The Sega Saturn was cracked 20 years after launch.
This method uses the expansion port to emulate the CD Drive. The how to isn't available yet, but it expected to be published soon.
More info:
https://hackaday.com/2016/07/11/cracking-the-sega-saturn-after-20-years/
Great video, the Saturn was an amazing system, and I'm sure many people would love to be able to store their library via USB, playing classics on the original hardware.
Congratulations man, Saturn was a jewel in Japan and its library was totally amazing.