[rescue] Perverse Question

[Michael Free]

If I remember right, in classic terms (XT, the last time I dealt with it)
"SENS" or "Power Good" is an input.... the motherboard can tell the power
supply if the power is good. You can route this to ground (iirc) with a
momentary switch for a reset button, something the IBM PC and XT was sorely
lacking.

Luckily they had a little removable panel in the back which made drilling a
hole for the switch much, much easier :)

Mike Free
----- Original Message -----
From: "Mike Hebel" <nimitz at nimitzbrood.com>
To: "Curtis H. Wilbar Jr." <rescue at hawkmountain.net>; "The Rescue List"
<rescue at sunhelp.org>
Sent: Saturday, June 07, 2003 7:31 PM
Subject: Re: [rescue] Perverse Question


> *sigh* Just to end this discussion so it can go off the Rescue list...
> If this were Slashdot I'd watch my Karma sink through the floor.
>
> Got the LX connector layouts here in my hand.  Downloadable from Sun.
> (Sorry only on paper at the moment for me.)
>
> There is no 3.3V so yes you will need a regulator.
>
> The DC current output per the sheet is:
>
> +5V == 9A
> +12V == 2A
> -12V == .1A
>
> This data is for the Classic/LX power supply -Fuji PEX643-30 model.
> 300-1101
>
> My advice would be obviously to take something like an LM7803(?) and put
> in on one of the +5V lines to get your 3.3V.
>
> As for physically connecting them - since you're ruining the power
> supply for Sparc anyway - clip the connector and hard-solder a PC ATX
> connector with the appropriate wiring.
>
> The only wire I don't understand the function of relevant to the current
> discussion is the gray wire marked "SENS" which is the "power good"
> wire.  You'll have to figure that one out on your own.
>
> Mike Hebel
>
> On Saturday, June 7, 2003, at 06:08 PM, Curtis H. Wilbar Jr. wrote:
>
> > Only problem is that all the current will be carried on an IPC/IPX 12V
> > supply....
> >
> > well, not only problem....  without a load on the 5V line, the IPC/IPX
> > supply may not regulate.
> >
> > What you may have to do is that if the IPC/IPX supply does not provide
> > 3.3V, you may need to get a 3.3V regulator to make 3.3V off of the 5V
> > line.
> >
> > -- Curt
> >
> >> Subject: Re: [rescue] Perverse Question
> >> To: The Rescue List <rescue at sunhelp.org>
> >> Date: Sat, 07 Jun 2003 11:03:52 -0400
> >> From: Al Potter <apotter at spankingnuns.com>
> >>
> >> rnovak at indyramp.com said:
> >>> Note that this is probably also the case with many Sun systems which
> >>> are capable of powering up via keyboard. I just thought of this. I
> >>> can't remember if the IPX and IPC and ilk work with keyboard-initiated
> >>> powerup,
> >>
> >> Good Thought!
> >>
> >> The IPC/IPXen don't work that way, but I _think_ the Classic/LXen do.
> >>
> >> I've also considered using something like this:
> >>
> >> http://store.yahoo.com/ituner/posoformi.html
> >>
> >> which is designed to snap into the atx PS connector on the mini-itx
> >> board,
> >> and which wants a single 12v lead, which I cannot imagine NOT being
> >> available from the sun PS.
> >>
> >>
> >> rnovak at indyramp.com said:
> >>> Maybe some of the people who want you dead for wanting to use a good
> >>> case will send you some free Cycle upgrade boards for these critters.
> >>> :) There were Cycle 5-IP boards that would take you as high as 125mhz
> >>> MicroSPARC.
> >>
> >> I actually thought about this as an option, but these boards are HARD
> >> to
> >> find.  I honestly suspect a lot of them got shitcanned at some point
> >> because
> >> no one realized the IPC/IPX in question had been upgraded.
> >>
> >> The upside of a mini-itx solution is that it is x86, and that is where
> >> the
> >> cluster work is really going on in earnest.  The easiest to get up and
> >> going
> >> as far as I can tell is based on Openmosix.  There's a modified
> >> Knoppix CD
> >> that lets you boot a machine, start a mosix terminal server, and then
> >> boot
> >> the rest of the cluster off of it, all without installing anything on a
> >> harddrive.
> >>
> >> http://openmosix.sourceforge.net
> >> http://bofh.be/clusterknoppix/
> >>
> >>
> >> BTW, if you haven't discovered Knoppix, you're missing something.
> >>
> >> AL
> >> _______________________________________________
> >> rescue list - http://www.sunhelp.org/mailman/listinfo/rescue
> >
> >
> > Curtis Wilbar
> > Hawk Mountain Networks
> > rescue at hawkmountain.net
> >
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> >
> >
> --
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