Key Board Connector

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Keyboard and Mouse ports PS/2 - ATX Keyboard and Mouse Most ATX machines also have USB port and can support input devices using that port. Connector : female MiniDIN6
Pin	Name	Description
1	Data	Data
2	RST	Reset (not used)
3	GND	Ground
4	Vcc	+5V (fused)
5	CLK	Clock
6	NC	Not connected
S	NC	Not connected
KB - AT Keyboard On AT machines, the mouse is usually connected using a COM (Serial) port, or on some newest ones, using a PS/2 mouse port. Connector : female DIN5
Pin	Name	Description
1	CLK	Clock
2	Data	Data
3	RST	Reset (not used)
4	GND	Ground
5	Vcc	Vcc (fused)
S	NC	Not connected

KB - XT Keyboard On ATX machines, the mouse is connected using a COM (Serial) port. Connector : female DB9
D	Description	Name	Pin
?	?	? (DCD ?)	1
?	?	? (RX ?)	2
?	?	? (TX ?)	3
?	?	? (DTR ?)	4
	NC	NC	5
	NC	NC	6
	NC	NC	7
Key (Pin 8)
?	? (RI ?)	?	9
/	GND	Chassis Ground	S
Note: names between () are from a Serial connector. This is just an idea, but as many XT keyboard have only these 5 pins, they could be using the same interface as a COM port.