I thought it was one of the CIAs not Paula..
Anyway, it`s all in the 3.1 Dev CD. One write to set the pins IO direction, another to set all the pins states...can`t rememeber the 2 addresses off the top of my head..
Personally, I`d use the parallel.device, that way it`ll be usable to other people with 3rd party cards like the HyperComs etc.