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WRAM Test#
With a controller inserted in the joystick port, hold Up and Left on with joystick and Down and Right on controller 1, then press Reset. The screen will be blue until A is pressed on controller 1. A WRAM test will be performed on memory addresses 0x7F80 to 0xFFFF, where the first byte should be $55, the last byte should be $AA, and the rest are $00.
If this test succeeds, the screen will turn green with OK printed on it, then the game will continue. If not, then it will turn pink with NG printed on it, then the game will lock up.
(Source: Cah4e3)