The output of the banner command appears as follows, indicating that it is a PCI-based system.
ok banner Sun (TM) Enterprise 250 UPA/PCI (UltraSPARC-II 296MHz), No Keyboard OpenBoot 3.7, 128 MB memory installed, Serial #8941639. Ethernet address 8:0:20:88:70:47, Host ID: 80887047.