Universal disk array controller

A disk array controller is configured to communicate with the PCI-based host computer with a known standard PCI protocol. The standard PCI protocol typically defines a message provided for the disk array controller to negotiate with the PCI-based host computer. The message is represented by the PCI class code. By programming the PCI class code register in the PCI configuration space register (offset address 09H-0BH) with appropriate hex codes, the disk array controller will be identified as a stand PCI bus master IDE controller, and can be driven by the PCI bus master IDE controller driver utility, which is built in most of the PC-based operating system.