Dual operating system computer
Patent 5278973 Issued on January 11, 1994. Estimated Expiration Date: 
June 27, 2011. 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.
June 27, 2011. 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 ReferencesInput/output processing system utilizing locked processors Computer with an arrangement for changing its working environment Apparatus and method for a data processing unit sharing a plurality of operating systems Data processor executing microprograms according to a plurality of system architectures Virtual machine system and method for controlling machines of different architectures Patent #: 4814975 InventorsApplicationNo. 722722 filed on 06/27/1991US Classes:717/168, SOFTWARE UPGRADING OR UPDATING712/248, Writable/changeable control store architecture713/2, Loading initialization program (e.g., booting, rebooting, warm booting, remote booting, BIOS, initial program load (IPL), bootstrapping)717/174SOFTWARE INSTALLATIONExaminersPrimary: Shaw, Gareth D.Assistant: Toplu, Lucien U. Attorney, Agent or FirmInternational ClassG06F 009/22AbstractA mainframe computing system is adapted to be loaded with one of a plurality of different operating systems and different associated microcode to provide a computing system which is capable of running user programs adapted to be executed by the loaded operated system comprises a main memory for receiving the desired operating system coupled to a system bus. An instruction processor and an input/output control processor are coupled to the system bus and are provided with an instruction register for presenting user program instructions to the processors. The processor means have associated therewith microcode storage memory which receive and store a set of microcode instructions to be performed by the processors according to the program instruction stored in the instruction register. The stored microcode comprises primary microcode instructions to carry out each of the instructions in the instruction register means. No compiling or emulation is necessary to provide a software configurable computing system adapted to run user programs according to one of a plurality of operating systems loadable in the main memory. | |
