I got this ad from one of my mid 90's magazines...
Does this thing really made it into the market?....It supposed to be a networked multi-cartridge dock(Rack&Stack,Jack),that allows you to switch between 1 and 6 cartridges...Advertised at only $49.99(1994)....According to the ad,they were also made for the SNES and Atari Jaguar,supposedly distributed by Babbages and EB software stores....In my long gamer years I've never seen one.
http://usera.imagecave.com/capcom2000/HPIM6032.JPG