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Logic analyzers are proving themselves the single most important instrument for monitoring large digital systems. Supplemented by more traditional instrumentation, both state and timing analyzers prove useful in testing microcomputers and other complex systems. A brief description of state and timing analyzers is given for orientation. An event-driven analyzer is postulated as a more memory efficient architecture for large timing analyzers. Rather than replace timing analyzers, the event-driven architecture should make high resolution and long time window timing analysis possible at reasonable cost.