Sega Genesis and Mega Drive
Genesis is the US name for the console and MegaDrive the Euro name..
NBA Jam

Walkthroughs and Guides
Outside link to all the information you'll need on this game, and more!
Courtesy of: Gamefaqs.com

VARIOUS CHEATS

HIDDEN PLAYERS
Enter one of the following initials and hold Start while the third initial is highlighted.
While holding Start, press the indicated button.
The corresponding player will appear on the team selection screen on any team selected. 

Player .... Initials .... Button
Air Dog .... AIR .... A
Al Gore .... NET .... B
Bill Clinton .... ARK .... A
Chow-Chow .... CAR .... C
Sal DiVita .... SAL .... C
Jamie Rivett .... RJR .... B
Kabuki .... QB_ .... A
Mark Turmell .... MJT .... A
P-Funk .... DIS .... C
Scruff .... ROD .... B
Warren Moon .... UW_ .... A
Weasel .... SAX .... C

BUTTON COMBINATION CHEATS

POWER-UP TURBO
Press A, A, A, A, A, A, A, A, A, A, A, A, A, then hold A + B + C on the Tonight's matchup screen until the tip off.

Multiple power ups
Press B, B, B, B, B, B, B, then hold B + C + Up on the Tonight's matchup screen until the tip off. The fire, goal tending, and turbo power-ups will be enabled.

UNLOCK THE JUICE MODE
Press A, A, A, A, A, A, A, A, A, A, A, A, A, then hold B + C on the Tonight's matchup screen until the tip off. The entire game will be faster.

ALL POWER-UPS
Enter the following initials and pressing the indicated buttons to enter that initial:
S (C + Start), N (B + Start), and K (C + Start).
Then, press C + Start at the tip off announcement.

POWER-UP FIRE
Press A, A, A, A, A, A, A, then hold B + C + Up on the Tonight's matchup screen until the tip off.

POWER UP DEFENSE
Press A, A, A, A, then press and hold A again on the Tonight's matchup screen until the tip off.

POWER-UP DINKS
Sweep the D-pad in a Full-Circle while pressing B, B, B, B, B, B, B, B, B, B, B, B, B on the Tonight's matchup screen.

Power-up interceptions
Sweep the D-pad in a clockwise Full-Circle while pressing A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, on the Tonight's matchup screen. Hold the last button press until the tip off.

Display shot percentage
Press A then hold A + B + Down on the Tonight's matchup screen until the tip off.

Submitted by: B. Taylor

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*Please note: In the US and some other regions this system is known as the Sega Genesis. In other regions, including Japan and Europe, the console is known as the Sega Mega Drive.