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Input/Output Operation Asynchronous STATUS Reporting Technique Disclosure Number: IPCOM000038456D
Original Publication Date: 1987-Jan-01
Included in the Prior Art Database: 2005-Jan-31

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Bourke, DG Cook, RL Downs, ES Kurtz, HL [+details]


This article describes a technique for use in the input/output (I/O) subsystem of a data processing system that provides for status reporting in line with an asynchronous I/O operation to eliminate additional status reporting operations. Fig. 1 illustrates a representative set of essential I/O command (Image Omitted) parameters for starting and I/O operation. The size of fields chosen for the illustration is arbitrary. The parameters are: .The command byte; The I/O address showing a field for specifying up to four main I/O; busses which may be attached to a processor and a field for specifying the address of the target device. A storage address pointing to an I/O control block (IOCB) in the main storage of the processor.