Mattel, Inc.

John Y Ling

Richard S Chang

Robert M Del Principe

Daniel J Shoff

David A Hostetler

A teaching and entertainment device includes a desk-top console which supports a keyboard, an LCD display matrix, and a plug-in cartridge recepticle. A quartet of LCD drivers each control a quadrant of the display under the control of a first microprocessor. A plug-in cartridge is insertable into the console and contains a second microprocessor. Apparatus are provided for establishing a master/servant relationship of the second microprocessor over the first whenever the plug-in cartridge is present.

Teaching and entertainment device

An electronic game utilizing a phototransducer and a plurality of input switches as inputs to a microprocessor for actuating a display and speaker for providing visual and audible clues to a user in accordance with internally generated signals. The processor estabilishes light sensitivity levels for comparison with incident light levels on the phototransducer for processing by the processor in accordance with the timing and duration of actuation of the input switches.

Growing community of inventors

Chino, CA, United States of America

John Y Ling