| 摘要 |
PURPOSE:To prevent the execution of a program other than a dump program from being kept waiting long by installing a write protection key to each memory block and giving a function outputting contents of a memory block to other storage device in a write protection exemption processing program. CONSTITUTION:A write protection key 6 is provided to each divided memory block 5 and if a mechanical interruption takes place in write protection exemption to rewrite the content of the memory block 5, a function outputting the content of the memory block 5 to other storage device 9 is provided in the write protection exemption processing program 7 receiving the control. The write protection exemption processing program 7 is to be dumped and started only when the content of the memory block 5 whose dump is not finished is to be changed to apply dump processing to the dump program. Thus, the delay in the execution of other program is suppressed to a short time.
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