Channel control system having device control block and corresponding device control word with channel command part and I/O command part
November 8, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3728693 3898623 Residual status reporting during chained cycle steal input/output operations Multi sub-channel adapter with single status/address register Device interface controller for input/output controller Channel communicator Printer-tape data link processor with DMA slave controller which automatically switches between dual output control data chomels Data transfer control system for controlling data transfer between a buffer memory and input/output devices I/O controller for controlling the sequencing of execution of I/O commands and for permitting modification of I/O controller operation by a host processor Patent #: 4901232 InventorsAssigneeApplicationNo. 433435 filed on 11/08/1989US Classes:710/30, Frame forming710/11Protocol selectionExaminersPrimary: Lee, Thomas C.Attorney, Agent or FirmInternational ClassesG06F 013/10G06F 011/30 Foreign Application Priority Data1986-07-31 JPAbstractA device control word including a channel command part and an I/O command part is prepared in a main storage unit, and sent to a channel unit together. The channel command part has a common format for different types of I/O devices or I/O controllers thereof, while the I/O command part may have a different format for each type of the I/O devices. Thereby, the same channel unit can be used for or connected to different kinds of I/O controllers by simply modifying software in a central processing unit to correspond to respective I/O controllers. | |
