Asus pmn User Manual page 56

5. IDE connector (40-1 pin PRI_IDE)
This connector is for an Ultra DMA 133/100/66 signal cable. The Ultra
DMA 133/100/66 signal cable has three connectors: a blue connector
for the primary IDE connector on the motherboard, a black connector
for an Ultra DMA 133/100/66 IDE slave device (optical drive/hard disk
drive), and a gray connector for an Ultra DMA 133/100/66 IDE master
device (hard disk drive). If you install two hard disk drives, 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.
Pin 20 on the IDE connector is removed to match the covered hole on
the Ultra DMA cable connector. This prevents incorrect insertion when
you connect the IDE cable.
IDE connector
4-6
®
NOTE: Orient the red markings
(usually zigzag) on the IDE
ribbon cable to PIN 1.
PIN 1
Chapter 4: Motherboard info