Imagesource: https://www.bigmessowires.com/

Why build an 8 bit CPU with audiovisual support from Ben Eater when you can have a fully functional 4 bit powerhouse with Steve Chamberlin aka Big Mess o' Wires?

Even if math says that 4 is less than 8 ... math sometimes an a33hole, and Steve's 4 bit thingy is more than worth looking at!

12 bit address space and therefor 4kB RAM, Harvard architecture (!), 2.46 MHz clockspeed and only two cycles per instruction are still sub-scalar, but make this thing seriously interesting. In addition, there are 4 push buttons, a 16x2 LCD and a small speaker that you can control.

Curious? Then say an inner prayer and mumble a friendly Hello to Nibbler. (Appropriate name btw.)

Steve's site has all the information you need to build your own. And if you need some food for the upcoming Christmas season, this project might be perfect for you.