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Appendix C Keyboard
C.3 CONNECTORS
Two types of keyboard interfaces are used in 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:
Pin Function
1 Data
2 Not connected
3 Ground
4 +5 VDC
5 Clock
6 Not connected
1 2
3 4
5 6
Figure C–9. PS/2 Keyboard Cable Connector (Male)
Pin Function
1 +5 VDC
2 Data (+)
3 Data (-)
4 Ground
4 3 2 1
Figure C–10. USB Keyboard Cable Connector (Male)
Compaq Personal Computers
Changed - July 2000
C-16