Changes

This issue also affects [[Game Boy Advance emulators#Oversaturation|Game Boy Advance emulation]].

===Unlicensed Mappers===

However shit hits the fan when it comes to '''unlicensed games''', since they didn't necessarily respect Nintendo's specifications about how a given mapper type should handle its memory and behave in general, and internal headers were often filled with erroneous data to hinder dumping and emulation efforts. Some emulators like MESS and [http://hhug.me/?tags=hhugboy hhugboy] try to emulate that behavior with various degrees of success ([http://hhug.me/dump/ Compatibility List]). The hhugboy project also proposed a similar solution to iNES for this mapper problem, as the [http://hhug.me/gbx/1.0 gbx ROM format] that appends a footer with extra information needed for some unlicensed games. However, this format, much less unlicensed hardware quirks, isn't widely adopted aside from tentative mGBA support.

===Hardware===