DE2134402

There is described a computer system in which one or more processors can interrogate, on command, the input/output system to determine whether communication paths are available to the respective peripheral units. The input/output system has one or more multiplexors which service a number of input/ou...

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Bibliographic Details
Main Authors HAUCK, ERWIN A., ARCADIA, PRICE, WILLIAM C., PASADENA, VIGIL, JACOB F., SIERRA MADRE
Format Patent
LanguageEnglish
Published 03.04.1980
Edition3
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Summary:There is described a computer system in which one or more processors can interrogate, on command, the input/output system to determine whether communication paths are available to the respective peripheral units. The input/output system has one or more multiplexors which service a number of input/output channels, each channel having a peripheral control unit that controls one or more peripheral devices. Some peripheral devices are operated by more than one peripheral control unit and associated channel through a switching exchange. The input/output system, in response to an interrogation command executed by any of the processors and identifying a selected peripheral device, returns information to the processor indicating whether or not a communication path is available to the designated peripheral device and, if more than one channel is available, which multiplexor has a channel available to that device. The processor then can initiate an input/output operation between the particular unit and memory.
Bibliography:Application Number: DE19712134402