Casio have produced some. This old one: http://www.voidware.com/calcs/images/fx451m-1.jpg http://www.voidware.com/calcs/images/fx451m-1.jpg There's been others

Casio have produced some. This old one: http://www.voidware.com/calcs/images/fx451m-1.jpg http://www.voidware.com/calcs/images/fx451m-1.jpg There's been others since with the same basic design. They all seem to fail at the fold because there is no hinge or much protection at the fold. There was a pocket computer from a slightly earlier era http://pocket.free.fr/html/casio/fx-5200p_e.html http://pocket.free.fr/html/casio/fx-5200p_e.html Trying to find an image of those I stumbled across the fx-9860G Slim that seems to be current: https://www.casio.com/resource/images/press/fx-9860gslim_press.jpg https://www.casio.com/resource/images/press/fx-9860gslim_pre...