Docs for the Anything I/O boards are available from Mesa at
<http://www.mesanet.com>.
The docs for the PLX chipsets used on the PCI Anything I/O boards is
available gratis but not libre from plxtech.com.
Reasonable documentation of EPP parallel port programming is available
in the moschip 9805 docs here:
<http://www.moschip.com/data/products/NM9805/Data%20Sheet_9805.pdf>