Mega Man X5 Secrets and Codes (PSX)

Mega Man X5 is the fifth main game in the Mega Man X series by Capcom. It was released in 2000 for the PlayStation, three years after Mega Man X4, and in 2002 for PC. This was re-released on January 10, 2006 as part of the Mega Man X Collection for the GameCube and PlayStation 2. Set an indeterminate amount of time after the events of Mega Man X4, a new plot to destroy the Maverick Hunters is hatched by Sigma, who has been revived again (as in X4, it is unknown who revived him or how). Sigma, after conducting research on the origin and design of Zero, decides to discover how to unlock Zero's true power, hopefully destroying X in the process.

Sigma attacks the Maverick Hunters directly, intending to lose. When he does, he spreads a Maverick virus across the Earth, throwing it into chaos. Meanwhile, a Reploid mercenary named Dynamo is hired by Sigma to make the Space Colony Eurasia collide with Earth. The Hunters have only 16 hours to avoid collision. In order to prevent Eurasia from striking the planet, the Hunters pursue two options of attack. (Wikipedia)

Codes

Cheat Codes
Enter this code at the character select screen:

Put the cursor on X and press "Up" twice then press "Down" nine times - Ultimate Armor X

Put the cursor on Zero and press "Down" twice, then press "Up" nine times - Ultimate Armor Zero

Unlockables

Ultimate Armors
In the 3rd Sigma stage, when you reach a gap with a single lift that won't fall when you stand on it, slide down the right wall and eventually move through the wall. There is a special secret capsule there.

Black Zero - Come to special capsule with Zero

Ultimate Armor X - Come to special capsule with Unarmored X

Secrets

Beginning the game with X's Force Armor
Before each level in Mega Man X5, you're given a choice of which character to use. You only have X and Zero available to you at the start, though you can unlock a third character of sorts right when the game begins.

If you begin the game as X, you'll automatically unlock the Force Armor, a replica of a fully upgraded X from Mega Man X4, as being available to use in the game's levels. Given how difficult Mega Man X5 is, the Force Armor is a nice recourse to use should you ever get stuck - though it's recommended that you only use the Force Armor if you're truly stuck, as it takes virtually all challenge out of a level when you decide to use it.

Here's the intro of the game, right here: