DATA PROCESSING SYSTEM

摘要

An interactive work station in which a main microprocessor (1) controls various input/output devices (4) using a read/write memory (6) containing data and/or control code. An auxiliary microprocessor (8) is arranged to monitor access of the memory (6) by the main microprocessor (1) whilst the latter is executing STORE instructions. The main microprocessor (1) maintains a storage allocation table (11) in the memory. The auxiliary microprocessor (8) queues task identification information and STORE target addresses received from the main microprocessor (1) in a stack. By comparing the active task identification with the task identification stored in the storage allocation table (11) for each STORE target address, the auxiliary microprocessor (8) provides a storage protection mechanism for the main microprocessor (1) with substantially no performance degradation of the latter. The task giving rise to the error is interrupted although other independent tasks may be allowed to proceed.