1.10.2 Internal connectors Asus prime Asus M3A78

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ASUS M3A78

1-27

3.  IDE connector (40-1 pin PRI_IDE)

The onboard IDE connector is for an Ultra DMA 133/100/66 signal cable. 

There are three connectors on each Ultra DMA 133/100/66 signal cable: 

blue, black, and gray. Connect the blue connector to the motherboard’s IDE 

connector, then select one of the following modes to configure your device(s).

•  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.

•  Use the 80-conductor IDE cable for Ultra DMA 133/100/66 IDE devices.

If any device jumper is set as “Cable-Select,” make sure all other device 

jumpers have the same setting.

Drive jumper setting

Mode of 

device(s)

Cable connector

Single device

Cable-Select or Master

-

Black

Two devices

Cable-Select

Master

Black

Slave

Gray

Master

Master

Black or gray

Slave

Slave

M3A78 IDE Connector

R

M3A78

NOTE: Orient the red markings

(usually zigzag) on the ID

ribbon cable to PIN 1.

PRI_IDE

PIN1