This was also linked elsewhere but a security researcher was able to identify a significant number of undocumented instructions: https://www.youtube.com/watch?v

This was also linked elsewhere but a security researcher was able to identify a significant number of undocumented instructions: https://www.youtube.com/watch?v=KrksBdWcZgQ https://www.youtube.com/watch?v=KrksBdWcZgQ