I agree: running simulated computers inside of Minecraft is a significantly more impressive technical feat than bolting on display surfaces to planes with a mod.

There's a big difference between something being compiled to run inside of Minecraft, versus running a sidecar that streams back a display. It's the difference between compiling and running on your machine, and streaming back a cloud machine using RDP.

Not like this makes a difference to users, who don't know how any of this works. But we are on Hacker News...

People not only built a functional computer in Minecraft, people have run Minecraft on that functional computer in Minecraft. Extremely slowly, obviously, but it did technically work.

Doom is Free Software, and Minecraft is proprietary. Minecraft encourages creativity in the game, and Doom encourages creativity with the game.

Pretty sure this has been accomplished on redstone. It was definitely a demake and sped up >10000x not realtime but I believe it was done.