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GigaFrog · 02-05-2002, 11:07 PM

ATX Specs from Desktop FF

Page 19 section 3.3.2. explains the PS_ON signal functionnality.
Notice that it is not necessariliy high, but may just be opened when the PSU is off. The table says Vhigh is 2V min. It also says that the PSU shall have an internal pull up, so you don't have to provide any voltage, just to release this signal from ground.

For the 5VSB, I believe you can use any ground wire. Section 3.3.3. does not say much.

Hope this help.

02-05-2002, 11:07 PM	#2
GigaFrog Cooling Neophyte Join Date: Nov 2001 Location: NorthWest (French & US) Posts: 88	ATX Specs from Desktop FF Page 19 section 3.3.2. explains the PS_ON signal functionnality. Notice that it is not necessariliy high, but may just be opened when the PSU is off. The table says Vhigh is 2V min. It also says that the PSU shall have an internal pull up, so you don't have to provide any voltage, just to release this signal from ground. For the 5VSB, I believe you can use any ground wire. Section 3.3.3. does not say much. Hope this help. __________________ Got water? Water cooled for 3 years. Safe with thermal switch. Now silent with fan thermostat.