Neo Geo:Monitor Test Patterns
Similar to the 240p Test Suite that's available for other consoles, there exists a set of test patterns to dial in color and geometry settings on your display using your Neo Geo AES, MVS, or CD. See this site for the official release and instruction set.
Neo Geo CD
Burn the following .NRG image file with the software "Nero Burning Rom" with a CD/DVD writer to a blank 650 MB or 700 MB CD-R. Burn as slow as possible (not faster than 16x).
|CD-RW or DVD discs will not work. Also, the data side of the CD-R needs to be bright and shiny. Don't use discs with dark blue, dark green or black data side surfaces because they can't be read properly by the NGCD laser unit and will cause an "DISK I/O ERROR" (for instance Verbatim's "AZO" CD-Rs with dark blue data side will not work).
Neo Geo MVS / AES
Copy the following .NEO file to a flash cartridge and start the "Monitor Test Patterns" tool from the software list. Alternatively, you could build a cartridge by replacing the P1, S1, M1, V1 and C1/C2 ROM chips of a regular SNK cartridge with the files of the ROM set.