Protection system for a memory cartridge

Details Protection system for a memory cartridge Protection system for a memory cartridge

G - Physics

11

C

352/40

G11C 5/00 (2006.01) G06F 12/14 (2006.01) G11C 5/14 (2006.01) G11C 7/22 (2006.01) G11C 7/24 (2006.01) G11C 8/18 (2006.01)

Patent

CA 2031506

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, 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 prestored in the program ROM. After the data processing power source is turned-on and the power source voltagereaches a predetermined value, a reset signal is provided to the memory cartridge. Only when the first key data read from the program ROM and the reset signal are both detected is the external RAM accessible by the data processing apparatus. When second key data are detected, the data processing apparatus is inhibited from accessing the external RAM.

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