Interconnection unit for multiple data processing systems
Patent 4204251 Issued on May 20, 1980. Estimated Expiration Date: 
December 28, 1997. 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.
December 28, 1997. 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 3400372 3753234 3916380 Interconnecting unit for independently operable data processing systems Data processing interconnection techniques Patent #: 3984819 InventorApplicationNo. 05/865116 filed on 12/28/1977US Classes:710/305Bus interface architectureExaminersPrimary: Nusbaum, Mark E.Assistant: Heckler, Thomas M. Attorney, Agent or FirmInternational ClassesG06F 15/16 (20060101)G06F 15/167 (20060101) AbstractAn interconnection unit for connecting multiple data processing systems in a distributed data processing network. The interconnection unit comprises a single controller with control and data sections that connect to each data processing system in the network through an interface circuit and a host processor interface circuit that connects to each data processing system. For one data processing system to transfer information to an other system, the one system requests exclusive control of either the data or control section of the interconnection unit. Each section independently and sequentially tests each interface circuit to determine if a control request exists. When a section grants a request, the requesting data processing system transfers information to or from a memory in that section associated with another system in the network. That memory is accessible to all the data processing systems. The controller sends a signal to the other data processing system to notify it that pertinent information is stored in the memory. The other system then can request control of the interconnection unit and process that information. | |
