell in love with breadboards when Ben Eater took the stage of the Youtube world and the availability of SN74xx logic chips swung as much downward, as the manufacturers' profits jumped upward. 📈

Nevertheless there have been plenty of people before Ben, who built 8-bit CPUs and computers from scratch. And on a breadboard. J. Clark Scott for example published his book "But how do it know?" in 2009 and inspired a huge audience to tinker with that seemingly outdated but still relevant technology. Many picked up from there and none other than Patrick LeBoutillier has taken up the baton.

In his Hackaday project and his Video Series he follows Scott's book and builds everything from scratch.

It is not brand new, but still worth watching if you want to get into a CPUs inner workings and can not follow Ben Eaters pace.

Highly recommended!