| 摘要 |
PURPOSE:To permit the mixture of plural program versions in one system by discriminating the program version of a sub-microprocessor. CONSTITUTION:The program version storage part of sub-microprocessors 23-25 for line wire interfaces 17-19, and the program version storage part of sub- microprocessors 26-28 for telephone set interfaces 20-22 are provided within a RAM12 in a control part 10. Each of sub-microprocessors 23-28 writes periodically it sown program version at a data conversion RAM13. A main processor 11 reads in periodically the content of the RAM13, and writes it on a corresponding area in each version storage part. The control part 10 reads out a written version, and executes a performance.
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