Indigo2 parallel port

[Vincent <vincent.stehle@free.fr>]

 Hello !

 I would like to use my indigo2's parallel port for printing under 
GNU/Linux, but according to some e-mails from the archive (Mar. 2002), 
the indigo2 parallel port has no existing driver yet.
 So I would like to write one.

 Sadly, the only information I have about SGI parallel port hardware is 
the name of the chip: "PI1". I could not manage to find anything with 
google :/
 I would appreciate it very much if someone could point me to a place 
with SGI hardware specifications (parallel port asic state machine, 
registers mapping, etc...)
 Thank you !

--
Vincent