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Many Amiga computers utilitize the PCI (Peripheral Component Interconnect) local bus standard. Many more support the PCI Express (Peripheral Component Interconnect Express) local bus standard. No matther which flavour of PCI is in use, the pci interface is the way to utilize them.
The Interface and its Functions
Expansion Library contains the "pci" interface. Therefore, you must first open Expansion Library and then obtain the pci interface in order to access the functions.