An additional option is how I get RGB video and clean audio out of my HVC-101 without modifying the console itself:

https://krikzz.com/our-products/cartridges/rgb-blaster.html

It is a lot of work and usually not cheap to get old consoles to capture properly, so I am only bothering with Nintendo consoles as that is what my childhood was. At the time of writing, I have solutions to play games on original hardware from every console apart from the Nintendo 64 and Nintendo DS family. Not because it is not possible, but rather that I can not justify the expense at the moment.