Geniac Recreation - Wiring stories with an online "Electric Brain"

GENIAC was a build-it-yourself computer kit for teens published by ACM co-founder Edmund C. Berkeley in 1955.
With 6 rotatable wheels, ten light bulbs and batteries, young experimenters could wire simple circuits to demonstrate digital logic, play crude games and design simple puzzles.

A basic overview video of what Geniac is (45 seconds)

The iconic Uranium Shipment example with one of the few remaining authentic Geniac machines (3:45)

This academic project was an attempt to recreate the functionality of GENIAC and its successor products using 2D web technologies, allowing a new generation of users to play all of the original circuits as well as create and share their own designs.
The wiring system was designed in Javascript from scratch to copy the functionality of it's powered wiring system, and I learned PixiJS for the graphics.

Try it out here, but it doesn't seem to display the gears on some types of browsers. Comes with its own tutorial, and I'd reccomend turning realistic mode off in the options if its your first time playing (to see the connecter bolts better).
If that doesn't work you can download it here, unzip the file and run the ReGeniac shortcut.