Bung Enterprises ltd. is a Hong Kong
company that produced devices
for game console
s, most notably development
like the GB Exchanger
for the Game Boy
and the Game Doctor
series for the Super Nintendo
You can load these devices with ROM data and connect them to your console, where they will simulate a game cartridge. This made them cheap alternatives to Nintendo's official development kits. Of course, they could also be used as tools for piracy.
Eventually, Bung were sued by Nintendo and had to shut down their operations, so their devices are no longer available.
Their website is still online at the time of writing, at