HP Compaq dc7100 DT Technical Reference Manual page 209

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
3 4
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
Pin Function
1 +5 VDC
2 Data (-)
3 Data (+)
4 Ground
Figure C-10. USB Keyboard Cable Connector (Male)
Technical Reference Guide
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361834-002
Keyboard
C-17