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12V only power connector (labelled P1, though it is not compatible with the ATX 20 or 24 pin connector): This is a 10 or 16-pin Molex connector supplying the motherboard with three or six 12 V lines with common returns, a 'supply OK' signal, a 'PSU ON' signal and a 12 or 11 V auxiliary supply. One pin is left unused.
Fix label on pin 8 and add 1 or 2 after +12V text to match official spec, center text inside each pin, change text to approved Wikipedia font family. 15:07, 13 February 2013 378 × 750 (33 KB)
PS-ON Signal is a pin on a 20-pin or 24-pin ATX-specified power connector used to turn a personal computer power supply unit on/off. The PS_ON pin is normally pulled high in an open-circuit, but will turn on the power supply when it is pulled low, by shorting it to the common signal (COM). Conversely the power supply is turned off when the PS ...
An ATX power supply provides a number of peripheral power connectors and (in modern systems) two connectors for the motherboard: an 8-pin (or 4+4-pin) auxiliary connector providing additional power to the CPU and a main 24-pin power supply connector, an extension of the original 20-pin version. 20-pin Molex 39-29-9202 at the motherboard. 20-pin ...
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ATX12VO power supply connector Color Signal Pin Pin Signal Color Green PS_ON# 1 6 PWR_OK: Gray Black COM 2 7 +12 VSB Purple Black COM 3 8 +12 V1 DC Yellow Black COM 4 9 +12 V1 DC Yellow TBD Reserved 5 10 +12 V1 DC Voltage Sensing Pin Yellow
The most notable difference from modern 20/24-pin ATX power connectors is that the AT power supply connector did not have a signal to turn on the power supply, and also did not supply separate, "always-on" +5V standby power. The power supply was instead turned on and off via a mechanical switch that disconnected mains power. Modern, ATX ...
The ATX specification requires that the power-good signal ("PWR_OK") go high no sooner than 100 ms after the power rails have stabilized, and remain high for 16 ms after loss of AC power, and fall (to less than 0.4 V) at least 1 ms before the power rails fall out of specification (to 95% of their nominal value).