C.P. Power Supply (What is this?)

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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)