The ATX Power supply exchanges the two, 4 wires lead P8 and P9 leads of the AT power
supply for a single 20 wire connector. The new additions, in terms of voltages
and signals, are three +3.3V leads and a PS-ON
(Power Supply On) signal, by which
the powers supply, can be shut off or on. The drive connectors remain the same
as with the AST supply, a
combination of 4-lead mini-drive and drive connectors, providing +10 (Yellow)
and +4 (red) volts, separated by two grounds. As with all switching power
supplies, a minimum load is required for the supply to become active, i.e.
either the motherboard or a drive must be connected. The 20 pin connector
employs two rows of ten as follows (Note: Pin 1 hole is keyed as square)
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