Dell Dimension XPS 50 Reference Manual page 39

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3. Choose an expansion-card connector for the card.
NOTE: The ISA1 connector and the PCI5 connector share a single card-slot open-
ing, so only one of these connectors can be used at any given time.
4. Unscrew and remove the metal filler bracket that covers the card-slot opening for
the expansion slot you intend to use (see Figure 2-7).
filler bracket
5. Insert the expansion card firmly into the expansion-card connector.
Cutouts in the card-edge connector align with crossbars in the expansion-card
connector. Gently rock the card into the connector until it is fully seated (see
Figure 2-8). If the expansion card is full-length, insert the front end of the card
into the corresponding card guide at the front of the chassis as you insert the
card into its connector.
Installing Upgrades on the System Board 2-13