HP dc71xx Manuale Utente

Two types of keyboard interfaces may be used in HP/Compaq systems: PS/2-type and USB-type. 
System units that provide a PS/2 connector will ship with a PS/2-type keyboard but may also 
support simultaneous connection of a USB keyboard. Systems that do not provide a PS/2 
interface will ship with a USB keyboard. For a detailed description of the PS/2 and USB 
interfaces refer to Chapter 5 “Input/Output” of this guide. The keyboard cable connectors and 
their pinouts are described in the following figures:

1

Data

2

Not connected

3

Ground

4

+5  VDC

5

Clock

6

Not connected

1

+5  VDC

2

Data (-)

3

Data (+)

4

Ground

 

6 

5 

4 

3 

2 

1 

 

1 

2 

3 

4