Someone crafted a redstone PC in Minecraft to play Minecraft inside Minecraft

pcgamer.com:

This is the Chungus 2, a fully working PC built inside Minecraft—so you can play Minecraft while you play Minecraft. But that's not all it does, oh no.

Also known as the Computational Humongous Unconventional Number and Graphics Unit, this machine is the lowest spec thing I think I've ever written about. But hats off to project lead Sammyuri and team for managing to push Minecraft redstone crafting to new heights.

Essentially what we're looking at here is a virtual machine, only these utter ballers painstakingly crafted the components using the tools Minecraft has to offer—along with a healthy helping of code—and put them together in-game.

«Built over a period of many many months, with a significant amount of planning and dedication,» the video says in a rather swift wall-of-text splash screen. 

It then goes on to detail an important disclaimer:

«Some viewers, for example those used to videos of simpler farms and piston doors, may not be able to comprehend the scale of this build and may suffer adverse affects including but not limited to having their minds blown in spectacular fashion.»

Honestly, it is pretty mind-blowing watching all the components chugging along in real time, so we thought we'd bring you the specs so you can see what they managed to scrape together using Minecraft materials alone.

8 bit data, 16 bit fixed size instruction length 1Hz clock speed, 4 stage instruction pipeline (fetch — decode — execute — writeback) 64 byte automatic 8-way associative data cache and 256 bytes RAM Up to 256 addressable I/O ports 7 general purpose registers Over 40 ALU functions, including a hardware barrel shifter, multiplier, divider and square rooter 32x128 byte program pages for a total of 4KiB program storage

The CPU