Asus P4-P5N9300 - Manual (Page 38)

3-6 Chapter 3: Motherboard info
3.4 Connectors
1. Serial ATA connectors (9-pin SATA1, SATA2)
These connectors are for the Serial ATA signal cables for Serial ATA hard disk
drives.
• Install Windows ® XP Service Pack 1 before using Serial ATA hard disk
drives.
• When using the connectors in IDE mode, connect the primary (boot) hard disk
drive to the SATA1 or SATA2 connector.
2. COM port connector (10-1pin COM1)
This connector is for a serial (COM) port. Connect the serial port module
cable to this connector, then install the module to a slot opening at the back
of the system chassis.