Asus M2V - Manual (Page 44)

2-22 Chapter 2: Hardware information
7. USB 2.0 ports 3 and 4. These two 4-pin Universal Serial Bus (USB)
ports are available for connecting USB 2.0 devices.
. USB 2.0 ports 1 and 2. These two 4-pin Universal Serial Bus (USB)
ports are available for connecting USB 2.0 devices.
9. External Serial ATA 3Gb/s port. This port connects to an external
SATA box or a Serial ATA port multiplier.
10. S/PDIF coaxial out port. This port connects to external audio output
devices with coaxial cable connectors.
11. PS/2 keyboard port. This purple connector is for a PS/2 keyboard.
The external SATA port supports
external Serial ATA 1.5Gb/s and
3Gb/s devices. Longer cables
support higher power requirements
to deliver signal up to two meters
away, and enables improved hot-
swap function.
Do not insert a different connector
to this port.