Path: utzoo!attcan!uunet!cs.utexas.edu!tut.cis.ohio-state.edu!pt.cs.cmu.edu!andrew.cmu.edu!dd26+
From: dd26+@andrew.cmu.edu (Douglas F. DeJulio)
Newsgroups: bionet.molbio.news
Subject: Re: A/D converter (PC) ?
Message-ID: <4YiopGa00XcQM2IZcu@andrew.cmu.edu>
Date: 12 Jul 89 13:53:22 GMT
References: <8907111102.AA22650@net.bio.net>
Organization: Chemistry, Carnegie Mellon, Pittsburgh, PA
Lines: 7
In-Reply-To: <8907111102.AA22650@net.bio.net>

Believe it or not, the joystick port for an IBM PC contains four A/D
converters.  Joysticks work by having two trim-potentiometers each,
and one joystick port can handle two joysticks.  They'll return an
8-bit value depending on the resistance across two of the pins on the
port.  They're also about $20 bucks a piece.

Hope this helps, and check to make sure it's accurate first.