Dell Dimension XPS 50 Reference Manual page 37

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Of the seven expansion-card connectors (see Figure 2-5), the brown one (AGP) is for
the AGP video card, the five beige ones (PCI1, PCI2, PCI3, PCI4, and PCI5) are for PCI
cards, and the black one (ISA1) is for an ISA card. Because connector ISA1 shares
expansion-slot space with connector PCI5, a maximum of five PCI and ISA expansion
cards can be installed.
Make sure you have a slot available for the type of card you are installing. Also check
the Windows 98 Device Manager, Windows 2000 Device Manager, or Windows NT
Diagnostics for an available interrupt request (IRQ) line that is supported by the card.
To check Windows 98 resources, perform the following steps:
1. Click the Start button, point to Settings, and click Control Panel.
2. Double-click the System icon.
8-bit ISA expansion card
16-bit ISA expansion card
32-bit PCI expansion card
AGP expansion card
Installing Upgrades on the System Board 2-11