![]() 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. These supplied +5V, +12V, −5V, −12V, "power-good signal", and ground. Older, AT motherboards utilized two connectors, commonly referred to as "P8" and "P9" that were positioned directly next to each other. Power on is internally driven high, and shorting this pin to ground will turn on the power supply.ĪT motherboard power connector (P8 & P9 connector, Molex 90331) Power good goes high to indicate that voltages are stabilised and ready for use.
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