Apple PowerBook 165 - Manual (Page 16)

Specifications I/O Interfaces - 7
Serial
Two RS-422 serial ports; mini DIN-8 connectors
Sound
Monaural sound-in port
Stereo sound-out headphone jack, which plays CD audio tracks in
stereo and computer-generated sounds in mono
Video Video-out port; 8 bit, 256 color video support
Supports Macintosh monitors up to 16-in. color and VGA monitors
Power Adapter Power adapter port
Security Slot for third-party security equipment
Modem
Slot for optional internal modem