So just want to make sure I got the steps right as I've never messed with unstable builds or in development cores before but I really really want save states in my SNES games!
Download latest unstable mister.ini from the discord/github and load that into MiSTer (Wait looks like that is no longer needed!)
Add new SNES core the SNES_ss.rbf to my cores folder
Put the boot1.rom into the games folder with all my SNES roms
Play games?
*Edit: Hmm did the above since my post has to be approved, and now when loading games on the SNES_ss core I'm just getting a black screen. I definitely have save state options in my menu but the games won't load. When I load the normal SNES core all games load just fine.