Computer system esp. all-purpose computer - has several host processors sharing same external data storage unit and storage control unit managing storage access and data flow

摘要

The computer system has numerous host processors (1-3), at least one external storage unit (18) (storing data from the host processors and shared by them), a storage control unit (7) overseeing data interchange, a memory device (11a), and two command devices (54, 55). The memory device changes the contents of fixed or variable data storage regions in the storage unit in response to the execution of a write operation into the regions. The first command device reads and the second writes. Each memory device has an entry operating as an adder or subtractor counter during a write operation by a host processor into a storage region. ADVANTAGE - Avoids data loss due to competing host processor.