Abstract: A keyboard has a joyball centrally positioned and operable by the operator with a hand, and a plurality of operation keys operable by the operator with the fingertips and disposed in a substantially semicircular array around the joyball. The keyboard is connected to a video camera for controlling the attitude of the video camera with the joyball and adjusting the optical system of the video camera, all with one hand of the operator.

Abstract: An electronic signal processing apparatus, such as, a personal computer, is basically composed of a power section for providing DC operating power from an AC power source and a main signal processing section operative by the DC operating power for performing the minimal necessary functions. The power and main signal processing sections are mechanically connected for relative sliding movements between closely adjacent positions minimizing the overall dimensions of the apparatus and spread-apart positions in which a space is defined between the power and main signal processing sections for accommodating at least one additional signal processing or handling section by which the functional capabilities of the apparatus are expanded.