Apple Power Macintosh 8600 - Manual (Page 84)

The S-video input and output ports accept this type of connector:
Note: The S-video input port is compatible with both seven-pin and four-pin
S-video connectors.
IMPORTANT The S-video connector is a round plug with several small metal
pins, which resembles other Macintosh connectors, such as those for a printer,
modem, mouse, or keyboard. Don’t confuse the connectors; they’re not
interchangeable.
The composite video input and output ports accept this type of connector:
Connecting video equipment for input to the computer
When you connect video equipment to the video input port on your computer,
you can view video on your monitor, capture video images, and hear the
sound from the video equipment through the computer’s speaker. The
instructions that follow are for connecting a stereo VCR and video camera,
but you can use them as a model for connecting your computer to any video
equipment.
RCA-type plug
S-video connector
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