NFL 2K cheats and cheat codes for Dreamcast

At the "Options" screen select the "Codes" option, then enter
the following case-sensitive cheat codes:

Change text: Enter "SCRAWL"
Fat players: Enter "LARD"
High pitched commentary: Enter "SQUEEKY"
Sega Sports team: Enter "SUPERSTARS"
Slow-motion mode option: Enter "DEDMAN"
Turbo mode option: Enter "TURBO"

Automatic CPU offense:
Enter to the play selection screen when on offense, push A twice

Automatic CPU defense:
Enter to the play selection screen when on defense, press A twice