perl-Device-ParallelPort -- Perl module that provides low level to the parallel port
http://search.cpan.org/dist/Device-ParallelPort/
This is Device::ParallelPort. It provides very simple low level (byte and bit) access to the parallel port. You need to install one of the modules available for your operating system. As of this writing they include linux direct io, linux par port, simple script (mainly for testing) and windows