1.10.2 Internal connectors Asus prime Asus M3A78

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Audio 2, 4, 6, 8-channel configuration

Ensure that the audio device of Sound playback is VIA High Definition Audio (the name 

may be different based on the OS). Go to Start > Control Panel > Sounds and Audio 

Devices > Sound Playback to configure the setting.

Port

Headset 2-channel

4-channel

6-channel

8-channel

Light Blue

Line In

Line in

Line in

Line in

Lime

Line Out

Front Speaker Out

Front Speaker Out

Front Speaker Out

Pink

Mic In

Mic In

Mic in

Mic in

Orange

-

-

Center/Subwoofer

Center/Subwoofer

Black

-

Rear Speaker Out

Rear Speaker Out

Rear Speaker Out

Gray

-

-

-

Side Speaker Out

10.  USB 2.0 ports 1 and 2. These two 4-pin Universal Serial Bus (USB) ports are 

available for connecting USB 2.0 devices.

11.  USB 2.0 ports 3 and 4. These two 4-pin Universal Serial Bus (USB) ports are 

available for connecting USB 2.0 devices. 

12.  COM port. This 9-pin COM1 port is for pointing devices or other serial devices.
13.  Optical S/PDIF Out port. This port connects an external audio output device via an 

optical S/PDIF cable.

14.  USB 2.0 ports 5 and 6. These two 4-pin Universal Serial Bus (USB) ports are 

available for connecting USB 2.0 devices.

1.10.2 

Internal connectors

1. 

Floppy disk drive connector (34-1 pin FLOPPY)
This connector is for a Floppy Disk Drive (FDD) signal cable. Insert one end of 

the provided FDD cable to this connector, then connect the other end to the signal 

connector at the back of the floppy disk drive.

Pin 5 on the connector is removed to prevent incorrect cable connection when using an 

FDD cable with a covered Pin 5.

M3A78 

Floppy Disk Drive Connector

R

M3A78

NOTE: Orient the red markings on

the floppy ribbon cable to PIN 1.

PIN1

FLOPPY

Chapter 1: Product introduction

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