The 3B20D Processor & DMERT Operating System: Diagnostic Tests and Control Software

Many of the diagnostic principles and features embodied in the 1A Processor 1 have been incorporated in the maintenance design for the 3B20D Processor. These design principles include: (i) use of a specialpurpose test-design language that facilitates test interpretation; (ii) use of a table-driven control program approach; (Hi) use of a common test data base covering all hardware versions of the 3B20D Processor; (iu) partitioning of diagnostic tests into phases associated with specific hardware functions; (v) control features allowing selective test execution and variable degrees of detail in outputted results; and, (vi) optional automatic trouble location. In the 3B20D Processor design, however, a more general diagnostic design approach was followed. This approach resulted in a more portable diagnostic control structure; 367 it allowed diagnostic execution in several environments: factory testing using a support processor, installation testing using a remotely located processor, and in-service, on-line testing of a standby mate processor.