Comment by vunderba

I tried doing something like this about 15 years ago but specifically for audio by routing NES NSF rom audio data (square, triangle, PWM, etc) to virtual midi cables attached to VSTs so you could play any old school Nintendo game with modern instrumentation. Was a pretty fun project.

The closest thing I can think of for graphical rehauls is probably shader pack type stuff - Minecraft is a great example of this.

https://www.sonicether.com/seus