From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <9ab217670601082116kecc9b49r@mail.gmail.com>
Date: Sun,  8 Jan 2006 21:16:34 -0800
From: "Devon H. O'Dell" <devon.odell@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
Subject: Re: [9fans] serial reboot boxes
In-Reply-To: <43C1EE47.6070402@lanl.gov>
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	<43C1EE47.6070402@lanl.gov>
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2006/1/8, Ronald G Minnich <rminnich@lanl.gov>:
> But: you can get reed relays from radio shack. Wire the contacts of the
> reed relay across RST. Drive the relay coil from one of 8 parallel ports
> of a PC. Voila, 8 remote resets. I did use these relays once for a
> remote doorbell, and I can tell you that you could even use the remote
> doorbell + reed relay combo for reset ... that would be amusing. Ring
> the doorbell, reset the rack of machines. The doorbells have multiple
> selectable channels. Fun.

You could use a parallel port to control more than 1 device. With
output and ground, you could use a microcontroller (or probably some
gates, but my EE skills suck) to determine which pins are set and have
an 8 bit mask to control up to 255 devices, I think.

--Devon

> If you have more time than money, this will work. We have more money
> than time, so we use ICE and similar stuff.
>
> ron

Ha. I'd go for a balance between the two :S

--Devon