This software is a 68HC11 simulator that emulates many aspects of an EVBU with a 68HC11 running the BUFFALO monitor program. The user interface to EVBU is similar (but not identical) to what a user would experience using a terminal program connected to the EVBU hardware. EVBU is free software licensed under the terms of the GPL. In addition to a command-line emulation of BUFFALO, the EVBU software provides a logic-analyzer-like interface to the 68HC11 port pins. This allows you to view output waveforms and to construct and view input stimulus waveforms. http://claymore.engineer.gvsu.edu/~steriana/Python/EVBUdocs/
doesn't appear to be maintained. As per http://claymore.engineer.gvsu.edu/~steriana/Python/ it doesn't work on recent versions of python or wxpython.