The following are known Action Replay Codes for Descent Maximum on Sony Playstation (PS1).

The codes should work with the region specified but may work for other regions as well.

Device Compatibility: Action Replay, CodeBreaker & GameShark

Level 5 Laser
800e93060404

Extra Weapons
800e930cffff

Infinite Lives
800e93040404

Infinite Energy
800e92fe03e7

Infinite Vulcan Ammo
800e9316270f

Always Have Earth Shakers
800e933a0063
800f86680009

Infinite Shields
800e930203e7