Mega Man X4 Secrets:

Ultimate Armor:

Playstation: Highlight Mega Man X at the player selection screen. Press Circle twice, Left 6 times, then hold L1 + R2 and press Start. For the Japanese version, press X twice, Left 6 times, then hold L1 + R2 and press Start. Enter a special armor capsule to receive the new armor.

Saturn: At the character select screen put in the following code with the cursor on X: B, B, left six times, hold L and R, press start while holding L and R. Go through the intro stage, and the parts on X that are originally light blue should be purplish now. Go to any of the armor capsule to get the Ultimate armor. This gives unlimited use of the Nova Strike, which is now also the body crash, which is a more powerful Nova Strike. Also, the X-Buster upgrades are combined, giving X a slightly more powerful blast.

Zero’s Black Armor:

Playstation: Highlight Zero at the player selection screen. Hold R1 and press Right 6 times. Release all buttons, then hold Circle and press Start. For the Japanese version, hold R1 and press Right(6). Release all buttons, then hold X and press Start

Saturn: At the character select screen, put in the following code with the cursor on Zero: Hold R, press right six times, release R, press and hold B, press start while holding B. Zero should now be black and white instead of red and white in the stages. Apparently there are no real differences in performance between the two armors, despite previous rumors.