Data processing system with multiple logical space.

摘要

A data processing system comprises a main memory (100), a logical space number storage (480) for storing logical space numbers, a logical address storage (400) for storing logical addresses, address converter (600) for producing physical addresses in response to the logical space numbers and logical addresses to access the main memory. The logical space number storage (480) includes two storages (OPM1, OPM2) for storing logical space numbers to be used in a data access and a storage (ISM) for storing a logical space number to be used in an instruction access, thereby to reduce the time required for the switching between logical space numbers at the data processing.