Thanks. Currently the question is how to access /dev/lp0 directly in the test-program? The Test-program is based on this article: http://logix4u.net/Legacy_Ports/Parallel_Port/A_tutorial_on_Parallel_port_Interfacing.html So the access to the parport is coded through the _inp() and _outp() functions. It is not clear what the libraries are doing here? We are working now in the grey area between Windows and Linux and this is very special. You don't find many informations about such topics ...
