| 摘要 |
<p>PURPOSE:To correct a program without exchanging an ROM by assigning one bit of the 2nd storing means to plural types of the 1st storing means. CONSTITUTION:A mask ROM2 fixedly storing and holding a program processing various transactions, a program for setting up a correction program or the like and an RAM3 storing the existence of change of the programs in accordance with each address position of the ROM2 are connected to a CPU1 through a data bus 13 and an address bus 14. In addition, an RAM5 storing the address of the correction program, an RAM4 storing the correction program and an RAM6 storing respective data registered and processed are connected to the CPU1. Consequently, the program fixed and stored in the ROM2 can be easily corrected by assigning one bit of the RAM3 to the plural bytes of the ROM2.</p> |
