More current versions of the parallel port zip drive (ppa.c) program and current technical information of the driver can be found at
http://www.torque.net/~campbell/
Information of many parallel port external device drivers can be found at
http://www.torque.net/linux-pp.html
Parallel Port sharing or through-port information is found at
http://www.cyberelk.demon.co.uk/parport.html
Installing Linux from a zip drive (for machines without a CD)
http://metalab.unc.edu/mdw/HOWTO/mini/Install-From-ZIP.html
An X frontend to the ziptool program can be found at
http://www.scripps.edu/~jsmith/jazip/
Information on configuration of Lilo can be found at
http://metalab.unc.edu/mdw/HOWTO/mini/LILO.html
Information on using bootprompts can be found at
http://metalab.unc.edu/mdw/HOWTO/BootPrompt-HOWTO.html
If you want to install the Linux OS onto a Zip Drive and run the OS from the Zip drive
http://metalab.unc.edu/LDP/HOWTO/mini/ZIP-Install.html
Iomega's web pages are at
http://www.iomega.com/.
And if you are looking for general information about parallel port programming for the PC, you might want to visit
http://www.lvr.com/parport.htm