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Dreamcast - Speed Devils cheats

Infinite Money
During gameplay, press B, A, B, B, A, Down, Right, Left.

Bonus Money
During gameplay, press A, Right, A, Right, Up, B, A.

Unlimited Nitros
During gameplay, press Down, Up, Down, Up, A, X, A.

Unlock all tracks and cars:
During gameplay, press B, Right, B, Right, Up, B, Up.

Skip Current Class
During gameplay, press Down, Right, Down, Right, A, X, A.

Get 2000.000:
On aspen summer drive into the bridge then drive into the wall and hold 
down A + B + X and you will receive 2000.000. Submitted by: GLUBER

Full pause screen
Press X + Y, while paused the gameplay.