PC/AT,PC/XT键盘接口

普通的键盘接口为5针母插座：

 

键盘接口引脚定义

PC/XT 键盘接口管脚定义：

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

PC/AT 键盘接口引脚定义表：

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