The primary site for parallel port information for Linux is the Linux Parallel Port Homepage. This gives information about current parallel port devices which have Linux drivers, as well as many useful links. The archives for the PARPORT mailing list, and instructions on how to subscribe to the list, are kept here. Documentation for PPDEV, and other parts of the Linux kernel's support for parallel port devices is kept at the Linux 2.4 Parallel Port Subsystem page. The Linux Parallel Port on Custom Hardware Page provides information for hardware hackers including example code for EPP and ECP transfers. Beyond Logic and Warp Nine Engineering are the best sources for technical information on the parallel port available on the web. Each includes detailed information on the workings of the parallel port from a hardware perspective.