Asus P4S533-VM - Manual (Page 42)

30 Chapter 2: Hardware information
3. Universal Serial Bus Ports 1 and 2 (Black, Two x 4-pin USB)
Four USB ports are available for connecting USB devices.
5. Serial Port and Header (Teal/Turquoise 9-pin COM1, 10-1 pin COM2)
One serial port can be used for pointing devices, printers or other serial
devices. An onboard header supports a serial bracket. To enable these
ports, see Onboard Serial Port 1 in 4.4.2 I/O Device Configuration for
the settings.
4. Parallel Port (Burgundy 25-pin PRINTER)
You can enable the parallel port and choose the IRQ through Onboard
Parallel Port (see 4.4.2 I/O Device Configuration).
Universal Serial Bus (USB)
COM 1
Serial Port (9-pin male)
Parallel (Printer) Port (25-pin female)
NOTE! Serial printers must be connected to the serial port.