Madden NFL '99 (Nintendo 64)

GameShark and Pro Action Replay Codes

Note:
A GameShark or Pro Action Replay cartridge is required to use the codes featured below.

North American (NTSC) version

Unlimited time outs home team:
8005CF89 0003

No time outs home team:
8005CF89 0000

Unlimited time outs away team:
8005FA49 0003

No time outs away team:
8005FA49 0000

Home team scores 50:
8005CF87 0032

Home team scores 0:
8005CF87 0000

Away team scores 50:
8005FA47 0032

Away team scores 0:
8005FA47 0000 
All codes above from The Code Master

Official codes from InterAct.
Codes from The Game Shark Code Creator's Club.