I've just read that earlier this year, Jordan Mechner had found the source code for the original Prince of Persia
for Apple II, and uploaded it on github
. Apparently, this also includes game data as well.
The story of how the source was thought to be lost and then eventually found is recounted in Jordan Mechner's blog:http://jordanmechner.com/blog/2012/04/source/
Here's another article about the event:http://www.wired.com/gamelife/2012/04/prince-of-persia-source-code/