C.3 connectors – Compaq W4000 User Manual
Page 191
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