I had a small LCD color one and we plugged the NES into it and played it on the tiny screen. While still sitting in front of our nice 20 inch TV.

It was an even lower resolution than Super Mario Bros 3 as you could tell it couldn't show every pixel, so it was probably something like 120p. It seemed like half the resolution of SMB3 which is 256x224.

But it felt like the future. :)