I meant the Readme for the jailbreak firmware. It's all in there. You can still attach a physical Sega CD device (it looks funny) but yeah, terraonion looks like the more elegant, solid-state answer to this. I'm kinda sorta tempted myself. https://terraonion.com/en/producto/megasd/   If it were $100 cheaper, and ran 32X games, I'd jump on it.