There were sooo many Street Fighter II games. Super Street Fighter II Turbo was actually the fifth game in the Street Fighter II series. This advertisement is for the DOS port of the game that was released in 1995, only about a year after the arcade release.
With a decent PC at the time, the graphics and animation were reasonably close to the original with the biggest problem being the fact that the graphics were ported directly and the aspect ratio was a little off vs. the arcade. There was a little less horizontal distance available in the game. This wasn't a huge deal though.
Super Street Fighter II Turbo introduced a few new play mechanics to the Street Fighter II series. It added new combinations including super combos and air combos. It also features the first appearance of Akuma as a secret character.
This game was also ported to the 3D0, PlayStation and Sega Saturn (as part of Street Fighter Collection in the case of the last two). Arguably the PC version is better than all of these but there is something to be said for the convenience of a game console hooked to a tv. This is especially true today for this game because getting a DOS game to work on a modern PC takes a bit of work. However, there have been a number of re-releases of this game over the years. It was released as part of Capcom Classics Collection Volume 2 for the PS2 and Xbox and then there were rearranged versions for various systems that were somewhat different games.
As far as the original ports, short of emulating the arcade version, your best bet is probably the PC version with the Saturn and PlayStation versions being close seconds. If you are looking for a modern remake, Super Street Fighter II Turbo HD Remix was released for the PS3 and Xbox 360 in 2008 and offers a classic mode.
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