If you've read some of my posts on this old 1991 NES game before, then you won't be surprised to hear that players have thoroughly hacked the ROM file for this game and done things like updated rosters:

Or added new plays:

Or updated uniform changes since 1991:

You probably also know that they've been able to include expansion teams:


But there's always been a limitation... the league only had 28 teams in 1991, so in order to add an expansion team, they always had to replace an existing team, like so:

And they couldn't fix the divisions, because the schedule was coded deeply into the game.
Not any more.

This was a major breakthrough for Tecmo Super Bowl, allowing the game to be updated to today's league. I look forward to playing a new season with this revamped game.
In case you wanted this updated ROM:
link