Apple Power Macintosh (7100 Series) - Manual (Page 127)

8 Align the card over the slot.
9 Press down gently but firmly on the card until the connector is fully inserted.
Don’t force the card. If you meet a lot of resistance, pull it 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. (Make sure you don’t lift the card so much that you
accidentally disconnect the card.)
If you have other cards to install, put them in now by repeating steps 5
through 9.
Slide the metal
end of the card
between the
two tabs.
Connector
NuBus slot
117 Installing an Expansion Card