HP Kayak XA-s 02xx Technical Information Manual page 14

Front Panel Microphone
Connector
HP Kayak XA-s 02xx PC Workstation - Technical Information for Minitower Models
System Connectors and Switches
The Front Panel Microphone Connector, labeled "Front Panel Micro," is
a 3-pin connector. The Audio signal from this connector is directly
mixed with the signal from the rear panel Microphone jack. The
connector has the following pin assignments:
Pin
1 MIC signal + power (tip)
2 Analog Ground
3 MIC signal + power (ring)
14 English
Signal
IN
I/O