From owner-freebsd-questions@FreeBSD.ORG  Wed Jun 11 23:44:20 2003
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Date: Thu, 12 Jun 2003 13:44:10 +0700 (ICT)
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To: bernard.dugas@is-production.com
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cc: freebsd-questions@freebsd.org
Subject: Re: how to talk to the serial and parallel ports through a C
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I'll reply on the parallel port:

fd_relay=open("/dev/ppi0", O_WRONLY);
ioctl(fd_relay, PPISDATA, value)

Value being an 8 bits value.

That works wonders with the relay card from Quality Kits
http://www.qkits.com/serv/qkits/diy/pages/QK74.asp

As for the entry, as I only needed 2 contacts, I used mouse button
(plus it provides a nice testing interface, just click on your mouse
buttons :)

Olivier