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(At the computer)
5 PIN DIN 180° (DIN41524) FEMALE at the computer.
ClockThis signal is sent from the keyboard to synchronise the data signal.
DataKeyboard scan codes are sent from the keyboard to the computer on this single wire serially.
ResetThis signal is rarely used and many keyboards don't even connect it. It was used to let the computer reset the keyboard. The PS/2 design from IBM even abandonned it from it's new connector.
+5 VdcThis is a simple 5 volts signal for giving power to the keyboard.
GroundThis is a common ground signal used as a return path for data and is a reference to logical 0.