it plays videos quite nicely once converted to GBM format, but ive seen that sometimes audio goes out of sync just a smidgen, and stereo is reversed.
it is very simple to use, just insert your SD/mini SD or CF card, run the game manager and point it to your card's location, then select the games you would like to load. then boot the m3 in nds mode, and select the rom you want.
ccording to the M3 site, only three games are incompatible.
im not sure about card sizes, but a 1gig card will do the trick for a movie and some games.
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