The way advent is saved it is dependant on exact conditions when it is saved. If hardware is changed or files are moved it will not work. If you follow the instructions in advent.dc you can resave it. For reference http://www.pdp8.net/pdp8cgi/os8_html/ADVENT.DC?act=file;fn=images/os8/diag-… An updated version is at http://www.rickmurphy.net/adventure.html