Intel AX965Q User Manual page 45

1.8.2.8 Serial Port Connector 3 (COM3)
1.8.2.9 Serial Port Connector 4 (COM4)
1.8.2.10 Floppy Disk Drive Connector (FLOPPY)
Pin 5 on the connector is removed to prevent incorrect cable
connection when using a FDD cable with a covered Pin 5.
Orient the red markings on the floppy ribbon cable to Pin 1.
User's Manual
ATX Main board 45