CHR RAM and PRG ROM Test
Press and hold any button on the second controller, then press Reset. The game will test PRG and CHR ROMs consistency by 16-bit checksum. If the PRG test fails, then the screen will hang with red color. If the CHR test fails, then the screen will be blue. If both pass, then the game will continue as usual.
Note that you must use a specially modified controller for this; normal NES/Famicom controllers prohibit holding opposite D-Pad buttons. Hold Left and B, then reset the console. Release the buttons, hold Right and B, reset the console, and release the buttons. Repeat this process (release, hold, reset, release...) some more, next using Up + Down + Left + B, then Down + B, then Right + B, then Up + Right + B.
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