Abstract: A programmatic comparator digital testing system is disclosed which cooperates with a host computer driver system and output display panel in order to permit the testing of any given type of standard reference digital electronic module with another electronic module to be tested. Multiple numbers of output signals from the standard reference module can be compared to their analogous output signals from the module to be tested in order to find out of tolerance differences between comparable digital signals which can then be flagged as errors and analyzed by the driver host computer 100 through its display terminal 7.

Abstract: A plurality of digital signals from a standard reference digital module are compared with the corresponding digital signals from a comparable module-undergoing-test. A select multiplexor receives the pairs of signals from the source modules and conveys the signal pairs to each of a plurality of skew comparison circuits for analysis and error reporting to a maintenance-controller processor. The select multiplexor also permits an internal self-test generator to check out the skew compare circuitry and also permits a mask register, programmed by the maintenance controller processor, to select only those signal pairs which it is desired to analyze, rather than merely checking all the available pairs of lines in the system.

Abstract: A plurality of digital signals from a standard reference digital module can be compared to the corresponding digital signals from a comparable module undergoing test. Thus, a plurality of output signals from the reference module can be compared with the comparable plurality of digital signals from the module under test. A select multiplexor receives the pairs of signals from the source modules and conveys the signal pairs to each of a plurality of skew comparison circuits for analysis and error reporting to a maintenance controller processor. The select multiplexor also permits a self-test generator to check out the skew compare circuitry and also permits a mask register, programmed by the maintenance controller processor, to select only those signal pairs which it is desired to analyze, rather than merely checking all the available pairs of lines in the system.