This paper model is the IBM 5100 Portable Computer, it's from a Japanese visual novel / Game "Steins;Gate". But it is named IBN 5100 in the game (maybe because of copyright reasons). The papercraft is designed by CLOE.
The IBM 5100 Portable Computer was a portable computer introduced in September 1975, six years before the IBM PC. It was the evolution of a prototype called the SCAMP (Special Computer APL Machine Portable) that was developed at the IBM Palo Alto Scientific Center in 1973. In January 1978 IBM announced the IBM 5110, its larger cousin, and in February 1980 IBM announced the IBM 5120. The 5100 was withdrawn in March 1982.
When the IBM PC was introduced in 1981, it was originally designated as the IBM 5150, putting it in the "5100" series, though its architecture was not directly descended from the IBM 5100.
Steins;Gate is a Japanese visual novel developed by 5pb. and Nitroplus, and was released on October 15, 2009 for the Xbox 360. This is the two companies' second time collaborating after Chaos;Head. A port to the Windows operating system on the PC was released on August 26, 2010 and a port for Sony's PlayStation Portable handheld game console was released on June 23, 2011, with a port for PlayStation 3 released on May 24, 2012. The game is described by the development team as a "hypothetical science ADV". The gameplay in Steins;Gate follows a non-linear plot line which offers pre-determined scenarios with courses of interaction.
The story of Steins;Gate takes place in Akihabara and is about a group of friends who have customized their microwave into a device that can send text messages to the past. As they perform different experiments, an organization named SERN who has been doing their own research on time travel tracks them down and now the characters have to find a way to avoid being captured by them. Steins;Gate has been praised for its intertwining storyline and the voice actors have been commended for their portrayal of the characters. A manga adaptation of the story illustrated by Sarachi Yomi began serialization in Media Factory's Monthly Comic Alive magazine on September 26, 2009. A second manga series illustrated by Kenji Mizuta began serialization in Mag Garden's Monthly Comic Blade on December 28, 2009. An anime adaptation aired in Japan between April 6, 2011 and September 14, 2011. A film will be released in Fall 2012 A sequel game titled Steins;Gate: Hiyoku Renri no Darling was released on June 16, 2011. The 8-bit version of the game titled Steins;Gate: Henikuukan no Octet was released on October 28, 2011.
You can download this anime, manga and game paper craft model from here: Steins;Gate - IBM 5100 Portable Computer Paper Model Free Download