Shenmue has a long development history and was originally being developed and planned for release on the Sega Saturn console. due to the relative failure of the Saturn and due to Yu Suzuki feeling that the game would better suit a more advanced system (to make it realistic as possible) this version was abandoned and work began on the Dreamcast version we have today. Below are some images from the beta version...
This was all apparently running on a stock Sega Saturn console without any enhancements such as RAM carts or video cards etc. It is without a doubt one of the most graphically impressive looking games on the system despite it being unreleased and unfinished! still images do not do it justice so check out the video available in the Shenmue-UK media section here.