MSI G52-72221X3 Manual page 15

Serial Port Connector: COM2 (Optional)
The mainboard offers one 9-pin male DIN connector COM 1 (on the
rear panel), and one optional serial port JCOM1. Both are 16550A
high speed communication ports that send/receive 16 bytes FIFOs.
You can attach a serial mouse or other serial device directly to them.
PIN SIGNAL
1 DCD
3 SOUT
5 GND
7 RTS
9 RI
Debug Card Connector: JSPI1(Optional)
The connector is for internal debugging only.
Clear CMOS Jumper: JCLR1
There is a CMOS RAM on board that has a power supply from
external battery to keep the data of system configuration.
With the CMOS RAM, the system can automatically boot OS
every time it is turned on. If you want to clear the system
configuration, use the JCLR1 (Clear CMOS Jumper) to clear data. Follow the instructions below
to clear the data:
MSI Reminds You...
You can clear CMOS by shorting 2-3 pin while the system is off. Then return to 1-2 pin position.
Avoid clearing the CMOS while the system is on; it will damage the mainboard.
AGP (Accelerated Graphics Port) Slot
The AGP slot allows you to insert the AGP
graphics card.
specification designed for the throughput demands of 3D graphics. It introduces a 66MHz, 32-bit
channel for the graphics controller to directly access main memory. The slot supports AGP card
for 8x/4x at 1.5v (3.3v is not supported).
PCI (Peripheral Component Interconnect) Slots
The PCI slots allow you to insert the expansion cards to
meet your needs. When adding or removing expansion
cards, make sure that you unplug the power supply first.
Meanwhile, read the documentation for the expansion card to make any necessary hardware or
software settings for the expansion card, such as jumpers, switches or BIOS configuration.
DESCRIPTION
Data Carry Detect
Receive Data Transmit
Data
Request To Send Ring
Indicate
AGP is an interface
PIN SIGNAL
2 SIN
4 DTR
6 DSR
8 CTS
10 X
GND
SPI_CLK_F
SI
VCC3_SB
1
2
3
9
RTS SOUT
GND
[9]RI
DSR
DTR
CTS
DESCRIPTION
Serial in or receive data
Serial out or transmit data
Data Set Ready
Clear To Send
X
SPI_HOLD#
GND
SPI_CSO_F#
SPI_MISO
VCC3_SB
1
2
3
Keep Data Clear Data
SIN[2]
1
2
3