it is just because of FAT support. the built in emulator on the mmd is just not very powerfull, AND the mmd does NOT have any ram, which is a crusial part in playing homebrew if you do not have a very fast compact flash card. it tries to read the information straight from the card, and because of that the data is not read fast enough for the game to work, thus making it freeze up. with ram, like on a supercard or m3, when you play homebrew, the homebrew file is loaded onto the built-in ram in the flashcart from the sd or cf card, and then run, letting it be run at much faster speeds.
there is your explenation.
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