Ultima VII is a classic RPG for dos, and may also be emulated with Dosbox or Exult. The links to download each of these programs on your computer are below.
One of the greatest roadblocks in the story are the signs which are written a special alphabet exclusive to Ultima which uses Nordic letters instead of common English ones. If you read any sign in the game, it's like reading gibberish.
As opposed to memorizing the rune language translation, let this Rune Converter do it for you! Just download it onto your phone and bring it with you in your quest to save Britannia.
Ultima VII The Black Gate: http://www.myabandonware.com/game/ultima-vii-the-black-gate-1sn