Not sure if any of you would be interested in this, but I thought it was cool. Apparently, dudes have been recycling NES cartridges and re-programmed Tecmo Super Bowl to include the updated rosters and a few minor edits like quarter length. They've been releasing these the last few years on actual cartridges for NES. There's also emulators out there for these for free.
https://www.facebook.com/TecmoSuperBowl
https://www.facebook.com/TecmoSuperBowl