Compaq Armada 7400 Reference Manual page 104

The computer has both an integrated mono microphone
located on the display and an external microphone jack
located on the right side of the computer. Use either of
these to record sound, enhance an interactive demonstra-
tion with high-quality stereo sound, or to take advantage
of business programs and presentation software having
audio capability.
The internal microphone is located above the middle right
of the display
microphone jack
: A non-stereo microphone is recommended. Use a
3.5 mm mono-electret condenser microphone. Plugging a stereo
microphone in the mono microphone jack is possible, but the left
channel will be recorded on both the left and right channels.
. It is disabled when the external
is used.