Asus P4BGL-MX - Manual (Page 22)

1-12 Chapter 1: Motherboard Information
1.11 Connectors
This section describes and illustrates the connectors on the motherboard.
1. IDE connectors (40-1 pin PRI_IDE, SEC_IDE)
This connector supports the provided UltraDMA100/66 IDE hard disk
ribbon cable. Connect the cable’s blue connector to the primary
(recommended) or secondary IDE connector, then connect the gray
connector to the UltraDMA100/66 slave device (hard disk drive) and
the black connector to the UltraDMA100/66 master device. It is
recommended that you connect non-UltraDMA100/66 devices to the
secondary IDE connector. If you install two hard disks, you must
configure the second drive as a slave device by setting its jumper
accordingly. Refer to the hard disk documentation for the jumper
settings. BIOS supports specific device bootup. If you have more than
two UltraDMA100/66 devices, purchase another UltraDMA100/66
cable. You may configure two hard disks to be both master devices
with two ribbon cables – one for the primary IDE connector and
another for the secondary IDE connector.
Pin 20 on each IDE connector is removed to match the covered hole
on the UltraDMA cable connector. This prevents incorrect orientation
when you connect the cables.
For UltraDMA100/66 IDE devices, use an 80-conductor IDE cable.
P4BGL-MX
P4BGL-MX IDE Connectors
NOTE: Orient the red markings
(usually zigzag) on the IDE
ribbon cable to PIN 1.
SEC_IDE
PIN 1
PRI_IDE