9
Serial Port Connector: JCOM1 (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 DESCRIPTION PIN SIGNAL DESCRIPTION
1
3
5
7
9
DCD
SOUT
GND
RTS
RI
Data Carry Detect
Receive Data Transmit
Data
Request To Send Ring
Indicate
2
4
6
8
10
SIN
DTR
DSR
CTS
X
Serial in or receive data
Serial out or transmit data
Data Set Ready
Clear To Send
X
Clear CMOS Jumper: JBAT1
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
JBAT1 (Clear CMOS Jumper) to clear data. Follow the instructions
in the image 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, which will damage the mainboard.
AGP (Accelerated Graphics Port) Slot
The AGP slot allows you to insert the AGP graphics
card. AGP is an interface 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.
PCI Interrupt Request Routing
The IRQ, abbreviation of interrupt request line and pronounced I-R-Q, are hardware lines over
which devices can send interrupt signals to the microprocessor. The PCI IRQ pins are typically
connected to the PCI bus INT A# ~ INT D# pins as follows:
Order1 Order2 Order3 Order4
PCI Slot 1 INT B# INT C# INT D# INT A#
PCI Slot 2 INT C# INT D# INT A# INT B#
PCI Slot 3 INT D# INT A# INT B# INT C#
PCI Slot 4 INT B# INT C# INT D# INT A#
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