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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: Linchpin on October 30, 2003, 08:16:04 AM

Title: Converting AT PSU into amiga :-)
Post by: Linchpin on October 30, 2003, 08:16:04 AM: Update on conversion :- Dudes! The conversion with the a1200 and the compaq desktop is coming along really well... but i have hit a flaw. I have done the actual case conversion, the mobo is ready to be screwed in, i have moved the PSU, angle grinded the case, mounted all the drives.. etc but the damm psu wont work unless there is a mobo attached to it (i thought this may happen).. Now i remember somewhere that there is a way to trick a PSU into thinking there is a motherboard on it.. Any ideas? Its one of the older PSU with the split mobo connecter on it. PS.. I have taken photos all the way through the conversion, so i will post them on a.org for you all to splender!
Title: Re: Converting AT PSU into amiga :-)
Post by: Methuselas on October 30, 2003, 08:18:08 AM: I'd like to see some pics of your Frankenstein.

'He's alive.....ALIVE!!!' :-D
Title: Re: Converting AT PSU into amiga :-)
Post by: Linchpin on October 30, 2003, 08:22:28 AM: No problem - once it is sprayed there will be a full series of before / after pics posted on my website. Damm it looks like a frankenstein at the moment, but it will look good :-)
Title: Re: Converting AT PSU into amiga :-)
Post by: Brian on October 30, 2003, 08:29:59 AM: Very easy.. connect PowerGood (usually orange) with +12v (usually yellow), that's it. :-D
Title: Re: Converting AT PSU into amiga :-)
Post by: Linchpin on October 30, 2003, 08:32:26 AM: Any of the +12V??

What should i get when i measure PowerGood with a multimeter? (So i know i have the correct wire :-)
Title: Re: Converting AT PSU into amiga :-)
Post by: GadgetMaster on October 30, 2003, 08:34:48 AM: The following links will probably provide you with all you need.

ATXspec (http://www.compute-aid.com/atxspec.html)

And from the Aminet Hardware Hack:

Readme File (http://wuarchive.wustl.edu/pub/aminet/info/www/dirs/aminet/hard/hack/atx_psu.readme)

ATX_psu.lha (http://wuarchive.wustl.edu/pub/aminet/info/www/dirs/aminet/hard/hack/atx_psu.lha)
Title: Re: Converting AT PSU into amiga :-)
Post by: JurassicCamper on October 30, 2003, 08:53:58 AM: Connect up hard disc, floppy, cdrom to the power connectors, this should be more than enough load to power up the psu with out the mobo attached.
Title: Re: Converting AT PSU into amiga :-)
Post by: Linchpin on October 30, 2003, 08:54:26 AM: Hmm its an AT psu...
Title: Re: Converting AT PSU into amiga :-)
Post by: Linchpin on October 30, 2003, 08:56:17 AM: Yeah ill try that later :-)

cheers chaps
Title: Re: Converting AT PSU into amiga :-)
Post by: GadgetMaster on October 30, 2003, 09:14:48 AM: Quote

LinchpiN wrote:
Hmm its an AT psu...

Ooops!

Ok try these sites:

http://members.iweb.net.au/~pstorr/pcbook/book5/power.htm (http://members.iweb.net.au/~pstorr/pcbook/book5/power.htm)

http://www.amiga-seal.freeserve.co.uk/aos/TOWER.HTM (http://www.amiga-seal.freeserve.co.uk/aos/TOWER.HTM)

BTW I hope its not the A1200 tower that you are kicking in your Avatar :-D :-P
Title: Re: Converting AT PSU into amiga :-)
Post by: Linchpin on October 30, 2003, 09:28:18 AM: Nope its an AMD K6-2 450 to be exact.
Title: Re: Converting AT PSU into amiga :-)
Post by: GadgetMaster on October 30, 2003, 10:09:41 AM: Aah!

The joys of non-standard power supplies.

Well the Info you require is probably in one of these Compaq technical manuals on this FTP site:

ftp://ftp.compaq.com/pub/supportinformation/techpubs/maintenance_guides/

Too many documents to search through though. It would probably take ages to find.

So I suggest you wait until someone else comes up with a better answer. :-)
Title: Re: Converting AT PSU into amiga :-)
Post by: Linchpin on October 30, 2003, 10:11:31 AM: Hmm its ok i have lots of PSU - i think either JC's fix or the one with the PowerGood is going to fix it - after all its just a standard PSU looking at it. The wires seem the same as the one on one of the above websites.
Title: Re: Converting AT PSU into amiga :-)
Post by: Brian on October 30, 2003, 12:36:33 PM: If it's a standard AT psu (then one of the cables going to the motherboard will have the color combination orange PwrGd, red +5V, yellow +12V, blue -12V, black Gnd, black Gnd) just wire up the PowerGood with any of the +12V whires. I've done that like on 4 AT PSU's by now and so far everyone have worked like a charm. If you can't find an orange line then it doesn't follow the AT standard but you can just open the PSU and look at it's board cause they usually mark it on there aswell (PG, PwG, PwrGd or simular). :-D
Title: Re: Converting AT PSU into amiga :-)
Post by: Linchpin on October 30, 2003, 01:06:12 PM: Cheers mate - will try this later.
Title: Re: Converting AT PSU into amiga :-)
Post by: CannonFodder on October 30, 2003, 01:08:55 PM: Quote
but you can just open the PSU and look at it's board cause they usually mark it on there aswell (PG, PwG, PwrGd or simular)

What !???

PSUs have lethal voltages inside :-o

Don't do anythin silly man.
Safety first. :-x
Title: Re: Converting AT PSU into amiga :-)
Post by: ajk on October 30, 2003, 01:13:03 PM: The electricity doesn't really live in the box, it comes there via the cord... ;-)
Title: Re: Converting AT PSU into amiga :-)
Post by: Linchpin on October 30, 2003, 01:13:09 PM: @ CF, dude tis ok

i have openend many PSU in my time :-)

Always lick the coil before you touch it. That way you drain the voltage.

Heh Heh

BY THE WAY. THATS A JOKE. PLEASE DONT TRY IT AT HOME
Title: Re: Converting AT PSU into amiga :-)
Post by: CannonFodder on October 30, 2003, 01:17:29 PM: Quote

ajk wrote:
The electricity doesn't really live in the box, it comes there via the cord... ;-)

Capacitors man !!

Capacitors that store HIGH VOLTAGES :-o

Cord or no cord.

Anyway it seems he knows whats he doin!

chill :-D
Title: Re: Converting AT PSU into amiga :-)
Post by: Linchpin on October 30, 2003, 01:18:19 PM: Yup he is right...

Lethal voltages stay for ages :-)

(Thats why i have spiky hair)
Title: Re: Converting AT PSU into amiga :-)
Post by: CannonFodder on October 30, 2003, 01:35:14 PM: Quote

GadgetMaster wrote:
Ok try these sites:

http://members.iweb.net.au/~pstorr/pcbook/book5/power.htm (http://members.iweb.net.au/~pstorr/pcbook/book5/power.htm)

http://www.amiga-seal.freeserve.co.uk/aos/TOWER.HTM (http://www.amiga-seal.freeserve.co.uk/aos/TOWER.HTM)

So many links man!

Change your name to GoogleMastah !

or you could try gettin a life :-D :-P
Title: Re: Converting AT PSU into amiga :-)
Post by: Linchpin on October 30, 2003, 01:36:56 PM: I appriciate the help :-p
Title: Re: Converting AT PSU into amiga :-)
Post by: Linchpin on October 30, 2003, 07:00:27 PM: 10 points to JCamper - putting load on (connecting drives) kicked the PSU into life. Well Done :-)
Time for the mobo...