<text-console>.break "string" [-once]
Set a string to break on for the console. The simulation will stop when this string is written on the console. If text output is intermixed with control sequences for colors/positioning, the break command may fail detecting the output of the string. The -once flag can be used to only break on the first occurrence of string.
xterm-console
<text-console>.unbreak,
<text-console>.list-break-strings