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Chapter 2
Serial Port Connector: COM A & COM B
The mainboard offers two 9-pin male DIN connectors for serial
port COM A and COM B. The ports are 16550A high speed communica-
tion ports that send/receive 16 bytes FIFOs. You can attach a serial mouse
or other serial devices directly to them.
1 2 3 4 5
6 7 8 9
9-Pin Male DIN Connectors
Midi/Joystick/Audio Port Connector
The mainboard provides a 15-pin female connector for connect-
ing a game joysticks/pads or MIDI devices.
The three ports at bottom provide the mainboard audio functions:
Line Out is a connector for headphone or speakers. Line In is used for
external CD player, tape players or other audio devices to be recorded by
your computer or played through the Line Out. Mic is a connector for
the microphone.
PIN
SIGNAL
1
DCD
2
SIN
3
SOUT
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
RI
Pin Definition
Midi / Joystick
L-out
L-in
2-12
DESCRIPTION
Data Carry Detect
Serial In or Receive Data
Serial Out or Transmit Data
Data Terminal Ready
Ground
Data Set Ready
Request To Send
Clear To Send
Ring Inticate
MIC
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