IBM Motherboard User Manual page 19

Motherboard Users Guide
Follow the steps below to install an CNR/PCI expansion card.
1. Locate the CNR or PCI slots on the mainboard.
2. Remove the blanking plate of the slot from the system chassis.
3. Install the edge connector of the expansion card into the slot. Ensure the
edge connector is correctly seated in the slot.
4. Secure the metal bracket of the card to the system chassis with a screw.
CNR Slot (Optional)
You can install the CNR (Communications and Networking Riser) cards in this slot,
including LAN, Modem, and Audio functions.
PCI Slots
You can install the 32-bit PCI interface expansion cards in the slots.
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