Using PCI Cards in Slot 4

The Sun Ultra 80 Service Manual, 805-6618-11, Section C.1.3.3, says that to use a Sun Token Ring PCI card in an Ultra 80 workstation, you must install it in PCI slots 3, 2, or 1. This is true only for systems containing early Ultra 80 motherboards, and the issue may also affect some types of PCI cards other than the Token Ring.

If the Sun Ultra 80 motherboard, part number 501-5168, is at dash-level 16 or higher, then slot 4 can receive any 32-bit PCI card.

To find the motherboard part number and revision level, look at the edge of the board closest to PCI slot 1.