International Business Machines Corporation

Michel Kulakowski

Gerard Dalboussiere

Rene R Castel

In a data processing equipment handling communication lines connected to a central control unit through adapters and a CCU input/output bus, an error reporting device is provided in each adapter for reporting error conditions occurring in the adapter to the central control unit. The adapters are of the type including a microcode controlled microprocessor provided with input and output buses connected to the CCU input/output bus through an interface. The error reporting device in association with dedicated circuits in the interface insures the transmission of the error conditions occurring in the adapter to the central control unit, even when such error conditions affect the integrity of the microcode. When the error reporting device detects an error affecting the microcode integrity, it generates a hard stop signal which causes the operation of the microprocessor under the control of the microcode to be stopped and the error conditions to be transferred to the central control unit making use of the same paths as those used for reporting errors which do not affect the microcode integrity.

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Carros, France

Michel Kulakowski