After you apply Serice Pack 3 to Windows 2000, or install Windows 2000 slipstreamed with Service Pack 3, some Personal Computer Memory Card International Association (PCMCIA) devices, AKA PC-Card, don't work correctly.
Windows 2000 SP3 disables PCMCIA-to-PCI IRQ routing. Some 16-bit PC Card devices require PCMCIA-to-PCI IRQ routing.
You can enable PCMCIA-to-PCI IRQ routing:
1. Use the Registry Editor to navigate to:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Pcmcia\Parameters.
2. Add Value Name DisableIsaToPciRouting, a REG_DWORD data type, and set the data value to 0.
3. Shutdown and restart your computer.
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