This page is intended to provide an online reference to programming and using the parallel port on Silicon Graphics workstations. Although not yet a comprehensive reference, it provides some useful (and not widely available) information about the port. In particular, it will be useful to people who wish to use the port for simple TTL input/output applications.
So many people have contacted me and asked for this information that I felt it was worth putting these documents online. If anyone has any other information (or questions) about the parallel port, please feel free to contact me, and then we can share the results by adding them to these pages.