Control system for software of external storage device

Abstract

Abstract PURPOSE:To activate a CPU of the main body only when the 1st and 2nd processing means have the prescribed relation between both working states after executing programs through said 1st processing means of an external storage device and 2nd processing means of the main body. CONSTITUTION:An operation is started when the power supply of a main body 1 is turned on after a ROM cartridge 2 is attached to the main body 1. Then a locking IC 14 resets various devices of the body 1 such as CPU 12, a VDC 13, etc. and holds these states. The synchronization is secured between the IC 14 and a key IC 24. Under such conditions, both IC 14 and IC 24 perform the prescribed arithmetic processes and the results of these processes are transferred between both IC 14 and IC 24. Then these IC 14 and IC 24 collate their results of operations with each other and checks the coincidence of this collation. This coincidence should be secured as long as the cartridge 2 is normal. Thus no coincidence is obtained when the cartridge 2 is not normal.

Inventors

• 👤 Katsuya Nakagawa
• 👤 克也 中川

Bibliographic Details