From owner-freebsd-hardware@FreeBSD.ORG Wed May 14 01:33:25 2003 Return-Path: Delivered-To: freebsd-hardware@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id A391C37B401 for ; Wed, 14 May 2003 01:33:25 -0700 (PDT) Received: from quicksilver.ukc.ac.uk (quicksilver.ukc.ac.uk [129.12.21.11]) by mx1.FreeBSD.org (Postfix) with ESMTP id B39A743FBD for ; Wed, 14 May 2003 01:33:24 -0700 (PDT) (envelope-from A.Simon@ukc.ac.uk) Received: from myrtle.ukc.ac.uk ([129.12.3.176] ident=root) by quicksilver.ukc.ac.uk with esmtp (Exim 3.22 #4) id 19FrhD-0001aZ-00; Wed, 14 May 2003 09:33:07 +0100 Received: from as49 by myrtle.ukc.ac.uk with local (Exim 3.36 #1) id 19FrhD-0002ZG-00; Wed, 14 May 2003 09:33:07 +0100 Date: Wed, 14 May 2003 09:33:07 +0100 From: Axel Simon To: Ivo Hazmuk Message-ID: <20030514083307.GB4184@myrtle.ukc.ac.uk> Mail-Followup-To: Ivo Hazmuk , freebsd-hardware@freebsd.org References: <3EC1ADAC.3050107@lockie.ca> <20030514070519.E68371-100000@hippo.cis.vutbr.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20030514070519.E68371-100000@hippo.cis.vutbr.cz> User-Agent: Mutt/1.4i Sender: "A.Simon" X-UKC-Mail-System: No virus detected cc: freebsd-hardware@freebsd.org Subject: Re: ATX boards and restart after power failure X-BeenThere: freebsd-hardware@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: General discussion of FreeBSD hardware List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 May 2003 08:33:25 -0000 On Wed, May 14, 2003 at 07:17:12AM +0200, Ivo Hazmuk wrote: > > I have an Asus P5A r1.04 mainboard that I want to use for a server but > > it does not reboot after a power failure. > > r1.06 of the P5A does but that doesn't help me. > > Now I have 5 or 6 pieces of this card. If you want I can send it to you. > But I don't know the cost. It was about 60 US$. Indeed, I think you need to generate a pulse after the power comes up and that pulse has to stop within a specific time. But the most luxury version of doing this is a NE555 ($0.12) used as a mono-flop (I know it sounds funny, but that's what it's called when you only want to generate a single pulse.). http://www.national.com/ds.cgi/LM/LM555.pdf (page 7 top left) Connect an RC combination to pin 2 (C to +5V and the R to ground). Calculate this to fall down to 2/3 of +5V which starts the timer. The other RC combination can be choosen so that it gives a 1s pulse according to the diagram on the right. You might need to invert the output, depending if you power switch connects to ground or to +5V. Hope this helps, Axel.