Apple Macintosh PowerBook 190 Series - Manual (Page 74)

Connecting sound output devices
Your computer has a built-in microphone to the lower right of the display. For
information on using the microphone to record sounds, see the “Sound” topic
of Macintosh Guide, available in the Guide (h) menu.
The Macintosh PowerBook also has a stereo sound output port (marked with
the icon -) to which you can connect externally powered speakers, an
amplifier, headphones, or other audio output devices. The sound output port
accepts a standard stereo miniplug, like that used to attach headphones to a
portable tape player.
Microphone
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