Dataman

Dataman was an educational toy calculator with mathematical games to aid in learning arithmetic. It had an 8-digit vacuum fluorescent display (VFD) and a keypad. Dataman was manufactured by Texas Instruments and was launched on 5 June 1977.
Details.
DataMan was designed to resemble a robot. It had an array of 24 keys of differing shape, including ten digit keys, four arithmetic function keys, an equals key, a memory bank key, an on key, an off key, and keys for various games.
The following games, played against the clock, were designed to teach the four basic operations of arithmetic—addition, subtraction, multiplication and division: