Apple Power Macintosh 5400 series - Manual (Page 155)

Installing a communication card
This section contains instructions for installing an Ethernet, fax, or internal
modem card in the communication slot in your computer.
Some communication cards designed for other communication slots are not
compatible with your computer and cannot be installed in its communication
slot. Use the following illustration as a guide to determine if you have the
correct type of card for the slot.
Vertical plate
Compatible
Compatible
Notches
Logic board
(side view)
Communication slot
Communication card
Notches
Not compatible
Notches
143 Installing Expansion Cards and Additional Memory