NEC 2000 Series - Manual (Page 16)

Reviewing System Features 1-7
Left side features
A – PC Card Slot 1 F – Microphone In Jack
B – Slot 1 Card Eject Button G – Line In Jack
C – Slot 2 Card Eject Button H – Headphone Jack
D – PC Card Slot 2 I – Volume Control
E – Fan J – System Unit
Audio Connectors
The system unit has the following audio connectors:
T Microphone in jack
Use this jack to connect a microphone for recording audio information
in your data files.
T Line in jack
Use this jack to connect a stereo audio device such as a stereo
amplifier or a cassette for playback or recording.
T Headphone jack
Use this jack to connect an optional headphone set. Plugging in the
headphone set disables the built-in system speakers.