A laptop John created by combining a Clean Cosby Poster with his Computer. Creating it gave him an alarming sense of satisfaction.
During his dash to get to the first gate, the Cosbytop Computer was expelled from his Sylladex, striking an Imp and falling to the planet below. He later creates a second one so that he can become Jade's server player.
John has been shown in the future with a new holographic Cosbytop. The new computer looks like a combination of all of the Kids computers: John's Cosbytop, Rose's Hubtopband, Dave's Turntop, and Jade's Lunchtop.