If you have ndsbios and they must be like this:
Make sure you put d3dx9_31.dll in neonds folder. The bios7.bin should be 16kb and abios9.bin should be 4kb. Renaming them to bios7.bin and bios9.bin.
More information about formatting options
If you have ndsbios and they must be like this:
Make sure you put d3dx9_31.dll in neonds folder. The bios7.bin should be 16kb and abios9.bin should be 4kb. Renaming them to bios7.bin and bios9.bin.