Instructables
I needed a power supply for an old AT motherboard based computer. All I had was an ATX power supply. You really can not purchase AT power supplies any more. Note: before starting on this project, make sure your ATX power supply supports -5vdc. Newer ATX power supplies are not required to support this.  If not, this cable will not work.

Warning: Do this at your own risk. I will not be responsible for any issues.  Make sure nothing is connected to electricity when doing this.(i,e. make sure everything is completely unconnected). If you do not, you will get electrocuted and die, so use common sense and be careful so you do not kill your working power supply and computer either. If you feel uncomfortable doing this, then get a professional to help you. Preferably you should not be color blind. You must know how to solder. Take your time making this cable.

To me the cable was not that hard to make but it did take a while. I also had to make sure of the safety precautions so no one or nothing was hurt and that I was accurate in connecting the wires..
 
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Step 1: Whats needed.

Picture of Whats needed.
20-pin_ATX_connector.png
Screenshot-atx to at pin convert (~-Desktop) - gedit.png
Screenshot-*Unsaved Document 1 - gedit.png
1 - ATX power supply
1 - AT Computer and monitor
1 - ATX to ATX cable Extension (Available a better computer stores)
1 - set AT wires (p8/p9) set from a dead AT power supply.
1 - Toggle On/Off switch (not a momentary switch).
Solder
Electrical Tape
Wiring diagrams for your ATX and AT power supplies. Yours may vary, so be careful. You may have to set up your own wiring conversion diagram. Mine is ONLY for the power supplies I used.

Tools
Wire cutters/strippers
Soldering Iron.
E_MAN4 years ago
Thanks! I have an old computer that needed this. :D
Computothought (author)  E_MAN1 year ago
You are welcome and thank you for the comment. Glad it worked for you too. Nice to know there is another piece of equipment that is not going to a landfill (yet). I am also making a vga to composite cable with just a few resistors. Few kinks to still work out, but what we have so far is awesomely crisp picture to my surprise.
hehehe the bathroom sink does not seem the best place for your cable
:D
Computothought (author)  arkangel19751 year ago
True, but you have to be CAREFUL. The cable was there only long enough to create this instructable.
Piranio3 years ago
That idea just saved me a bunch of money. Bravo for doing the research to come up with this idea.