This is a Game Boy ROM cartridge I bought new a long time ago, along with an X-Changer for dumping and writing ROMs (with a serial printer cable). The ROM cartridge has been tested and works (see image 3). I haven't tested the X-Changer, but I stored it in a dark place with the batteries removed, so I think it should still work. You should be able to find the necessary applications for your computer online. I will ship via Rakuraku Mercari Delivery.