Apple PC Compatibility Card (Installation) - Manual (Page 43)

5 Insert the small end of the internal PC audio/video assembly into the socket in the corner
of the PC Compatibility Card.
6 Fold the slack in the internal PC audio/video assembly into the shape of an L on top of
the card. Firmly pinch the fold as shown below.
IMPORTANT Do not press down too hard on the top of the card. Applying
excessive pressure to the card may damage the card and your logic board.
Fold the cable in an L shape and pinch it firmly here.
Socket
43 Installing the PC Compatibility Card in a 6400 Series Macintosh Computer