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AT Power supply jumper

L

Larz

Junior Member
I know I saw it somewhere, sometime, but I can't find it. I want to turn an old AT class case into an external SCSI drive array.
Got a card, working on an internal-external SCSI cable to hook up the drives in the case.
What I need to know is how to "trick" the AT power supply into thinking there is a happy motherboard plugged in.
ATX is just short the green and black wires.
Anybody know the way to do it to an AT? or should I just leave an old MB in there as a voltage checker?


Thanks all!!!
 
You don't have to do anything to emulate a mobo with an AT PSU. The "power good" signal originates in the PSU and triggers a reset of the mobo. IOW, there is no signal that originates on the mobo to be received by the PSU. As long as you have at least a 1 Amp load on both the +5 and +12V lines your PSU should be happy. A bunch of SCSI drives should do that easily.
.bh.
😎
 
AT supplies had a cable with 2-4 wires coming out of the powersupply that hooked up to an on/off switch on the front of the case.
 
Zepper,

That might explain why all I could find was how to trick the ATX style...<BG>
My controller was shipped already...bought it here...now I have to buy some drives for the array.
Found 4 23G as a package deal on fleabay, gonna look around and see what else I can come up with.

Thanks for the info!!!
 
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