4.Floppy disk drive connector (34-1 pin FLOPPY)

This connector supports the provided floppy drive ribbon cable. After connecting one end to the motherboard, connect the other end to the floppy drive. (Pin 5 is removed to prevent incorrect insertion when using ribbon cables with pin 5 plug).

PIN 1 FLOPPY

NOTE: Orient the red markings on the floppy ribbon cable to PIN 1.

P4B-E

P4B-E Floppy Disk Drive Connector

Figure 2-38 Floppy Disk Drive Connector

5.Chassis open alarm lead (4-1 pin CHAS1)

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.

If you do not wish to use the chassis intrusion lead, place a jumper cap over the pins labeled “Chassis Signal” and “Ground” to close the circuit.

P4B-E

P4B-E Chassis Alarm Lead

CHAS1

+5VSB MB

Chassis Signal GND

1

 

Figure 2-39 Chassis Alarm Lead

ASUS P4B-E motherboard user guide

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