Yes, the documentation for the file formats is included with either the Door OS or Plusshell documentation that comes in the .ZIP file. >I'm planning to write some new linking software for TI89 and the parallell >link. But i lack information on the link protocol used with this cable. I >also need information about the .89g and the other TI89 file formats. I >couldn't find this on ticalc. Can someone help me here?