Keyboard
C.3 Connectors
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:
5 6
34 
1 2 
Pin | Function |
| |
1 | Data |
| |
2 | Not connected |
| |
3 | Ground |
| |
4 | +5 VDC |
| |
5 | Clock |
| |
6 | Not connected |
Figure C-9. PS/2 Keyboard Cable Connector (Male)
4 
3 
2 
1
Pin Function
1+5 VDC
2Data (-)
3Data (+)
4Ground
Figure C-10. USB Keyboard Cable Connector (Male)
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