There is an official emulated version available on the PS3 PSN store. It was developed by a supremely talented small Japanese company called M2. In the game, they included an option to overclock the CPU and it makes a big difference. My favourite way to play the game.

M2 was also responsible for the 3D Sega classics on 3DS which are incredible.

https://en.wikipedia.org/wiki/M2_(game_developer)