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Technical Reference Guide
Compaq Personal Computers
Changed –- March 2000
C-15
C.3 CONNECTORS
Two types of keyboard interfaces are used in Compaq systems: PS/2-type and USB-type. Systems
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 the
Input/Output chapter of this guide. The keyboard cable connectors and their pinouts are described
in the following figures:
Pin Function
1Data
2 Not connected
3 Ground
4+5 VDC
5Clock
6 Not connected
Figure C–8.
PS/2 Keyboard Cable Connector (Male)
Pin Function
1+5 VDC
2 Data (+)
3 Data (-)
4 Ground
Figure C–9.
USB Keyboard Cable Connector (Male)
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