Memory cartridge including a key detector for inhibiting memory

Details Memory cartridge including a key detector for inhibiting memory Memory cartridge including a key detector for inhibiting memory

1993-05-20

1995-06-20

Gossage, Glenn

Static information storage and retrieval

Magnetic bubbles

Guide structure

395575, 395750, 365 52, 365228, 365195, 364DIG1, 273435, G06F 1216, G11C 700, A63F 924

Patent

active

054267633

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.

REFERENCES:
patent: 4332009 (1982-05-01), Gerson
patent: 4462076 (1984-07-01), Smith, III
patent: 4799635 (1989-01-01), Nakagawa
patent: 4800533 (1989-01-01), Arakawa
patent: 4865321 (1989-09-01), Nakagawa et al.
patent: 4916662 (1990-04-01), Mizuta
patent: 5014982 (1991-05-01), Okada et al.
patent: 5095798 (1992-03-01), Okada et al.

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