Date: Sat, 11 Sep 1999 23:43:04 -0700 From: Mike Smith <mike@smith.net.au> To: Chuck Robey <chuckr@picnic.mat.net> Cc: Mike Smith <mike@smith.net.au>, Luigi Rizzo <luigi@labinfo.iet.unipi.it>, hackers@FreeBSD.ORG Subject: Re: damn ATX power supplies... Message-ID: <199909120643.XAA00669@dingo.cdrom.com> In-Reply-To: Your message of "Sat, 11 Sep 1999 00:22:53 EDT." <Pine.BSF.4.10.9909110020500.28670-100000@picnic.mat.net>
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> > > any idea on how to force ATX power supplies to restart after a power > > > outage without having someone press the 'power' button on the front > > > panel ? All the motherboards i can find now have their bios with two > > > options: > > > > > > Disabled > > > no automatic restart on power failure > > > > You _should_ be able to change this. > > > > > none of them is satisfactory especially for picoBSD things such as > > > routers or firewalls where an UPS is overkill... > > > > You can always hotwire the supply; go dig up a pinout for the ATX power > > connector and you'll see that if you ground the power-on line the PSU > > will come up... > > It's not just a ground, the line that brings up the power is a momentary > switch, so a longish (about 1/2 second) pulse would do it. That would The switch is not connected to the power enable line to the ATX power supply; it's connected to logic on the system board which in turn (in some cases) drives the PE line. If you ground the power enable line for 1/2 a second, you will get (at most) 1/2 a second of power. Sheesh. You could at least speak from _experience_ here. -- \\ The mind's the standard \\ Mike Smith \\ of the man. \\ msmith@freebsd.org \\ -- Joseph Merrick \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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