| 摘要 |
PROBLEM TO BE SOLVED: To prevent any illegal action to a device by preventing the writing of any illegal program. SOLUTION: A memory card is inserted into a PC card slot (S1), and when a system is reset (S2), a CPU checks the insertion of a memory card (S3), and detects the presence/absence of an updated program (S4). When the updated program is stored (S4; presence), signature data are extracted (S5). When the signature data are valid (S6; Yes), the updated program of the memory card is downloaded, and stored in the program area of an ROM (S7). When the signature data extracted by the step S6 are invalid (S6; No), the updated program is not downloaded (S9), and normal boot processing is executed, and the program stored in a program area is read, and a settlement terminal is normally started by a corresponding function. |
