blanning wrote:
Nlandas wrote:
Please don't destroy a working A500/A1200 Power Supply - The French Amiga Repair Center has the ends necessary to make adapters available for around 5. They shipped me one quickly and I built an ATX to A500/A1200 adapter with it and some inexpensive wire.
Is there a site that shows the wiring diagram for this? How do you fool an atx power supply into thinking there's a motherboard there?
RKauser beat me to it - Here's the quick guide.
Tools - Soldering Iron/solder, Good guage wire, A500/A1200 power connector, volt meter, electrical tape and possible cable wrap or something else to sheath the wires.
(I used an ATX-20 to ATX-24 adapter and cut off the ATX-24 end and used the cables from the ATX-20 end. You can just cut the wires coming out of the PS.)
1.) Open the connector to expose the solder points.
2.) Double and triple check the
guide to get the correct wire map down.
3.) Strip the wires on both ends of the wire. (Twist well together if they aren't solid core.
4.) Solder the wires to the correct pins of the A500/A1200 connector using the supplied guide. (Double check the connection.)
I found it helpful at this point to write down a quick little color code chart for my wires. You know like red goes to +5V, Yellow to +12, etc. Depends on the color of the wires you were able to acquire. You might also mark them with tape.
4 1/2.) You may need to install your wire sheath at this point unless you use wire wrap or some other kind of split cover.
5.) Now using the guide locate the ATX wires that offer the correct voltage output and use a volt meter to confirm. Cut these wires loose and strip.
6.) Tin the leads and join the correct ATX wires to your cable wires.
7.) Double check continuity on your cable using the volt meter and make sure the pins go where you think.
8.) Now you need to make the ATX power supply turn on. With most of them you can simply hard wire PS-ON(Green I think) to GND(black). The PS needs to have a load on it but the A1200 should be enough. The guide has a circuit for some stuborn PSs that won't turn on.
9.) Now test you cable and make sure the correct voltages are coming out the correct pins. (Triple check and wiggle the ends)
10.) Assemble it all together in the manner that you've decided.
11.) Test it with your A500/A1200.
The advantage of using the ATX-20 to ATX-24 pin adapter is that you end up with a cable that can be moved from ATX PS to ATX PS, so that if your PS dies you can just use another one.
You also end up with many cables left over that would actually allow you to add additional A500/A1200 ends and power multiple units. ;^)
I hope this helps get you started. I know it's not as detailed as it could be. -Nyle
EDIT: I'd show a picture of my adapter cable but my skin isn't think enough today to deal with the multiple critics here who'd tell me I could have done it better.
