Sun Enterprise 220R Server Service Manual

C.1.2.2 Symbios 53C876 SCSI Controller

The Symbios 53C876 SCSI controller provides electrical connection between the main logic board and the internal and external SCSI buses to the PCI bus. The Symbios controller is two SCSI controllers on the same PCI slot. Controller "A" is used to interface to internal devices. The second controller, controller "B," is used to interface to external devices.