Path: utzoo!attcan!utgpu!watmath!uunet!bywater!acheron!clarke
From: clarke@acheron.uucp (Ed Clarke/10240000)
Newsgroups: bionet.molbio.news
Subject: Re: A/D converter (PC) ?
Message-ID: <1989Jul13.032810.6904@acheron.uucp>
Date: 13 Jul 89 03:28:10 GMT
References: <4YiopGa00XcQM2IZcu@andrew.cmu.edu>
Organization: Ciliophora Associates
Lines: 21

From article <4YiopGa00XcQM2IZcu@andrew.cmu.edu>, by dd26+@andrew.cmu.edu (Douglas F. DeJulio):
> 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.

Nooooooo!  They're not A/D converters but rather 555 type single shots.
The game card is useless for anything except joysticks.  Try Data
Translation - they make a whole series of cards that can do what you
want ~$1000 for a twelve bit 16 channel (or 8 differential) analog input
card (DT2801).  Card also has 2 D/A and 16 bits digital I/O.  Easy to
program too ...

I'm just a customer, no financial interest etc. etc. etc. etc.
-- 
Ed Clarke
acheron!clarke