I've recently discovered this little Koei gem translated to English by RTK fans and thought I would share with all of you here. Its called "Legend of Cao Cao"- a turn based strategy game developed by Koei in 1998. You basically play as Cao Cao starting from the Alliance against Dong Zhou...If you are an RTK fan and have read the novel, and other historical sources you will recognise many of the characters, stories, and campaigns.
Download game from the link below:
http://the-scholars.com/viewtopic.php?f=3&t=18359
Download the "LoCC.zip" file & the "Nov 17 patch" in the link provided and you are done. Then just extract the folder and use the .exe file inside to launch the game and ENJOY!
Some screenshot of game play (this is the first campaign involving the alliance against Dong Zhou).