# The secondary bus

The version of the PCI Ringnode that you require depends on your computer's secondary bus. One version of the PCI Ringnode has an ISA/EISA bracket. The other has a Micro Channel bracket. The part number for each Ringnode is:

- 51-06 (PCI Ringnode with ISA/EISA bracket)

- 51-08 (PCI Ringnode with Micro Channel bracket)

| If the Ringnode you have is not the correct one for your PC, contact your supplier.