The TNS-HCF3 is a Cartridge for your Famicom which you can use to play back NSF Tunes from an SD Card. In comparison to the TNS-HCF1 or 2, this one features more memory, supports the MMC5 / VRC6 Expansion Chips, Multi-Song NSFs, and loads from up to 2 GB SD Cards. Another new feature is that the Expansion Chips are automatically detected, so you dont need to switch jumpers on the PCB anymore. It’s going to be released on the 8th December 2009 for a price somewhere between 7980 – 9980 Yen. (approx. 80-100 USD).
You can see an older Version in action here: