Abstract: A computer data input device is provided which is characterized by a wireless pen for moving over the surface of a tablet. The pen will simultaneously emit magnetic pulses and ultrasonic pulses. The tablet will be equipped with a magnetic detection coil and two microphones. The magnetic detection coil will nearly instantaneously detect the magnetic pulse and serve as a time reference for determining the time it takes to detect the ultrasonic pulses. The detection circuitry will detect a specific point within the ultrasonic pulse and the time travel of the sonic pulse to the two microphones will be used to determine the distance of the pen from the two microphones yielding the position of the pen over the surface of the tablet.

Abstract: A digital film recorder, peripheral and method adapted to receive high level digital command instructions from a host computer or terminal and to develop a color hardcopy therefrom without further graphics instructions. It includes a digital input interface, local computer ROM and RAM, and a display controller for developing the graphics to be stored in a display memory. A lookup memory exchanges data between the display memory, the local computer, and the display controller and contains user preassigned color and brightness information. The output consists of a video and sync signal which may be either alternating RGB or simultaneous RGB delivered to an analog film recorder preferably incorporated as an integral part of the unit. Print command control is direct from the output of the host computer to the digital input of the digital film recorder.