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Date:      Mon, 30 Nov 1998 11:18:20 +1030
From:      Greg Lehey <grog@lemis.com>
To:        Josh <josh2@marvin.albury.net.au>, freebsd-hackers@FreeBSD.ORG
Subject:   Re: Help programming I/O, a driver?
Message-ID:  <19981130111820.F831@freebie.lemis.com>
In-Reply-To: <XFMail.981130102318.josh2@marvin.albury.net.au>; from Josh on Mon, Nov 30, 1998 at 10:02:49AM %2B1100
References:  <XFMail.981130102318.josh2@marvin.albury.net.au>

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On Monday, 30 November 1998 at 10:02:49 +1100, Josh wrote:
> Hi all.
> I have looked high and low (probably in the wrong place :-)
> but I can not find anything to help me. I want to figure out
> how to control I/O. I can start with the parallel port but
> the I want to be able to do the same thing with a custom
> card etc. I am refering to bit control of the port. I have
> a ADC-DAC card for the parallel port that I have written for
> under DOS but I would love to get it running under FreeBSD.
>
> I understand that this is a bit more difficult under *nix
> but it is possible. I am actually thinking I will have to
> write it as a driver

That's really the only way.  That's what drivers are for.

> but I really have no idea how to do that or indeed if that is the
> right thing to do.

Start with the driver writer's tutorial in the online handbook.

Greg
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