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#1
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Puzzling ATX to AT power supply converter
Hallo,
I recently acquired a cable which apparently should make it possible to use an ATX power supply in an older AT-case. However, I am not quite sure of how to install it since in addition to the expected standard AT and ATX connectors there is also a 3-pin connector which looks somewhat like a smaller version of a floppy power supply plug. I guess it should have something to do with the power on/off button but I don't really see how it could be fitted. Does anyone have any idea what it could be used for? Thanks. //Regards, Johan |
#2
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Johan Ericsson wrote:
I recently acquired a cable which apparently should make it possible to use an ATX power supply in an older AT-case. However, I am not quite sure of how to install it since in addition to the expected standard AT and ATX connectors there is also a 3-pin connector which looks somewhat like a smaller version of a floppy power supply plug. I guess it should have something to do with the power on/off button but I don't really see how it could be fitted. Does anyone have any idea what it could be used for? It doesn't look like http://www.pcpowercooling.com/produc...xtoatcable.htm What color are the wires, and where do they come from? |
#3
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I see now that we are talking about an adaptor. I misread and thought you
were pseaking of a lead coming from an ATX power supply and you didn't know how to connect it to you ATX/AT adaptor. Whoops! Johan Ericsson wrote in message om... Perhaps it's a power supply cooling fan trigger wire? I have two power supplies that come with three-wire sensor fans that can be throttled up and down when this extra lead very similar to what you describe is connected to the motherboard. Hmm..maybe, but since it is connected to the power-on signal line to the PSU I don't really see how it would work. file://Regards, Johan. |
#4
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Johan Ericsson wrote:
It doesn't look like http://www.pcpowercooling.com/produc...xtoatcable.htm No, it doesn't. The long wires on that one appear to connect to the old AT power switch quite nicely. What color are the wires, and where do they come from? The wires are colored brown, gray and black. They appear to be connected to ground, PS_ON and +5vdc (standby voltage) so it seems that the connector has something to do with the activation of the power supply. Here is a complete sketch of the wiring, as seen from the end of the connectors where the cables emerge: http://www.algonet.se/~warnut/atxtoat.jpg Whew! I don't know. It looks like some sort of turn on circuit using the +5vsb as a pull up (not needed since pin 14 has internal pull up), or the +5vsb is the Vcc in some sort of proprietary circuit. I vote for the latter. Get the PCP&C device, or build your own interface to the on/off switch. |
#5
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I have seen these also. There were two different models of converter. They
came with early ATX cases so you could put a regular AT motherboard in them. I saved the converters and found they were power supply/case specific later. One was just a converter with no extra wires, I think the manual ATX power switch on the back turned on the power to the AT motherboard. Don't ask me how. On the other, it had extra leads and connected to the ATC momentary on contact switch. Basically useless without the case but you know how you can hoard leftover parts... "Johan Ericsson" wrote in message om... Hallo, I recently acquired a cable which apparently should make it possible to use an ATX power supply in an older AT-case. However, I am not quite sure of how to install it since in addition to the expected standard AT and ATX connectors there is also a 3-pin connector which looks somewhat like a smaller version of a floppy power supply plug. I guess it should have something to do with the power on/off button but I don't really see how it could be fitted. Does anyone have any idea what it could be used for? Thanks. //Regards, Johan |
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