Asus PCH-DL - Manual (Page 46)

2-28 Chapter 2: Hardware information
8. Chassis intrusion connector (4-1 pin CHASSIS1)
This lead is for a chassis designed with intrusion detection feature.
This requires an external detection mechanism such as a chassis
intrusion sensor or microswitch. When you remove any chassis
component, the sensor triggers and sends a high-level signal to this
lead to record a chassis intrusion event.
By default, the pins labeled “Chassis Signal” and “Ground” are shorted
with a jumper cap. If you wish to use the chassis intrusion detection
feature, remove the jumper cap from the pins.
PCH-DL
PCH-DL Chassis Intrusion Connector
CHASSIS1
(Default)
+5VSB_MB Chassis Signal GND
PCH-DL
PCH-DL IEEE-1394 Connector
IEEE1394_1
1
TP
A0-
GND TPB0- +12V GND
TP
A0+
GND
TPB0+
+12V
9. IEEE 1394 connector (10-1 pin IEEE1394_1)
This connector is for a 1394 module. Attach the 10-1 pin 1394 cable
plug from the module to this connector. You may also connect a 1394-
compliant internal hard disk to this connector.