| 摘要 |
A control circuit, for use in a telephone switching system, which monitors, controls and transfers data to and from memory, input-output devices and external circuits. A pair of microprocessors and associated read-only and random-access memories are operated in a master-slave arrangement. A comparison circuit continuously monitors the integrity of the master microprocessor by comparing the signal on its data, address and control leads with those of a slave microprocessor.
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