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This is so neat! Theoretically, you could send and receive data to and from the e-reader to a pc/phone app? Like, extra stuff in addition to the dotcode. Adding support for QR codes, AR markers, and NFC tags to a printed e-reader card would be awesome.

That would be neat for sure. This device is more like turning your PC into another GBA, with the USB cable acting as the "link cable" between them. You wouldn't be able to do anything additional to the e-Reader with it.

But, it can also pretend to be an e-Reader, so someone could add support for scanning a QR code that then gets sent to a game as if it was an e-Reader card that was scanned for example.

The e-reader has support for linking to another GBA game, Gamecube, or another e-reader. I'm interested in all of those methods for potential indie games. Having NFC/QR codes that extend the function of the cards beyond just the GBA would be cool. Yugioh cards have passwords you can enter in-game.