HP Compaq dx7300 and dc7700 Business PC Technical Reference Guide, 1st Edition

Technical Reference Guide www.hp.com C-17
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:
Figure C-9. PS/2 Keyboard Cable Connector (Male)
Figure C-10. USB Keyboard Cable Connector (Male)
Pin Function
1Data
2 Not connected
3Ground
4+5 VDC
5Clock
6 Not connected
Pin Function
1+5 VDC
2 Data (-)
3 Data (+)
4Ground
6 5
4 3
2 1
1 2 3 4