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[–]Mnemonic 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

You can do with (on a Ds original or Ds-lite, the Dsi had some extra drm protection that I don't know how to deal with because I never had to) a 'R4' card (aka a rom card, I have another version... forgot the name) which is like a game-card only you can put a micro-sd in it (up to 8gb) with roms and software to run it.

https://www.r43ds.org/products/R4-SDHC.html is an example.