Some time ago I ask the guys of Piclist about Bi-directional PC Ports
standards. Here is some pointers I've received by the owner of EDESIGN
list Mr. Herman. I hope this be useful to anyone else.

> For IEEE 1284 try:
>        http://www.fapo.com/index.html
>
> A source for economy bidirectional PPs (about$20 retail) see:
>       http://www.lavalink.com/
>
> For general information try the FAQ (quite good I think):
>       http://dragon.herts.ac.uk/data/datasheets/parallel.html
>
> Hope this helps,
> Herman
> ---------------------------------------------------------------
>  H. van den Bergen, School of Psychology, University of Ottawa
>              Ottawa, Ontario K1N 6N5, Canada
>     Tel.: (613) 562-5800 ext. 4297,  Fax: (613) 562-5150
> Need tech help? Visit TECHNET: http://aix1.uottawa.ca/~vdbergen
> ---------------------------------------------------------------

Thanks also to Kalle for you help.

Luiz Marques