Mod Chip Blog From PS2Cover.com

This is a name that people often call NDS Homebrew kits by. The reasoning for this, we can only assume, is because the M3 DS Simply usese memory card (microSD Cards) in order to store files and folders. So in essence, it is somewhat like a memory chip for your Nintendo DS. It allows you to watch movie (and store them on the memory card), play games, listen to Mp3 music, all stores on a tiny microSD memory chip / card.

So if you're looking for a Nintendo DS Memory chip, you're more than likely looking for the M3 DS Simply or the R4 DS microSD homebrew kits.