IBM Aptiva 2198, Reference Manual

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High-performance audio adapter
If this adapter is installed in expansion slot 1, the MIDI/Joystick, Audio line
out, Audio line in, and Microphone connectors on the system board are
disabled. This disablement feature applies to this audio adapter only. The
internal speaker of the computer is also disabled during normal operation.
You must use external speakers or headphones for audio.
The following shows the connectors on the high-performance audio adapter
shipped in some models.
MIDI/Joystick
Audio line out
Audio line in
Microphone
Connector Description
Audio line-out connector Use this connector to send audio signals from the
computer to external devices, such as powered stereo
speakers (speakers with built-in amplifiers),
headphones, multimedia keyboards, or the Audio
line-in connector on a stereo system or other external
recording device.
Audio line-in connector Use this connector to receive audio signals from an
external audio device, such as a stereo system. When
you attach an external audio device, run the cable
between the Audio line-out connector of the device and
the Audio Line In connector of the computer.
Microphone connector Use this connector to attach a microphone to your
computer when you want to record voice or other
sounds on the hard disk or if you use
speech-recognition software.
MIDI/Joystick connector Use this connector to attach a joystick, gamepad, or a
Musical Instrument Digital Interface (MIDI) device such
as a MIDI keyboard.
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Aptiva Reference Guide