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CHAPTER 2
2.14 Serial Port Connectors: COM A & COM B
The mainboard has two serial ports COMA and COMB. These two ports are
16550A high speed communication ports that send/receive 16 bytes FIFOs.
You can attach a mouse or a modem directly into these connectors.
Pin #
1
2
3
4
5
6
7
8
9
1 2 3 4 5
6 7 8 9
COM A
Serial Ports (9-pin Male)
PIN DEFINITION
Definition
DCD(Data Carry Detect)
SIN(Serial In or Receive Data)
SOUT(Serial Out or Transmit Data)
DTR(Data Terminal Ready)
G N D
DSR(Data Set Ready)
RTS(Request To Send)
CTS(Clear To Send)
RI(Ring Indicate)
2-26
HARDWARE INSTALLATION
COM B
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