Sony Corp said on Wednesday it will sell its microchip production facilities in western Japan to Toshiba Corp for 90 billion yen ($835 million), in their latest move to focus on their core businesses. The equipment will be used by their semiconductor joint venture that will make high-performance Cell chips and RSX graphic chips, both used in Sony"s PlayStation 3 game console, as well as other microchips that go into Toshiba products. The venture will be established on April 1.