Table of Contents
Advertisement
Chapter 2
Serial Port Connectors: COMA & COMB (for SiS645DX) /
JCOM3 (for SiS650GX/651)
The mainboard offers two 9-pin connectors as serial port COMA & COMB
/ JCOM3. The ports are 16550A high speed communication ports that send/
receive 16 bytes FIFOs. You can attach a serial mouse or other serial devices
directly to the connectors.
1 2 3 4 5
6 7 8 9
9-Pin Male DIN Connectors
5 4 3 2 1
JCOM3
9 8 7 6
VGA DB 15 Pin Connector (for SiS650GX/651 only)
One optional DB 15-pin VGA connector is provided for connection to a
VGA monitor.
5
15
DB 15-Pin Female Connector
1
11
Pin Definition
PIN
SIGNAL
1
DCD
2
SIN
3
SOUT
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
RI
Pin Definition
Analog Video Display Connector (DB-15S)
PIN
SIGNAL DESCRIPTION
1
Red
2
Green
3
Blue
4
Not used
5
Ground
6
Ground
7
Ground
8
Ground
9
Power
10
Ground
1 1
Not used
12
SDA
13
Horizontal Sync
14
Vertical Sync
15
SCL
2-10
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 Indicate
Advertisement
Table of Contents
