Date: Tue, 25 Apr 2000 20:51:14 +0200 From: "Leif Neland" <leifn@neland.dk> To: <freebsd-hackers@FreeBSD.ORG> Subject: Turning on a relay. Message-ID: <00b901bfaee7$55da1fe0$0e00a8c0@neland.dk>
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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. What would be the simplest to interface from a shellscript, i.e. the spooler to turn on and off the printer? (The relay has a turn-off delay, so I don't have to worry about turning off the power after everything has been sent, but the printer not finished, or turning off/on between printjobs) Leif To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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