Using The Portable Cd-Rom Docking System; Audio Input - Texas Instruments TravelMate 4000M User Reference Manual

Using the Portable
CD-ROM Docking System
Software has been pre-loaded on your hard drive that
configures your notebook for the microphone and
headphone. To plug in your microphone, insert the plug
into the Mic connector on the front of the Portable CD-ROM
Docking System. The headphones may be plugged in either
at the CD-ROM player (un-mixed sound) or at the portable
docking system (mixed sound)s.

Audio Input

You can plug in external audio sources through ports on
the Portable CD-ROM Docking System. External sources
may include:
12-10 Portable CD-ROM Docking System
Microphone and headphone connections
Musical instruments - Line in port
Tape players - Line in port
Mixers - Line in port
Microphones - Microphone port