IBM SG24-4576-00 - Manual (Page 204)

Jumper Name: W28 - PCI IDE IRQ.
Default factory settings:
ON OFF
Change settings to:
ON OFF
+-----------+
| o---o
o |
+-----------+
1 2 3
Jumper the pins to set the PCI IDE controller as the PRIMARY IDE
controller at IRQ 14.
Remove the jumper to disable the PCI IDE. The
PCI IDE can not be set up as a SECONDARY IDE controller.
192
NetWare Integration Guide