Apple Power Macintosh 9600 - Manual (Page 79)

The computer’s sound input and output ports accept these 3.5-mm
connectors:
The “stereo miniplug” is the smaller of the two and is found most often on
stereo equipment. The extended miniplug, which is slightly longer and is
found on voice quality microphones (such as the Apple PlainTalk
Microphone), works only in your computer’s sound input port (≈). (Even
though it will fit into the sound output port, it won’t work there.) If your
equipment has a different type of connector from those shown here, you can
purchase an adapter at an electronics supply store.
Connecting most audio equipment
To connect most audio equipment, follow the steps below. For specific
instructions on connecting a microphone, skip to the next section,
“Connecting and Positioning a Microphone.”
1 Make sure that the audio equipment has a cable with a stereo miniplug connector.
2 Place the audio equipment near the computer.
3 Shut down the computer and turn off the audio equipment.
4 Attach cables to the audio equipment following the instructions that came with the
equipment.
Some equipment (such as most headphones) comes with cables already
attached.
Stereo miniplug
RCA
Extended miniplug Stereo miniplug
79 Connecting Additional Equipment