I made a video about it which I will embed here however, below that I wanted to give the same information but in written form.
With the advent of the tremendous new S-Video cores from Mike Simone, we can now get native S-Video (and by extension, composite) video from the MiSTer’s analog IO board. The goal of this guide is to help you understand how the cores output S-Video and show you a range of options for how you could hook this up to your TV. At the time of writing the project is still a work in progress, so this information could change over time.
As I explain at the end of the article, when the project is released then Mike will also be releasing designs for a low cost open source dongle which which will handle most of these steps for you.… Read the rest