[rescue] Perverse Question

Sat Jun 7 18:49:47 CDT 2003

  That sounds like a likely explanation.  I'm going to accept the data on 
that and hold onto it until something proves me wrong.

Or I could test one of the old IPC power supplies I have here...

Mike Hebel

On Saturday, June 7, 2003, at 06:51 PM, Michael Free wrote:

> 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
>>>
>>> My e-mail is protected against viruses and spam by MailGuardian
>>>                   http://www.mailguardian.net
>>>           Top notch protection at unbelievable prices
>>> _______________________________________________
>>> rescue list - http://www.sunhelp.org/mailman/listinfo/rescue
>>>
>>>
>> --
>> Medieval Combat anyone? http://www.kingsofchaos.com/page.php?id=694655
>> _______________________________________________
>> rescue list - http://www.sunhelp.org/mailman/listinfo/rescue
> _______________________________________________
> rescue list - http://www.sunhelp.org/mailman/listinfo/rescue
>
>
--
Medieval Combat anyone? http://www.kingsofchaos.com/page.php?id=694655