Computer with multiple operating systems.

摘要

In a data processing system including a central processing unit capable of operation with a plurality of operating systems, a VMSM unit is described for producing a composite decor descriptor from a plurality of possible decor descriptor formats. The VMSM unit includes an input buffer unit 511 and an output buffer unit 515, a control unit 510 to analyze an incoming DATA and provide appropriate control signais, a reconfiguration unit 513 for reformatting the plurality of descriptor formats into a composite format, a descriptor fetch unit 512 for retrieving a descriptor when the signals applied to the VMSM unit contain a descriptor address, and a descriptor master copy unit 514 which contains a copy of the descriptors stored in the addressing apparatus.