Apple Macintosh LC 630 - Manual (Page 102)

4 Align the card over the communication slot.
5 Press down on the card until the connector is solidly in place.
Don’t force the card. If you meet resistance, pull the card out and try again.
To see if the card is properly connected, lift it gently. If it resists and stays in
place, it’s connected.
Communication slot
Vertical plate
Communication
port access hole
94 Appendix B