Asus M2N68 PLUS - Manual (Page 27)

7. USB 2.0 ports 1 and 2. These two 4-pin Universal Serial Bus (USB) ports are
available for connecting USB 2.0 devices.
8. USB 2.0 ports 3 and 4. These two 4-pin Universal Serial Bus (USB) ports are
available for connecting USB 2.0 devices.
9. COM port. This 9-pin COM1 port is for pointing devices or other serial devices.
10. PS/2 keyboard port. This port is for a PS/2 keyboard.
1.10.2 Internal connectors
1. Speaker connector (4- pin SPEAKER)
This 4-pin connector is for the chassis-mounted system warning speaker. The speaker
allows you to hear system beeps and warnings.
2. Optical drive audio connector (4-pin CD)
This connector allows you to receive stereo audio input from sound sources such as a
CD-ROM, TV tuner, or MPEG card.
Chapter 1: Product introduction 1-17