Apple Macintosh Performa 6300CD Series - Manual (Page 41)

Connecting an Apple PlainTalk Microphone
Your computer has a sound input port, which you can use to connect an Apple
PlainTalk Microphone. The Apple PlainTalk Microphone is included with
some computer models. If your computer did not include an Apple PlainTalk
Microphone, you can purchase one at an Apple-authorized dealer.
Use PlainTalk only: You should connect only the Apple PlainTalk
Microphone. Other models of microphone will not work with your
Macintosh.
To connect the microphone, do this:
m Plug the microphone’s connector into the sound input port (marked with the icon X )
on the back of the computer.
Sound
input port Sound
output port
31 Connecting Additional Equipment