Funny to see this appear online today. I was discussing the real nand2tetris computer built from 74 ICs yesterday with my 8 year old son yesterday:

https://hackaday.io/project/185131-the-hack-computer-from-na...

and now this pops up.

I'm thinking of buying a bunch of 74xx ICs and buttons and led+resistors somewhere and let him mess with them. It's stone age digital tech according to current norms, but I'd rather see him do it with physical components than behind a screen.