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:
Jun. 20, 1995
Filed:
May. 20, 1993
Satoru Okada, Kyoto, JP;
Nintendo Co., Ltd., Kyoto, JP;
Abstract
A memory cartridge which may be loaded in an attachable/detachable manner to a data processing apparatus, such as a hand-held electronic game machine having a central processing unit (CPU), includes logic control circuitry, a program read only memory (ROM), a bank changing circuit, and external random access memory (RAM). The external RAM is backed-up by a battery. First key data and second key data are initially stored in the program ROM. After a power source of the data processing apparatus is turned-on and a power source voltage reaches a predetermined value, a reset signal is provided to the memory cartridge to enable circuits on the memory cartridge. When the first key data is read from the program ROM and the reset signal is detected, the external RAM may be accessed by the CPU to read and write information from/into the external RAM. When the second key data is read from the program ROM, the CPU is inhibited from such access to the external RAM.