Asus CUSL2 CUSL2 User Manual - Page 28

3. HARDWARE SETUP Interrupt Request Table for this Motherboard Interrupt requests are shared as shown by the following table: PCI slot 1 PCI slot 2 PCI slot 3 PCI slot 4 PCI slot 5 PCI slot 6 Onboard VGA Onboard USB controller HC0 Onboard USB controller HC1 AGP Pro CNR LAN CNR Audio/Modem ABCDE FGH - - - - - shared not shared shared - - - - shared shared - - - - not shared - - - - - shared not shared shared shared shared - - - - not shared - - - - - - IMPORTANT: If using PCI cards on shared slots, make sure that the drivers support "Share IRQ" or that the cards do not need IRQ assignments. Conflicts will arise between the two PCI groups that will make the system unstable or cards inoperable. 3.7.3 Communication and Networking Riser (CNR) Slots These connectors support specially designed network, audio, or modem riser cards. Main processing is done through software and controlled by the motherboard's system chipset. This provides upgradeable network, audio, and/or modem solutions at an incredibly low cost. NOTE: CNRs are not included with this motherboard. 3. H/W SETUP Expansion Cards ® CUSL2 CUSL2 Communication & Networking Riser Connectors CNR Restrictions: 1. Only one audio CNR can be used, and it must be primary and inserted into CNR slot 1. 2. If both an audio CNR and modem CNR are used, the modem CNR must be secondary. 3. The modem CNR must be primary if no audio CNR is used. 4. Only one LAN CNR can be supported. 5. When a USB hub CNR card is used, USB ports 5 and 6 will not function. 28 ASUS CUSL2 User's Manual