Logic analyzer with mixed textual and graphical trigger specification

A logic analyzer integrates the capabilities of both textual and graphical description into a common environment, so that each can be used as needed, and in conjunction with the other. In an example embodiment a trigger specification can comprise many "steps". A step can be conceptualized as an atomic segment of flow charting that involves or investigates a quantity or condition of interest. These steps may involve testing, and a decision concerning whether or not to trigger or whether or not to advance to a next step. A given step can be either textual or graphical. A GUT (Graphical User Interface, as in computer windows, and not to be confused with 'graphical' meaning 'waveform-like') on a CRT screen in conjunction with a pointing device (e.g., mouse) provides the presentation of the integrated textual and graphical (waveform-like) trigger specification steps.