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Keyboard (XT)

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5 PIN DIN 180 (DIN41524) FEMALE (At the computer)

5 PIN DIN 180° (DIN41524) FEMALE at the computer.

Pin Name Description Technical
1 CLK Clock CLK/CTS, Open-collector
2 DATA Data RxD, Open-collector
3 /RESET Reset  
4 GND Ground  
5 VCC +5 VDC  

Clock

This signal is sent from the keyboard to synchronise the data signal.

Data

Keyboard scan codes are sent from the keyboard to the computer on this single wire serially.

Reset

This 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 Vdc

This is a simple 5 volts signal for giving power to the keyboard.

Ground

This is a common ground signal used as a return path for data and is a reference to logical 0.


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