Casio Computer Co., Ltd. (Japanese:カシオ計算機株式会社 Kashio Keisanki Kabushikigaisha) TYO: 6952 is an electronic devices manufacturing company founded in 1946, with its headquarters in the Japanese capital, Tokyo. Casio is best known for their calculators, audio equipment, PDAs, cameras and watches. In 1957 Casio released the world's first entirely electronic compact calculator.