Computer Computer Hardware User Manual

2-14

MS-9802 Mainboard

Serial Port Connector: COM3, COM4

The mainboard provides two 9-pin headers as serial ports. These ports are 16550A

high speed communication port that sends/receives 16 bytes FIFOs. You can attach

a serial mouse or other serial devices directly to them.

PIN SIGNAL DESCRIPTION

1 DCD Data Carry Detect

2 SIN Serial In or Receive Data

3 SOUT Serial Out or Transmit Data

4 DTR Data Terminal Ready

5 GND Ground

6 DSR Data Set Ready

7 RTS Request To Send

8 CTS Clear To Send

9 VCC_COM3 Power Source

Pin Definition

Front USB Connector: F_USB1

The mainboard provides one USB 2.0 pinheader that is compliant with Intel

I/O

Connectivity Design Guide. USB 2.0 technology increases data transfer rate up to a

maximum throughput of 480Mbps, which is 40 times faster than USB 1.1, and is ideal

for connecting high-speed USB interface peripherals such as USB HDD, digital

cameras, MP3 players, printers, modems and the like.

F_USB1

10 9

PIN SIGNAL PIN SIGNAL

1 VCC 2 VCC

3 USB0- 4 USB1-

5 USB0+ 6 USB1+

7 GND 8 GND

9 Key (no pin) 10 USBOC

Pin Definition

Important

Note that the pins of VCC and GND must be connected correctly to avoid

possible damage.

COM4

COM3