| 摘要 |
PURPOSE:To change artificially the program of an ROM, by setting properly the contents of an adderss register, a switching circuit and an RAM respectively, then registering an optional number of correcting programs at an optional position. CONSTITUTION:The contents of program counter are stored in a program counter register 1, and the head addresses of the programs to be corrected are stored in address registers 21-2n. Comparators 31-3n compare the contents between the register 1 and the registers 21-2n and deliver ON signals to output signals 41-4n when the coincidence of comparison is obtained. Switch circuits SW1-SWn decide whether the signals 41-4n should be made effective. An interruption is generated 5 in response to the ON/OFF signals of a switch circuit Swi. Then the ON/OFF information of the circuit SWi is set and corrected to an RAM8 via a centeral processor unit. As a result, a data setting device 9 can be changed artificially to the program within an ROM7. |
