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.
John has been shown in the future with a new holographic Cosbytop, indicating that John eventually found the old Cosbytop somewhere on LOWAS, or simply reused the punch card after he returned to his house. 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.