Hardware pinouts information and cables schemes

AT Keyboard (old style) PC pinout

connector or cable wiring scheme

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Pin Name Description Technical
1 CLOCK Clock CLK/CTS, Open-collector
2 DATA Data RxD/TxD/RTS, Open-collector
3 n/c Not connected Reset on some very old keyboards.
4 GND Ground  
5 VCC +5 VDC  

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Pinouts.ru > Input devices (keyboards, mices, joysticks) pinouts > Pinout of Keyboard (old style) PC and layout of 5 pin DIN female connector
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Source(s) of this and additional information: Hardware Book
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