Minimising data loss when peripheral fault occurs - evaluating fault condition in peripheral, breaking off host computer command at peripheral, and interrupting internal operations of peripheral and reporting to host

摘要

A data processing system has a host computer (6) and a peripheral (4) contg. a data buffer (8) for storing information to be transmitted or received over a bus (2). A wait loop routine unit (10) contains a list of instructions to control the read and write operations. When error functions are identified, the internal operations of the peripheral unit is interrupted. Data is saved into the buffer memory and the process recommences when the host computer generates the necessary signal. ADVANTAGE - Protects data within buffer when fault in peripheral occurs.