| 摘要 |
PROBLEM TO BE SOLVED: To provide a game machine carrying a one-chip microcomputer for control which achieves a difficulty in the reading of built-in programs from outside and further in the fraudulent generation of microcomputers. SOLUTION: A security checking circuit 550, an inspection mode recognition circuit 501, an input/output buffer control circuit 502 and input/output buffers 503 and 504 are built into a microcomputer 56 for controlling games along with basic components of a CPU core 561, a ROM 541, a RAM 542 and the like. Moreover, a voltage monitoring circuit 564 is built in. The inspection mode recognition circuit 501 enables the outputting of the data on the address buses and data buses outside if inspection codes from an inspecting device 500 are regular ones. COPYRIGHT: (C)2004,JPO
|
