q
This command enables queuing of trace output, in lieu of immediately issuing it to the terminal. When this mode is in effect, the last (most recent) 155 lines of output which would have otherwise been issued to the terminal are saved. The queued output may, at any time, be displayed with the display command.
Output queueing is a very useful technique in a variety of ways. For example, the steps leading up to an unexplained error condition can easily be revealed by engaging a full trace with queued output. Thus, when the error occurs, a display of the queue will usually show what has happened. Another useful application consists of determining the number of times a certain op code or modifier has been used. Simply engage the appropriate type of trace and queue the output. The number of entries which have been made in the output queue can then be displayed, and this value will reflect the number of times the selected op code or modifier was used.
Queuing mode is turned off by another trace command, or by the trace continue (TC) command. Therefore the Q command must be issued after the trace command whose output is to be queued.
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