The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 08, 1985
Filed:
Jan. 06, 1981
Applicant:
Inventors:
Richard S Chang, Rolling Hills Estates, CA (US);
John Y Ling, Chino, CA (US);
Daniel J Shoff, Torrance, CA (US);
Assignee:
Mattel, Inc., Hawthorne, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
G09B / ; G09B / ;
U.S. Cl.
CPC ...
434169 ; 434232 ; 273 / ;
Abstract
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.