From owner-freebsd-hackers  Tue Apr 25 12: 1:18 2000
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Date: Tue, 25 Apr 2000 12:30:21 -0700
From: Alfred Perlstein <bright@wintelcom.net>
To: Leif Neland <leif@neland.dk>
Cc: freebsd-hackers@FreeBSD.ORG
Subject: Re: Turning on a relay.
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* Leif Neland <leifn@neland.dk> [000425 12:24] wrote:
> I'd like to turn on a relay to the power for my laserprinter 3 rooms away
> where the server is located.
> 
> I have an i/o board with a 8255 24 bit i/o port.(IIRC)
> 
> So I wrote a simple userland program to do inb/outb, but it dumped core with
> BUSERR, I presume because userland is not supposed to do i/o to the
> hardware.
> 
> I guess I have these options:
> A: write a driver/kernel module to access the port.
> B: use an extra parallel port. (I use 2 at the moment)
> C: use a serial port; I have 3-4 available.

D: open(/dev/io)

-Alfred


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