This reminds me of this video of a "reverse-emulated" NES using a raspberry-pi: https://www.youtube.com/watch?v=ar9WRwCiSr0 (you can skip to 3:35 if you're not interested in the jokes).

The author further explains how he did it in this "making of" video: https://www.youtube.com/watch?v=hTlNVUmBA28