Texas Instruments Dataman Handheld Electronic Calculator Introduced by Texas Instruments in 1977 and advertised through at least 1981, this educational toy sought to teach arithmetic to children seven years old and up. The device has a gray plastic case, designed to resemble a robot, with an array of twenty-four orange plastic keys of differing shape. These include ten digit keys, four arithmetic function keys, an equals key, a memory bank keys, an on key, an off key, and keys for various games.