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The mainboard has two 9-pin male DIN connectors for serial ports COM A
and COM B. These two ports are 16550A high speed communication ports
that send/receive 16 bytes FIFOs. You can attach a mouse or a modem cable
directly into these connectors.
PIN DEFINITION
PIN
1
2
3
4
5
6
7
8
9
1 2 3 4 5
6 7 8 9
COM A
SIGNAL
DCD(Data Carry Detect)
SIN(Serial In or Receive Data)
SOUT(Serial Out or Transmit Data)
DTR(Data Terminal Ready)
GND
DSR(Data Set Ready)
RTS(Request To Send)
CTS(Clear To Send)
RI(Ring Indicate)
2-30
COM B
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