From owner-freebsd-hackers  Fri Apr 13  9:38:32 2001
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Date: Fri, 13 Apr 2001 12:38:21 -0400 (EDT)
From: David Miller <dmiller@sparks.net>
To: freebsd-hackers@freebsd.org
Subject: [OT] parallel port for IO?
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Hi all;)

Anyone know of a way to get a low cost port of some kind to to simple
state change detection?  The specific purpose is to time external events
which are triggered by breaking an LED light beam.  Millisecond resolution
would be fine.

I was thinking of sampling the parallel port repeatedly and looking for
data lines to be high or low.  Feasible?

Thanks,

--- David


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