Abstract: A method of monitoring signal lines on a computer data channel, and copying the respective data transmissions which occur in time sequence into a memory in space sequence corresponding to the time sequence, includes recognizing particular data channel signals, and includes displaying selected portions of the recorded tabulations of data transmissions, which portions include the data transmissions bounded about the recognized particular data transmission.

Abstract: A channel analyzer system has circuits for passive coupling to individual signal lines on a computer data channel, and for monitoring the data passed thereover, with logic circuits having preselectable capability for recognizing transmitted data of interest for further analysis. The system further includes a large storage capability for retaining preselected amounts of data, examining blocks of data so collected and recorded, labeling data samples with an identifier; displaying selected portions of the samples, including representative values signifying the data content and preselected signal line changes of interest, data channel activity prior to and subsequent to the preselected signal line event which is of interest; and displaying the same for providing a visualized summary of activity of a computer channel according to the protocols defined for the channel activity.