The Bandai Datach Joint ROM System is an add-on for the Nintendo Famicom. It plugs right into the cartridge slot and comes with its own small cartridges. The games are enhanced with barcode cards, similar to the Mattel HyperScan.
The retail package with one included game, Dragon Ball Z: Gekitō Tenkaichi Budokai, is rather easy and cheap to obtain.
In 2006 the Mattel HyperScan was a short lived console with an interesting concept: Enhance a classic videogame with collectible RFID cards. A concept that was picked up in a similar form by the Skylanders games and maybe someday will be used in Nintendo’s new Wii U console.
Playing the games (and scanning cards) can be described as interesting but not as fun. The games seem unfinished and buggy. And then there are the long loading times, a problem already the NeoGeo CD suffered from back in the days.
There were even some first steps with homebrew programs here and here.
In the 80s Sharp made some interesting devices powered by the Nintendo Famicom/NES technology. The less known devices are the Famicom Titler, a video subtitler, and the C1 NES TV/Sharp Nintendo Television, a television set. More common is the Twin Famicom, a console that plays Famicom cartridges and Famicom Disk System Disk Cards (and, with a 72-to-60-pin adaptor, NES cartridges too). This is the black Turbo version AN-505-BK: