Stereo Line-In Jack - Compaq Armada 4100 Reference Manual

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Stereo Line-In Jack

The stereo line-in jack is the input line for devices such as a CD
player, tape player, or tuner. The input device must supply levels
compliant with the line input level specification of 0.5 to 4.25 volts.
The line output of most devices meets this specification.
Make sure you plug in a stereo component only to your computer. A
stereo connector has a colored band. The mono plug does not.
Stereo Plug Versus Mono Plug
8-4 Enjoying Compaq Audio
CAUTION: Use only a 3.5-mm stereo plug in the stereo line-in
jack, which has a colored band around the connector post. A
mono plug used in the stereo line-in jack may damage the input
device.