Digital display exerciser.

摘要

This invention relates to a digital display exerciser (50) which increases the test and maintenance capability of the computer input/output interface (30) coupling a processor/display unit (22, 24) to a computer (40). The interface includes a memory (32) for storing therein data from data sources (DS) in response to display addresses generated by a processor (22). When there is some test or maintenance operation to be desired or any time the plant is down not using computer, the display exerciser is connected between the output of the interface and the input of the processor, while the data sources and the computer are disconnected from the processor/display unit. The display exerciser can recirculate data stored in the memory to the processor to provide a visual display of the contents of the memory in order to permit checking of the operational integrity of the interface. The display exerciser can also introduce new "simulated" data to the memory to aid in training of control room operators.