It also still supports the entirety of the original DS homebrew scene, including my favorite flashcard: the SuperCard DSTWO [0], which includes an onboard CPU and RAM for running software that's more powerful than the host DS! You could feel the chip bulging out underneath the label, and the cartridges went into the slot with an odd "squish" because of that. A ridiculous yet beautiful piece of engineering.

[0] http://eng.supercard.sc/