MSI MS-6551 - Connectors; Floppy Disk Drive Connector: FDD1; CD-IN1;MDM_IN1;AUX_IN1 Connectors

Hardware Setup
2-13
Floppy Disk Drive Connector: FDD1
The mainboard provides a standard floppy disk drive connector that
supports 360K, 720K, 1.2M, 1.44M and 2.88M floppy disk types.
Connectors
CD-IN1/MDM_IN1/AUX_IN1 Connectors
The connectors are for CD-ROM audio, modem with internal audio and
DVD add-on card with Line-in connection.
.
CD_IN1/MDM_IN1/AUX_IN1
FDD1
GND
Phone_In
Mono_Out
GND
L
R
GND
L
R