Question: can desmume play gba games?
Answer: Does the 'GBA slot' option let me play GBA games? No. A 'real' DS can use the gba slot to play gba games, but DeSmuME does not emulate this. But a 'real' DS can also use the gba slot to access gba roms and sram so that ds games can import savefiles, and that part is emulated by DeSmuME.