MSI 845 Ultra C Manual

							Chapter 2
2-4
CPU Core Speed Derivation Procedure
  IfCPU Clock =100MHz
Core/Bus ratio = 14
  then
CPU core speed =Host Clock x Core/Bus ratio
= 100MHz x 14
= 1.4GHz
Overclocking
This motherboard is designed to support overclocking.
However, please make sure your components are able to
tolerate such abnormal setting, while doing overclocking.
Any attempt to operate beyond product specifications is not
recommended. We do not guarantee the damages or risks
caused by inadequate operation or beyond product
specifications.
WARNING!
5.Connect the fan power cable from the mounted fan to the 3-pin fan power
connector on the board.
fan power cable 
						

							Hardware Setup
2-5
The mainboard provides 2 slots for 184-pin, 2.5V unbuffered DDR DIMM
with 4 memory banks. You can install PC1600/PC2100 DDR SDRAM modules
on the DDR DIMM slots (DDR 1~2). To operate properly, at least one DIMM
module must be installed.
Memory
Introduction to DDR SDRAM
DDR (Double Data Rate) SDRAM is similar to conventional SDRAM, but
doubles the rate by transferring data twice per cycle. It uses 2.5 volts as op-
posed to 3.3 volts used in SDR SDRAM, and requires 184-pin DIMM modules
rather than 168-pin DIMM modules used by SDR SDRAM.  High memory band-
width makes DDR an ideal solution for high performance PC, workstations and
servers.
DDR DIMM Slots
     (DDR 1~2) 
						

							Chapter 2
2-6
DDR Module Combination
You can install either single-sided or double-sided 184-pin DDR DIMM
modules into DDR DIMM slots to meet your needs.  Different from the SDR
DIMM, the DDR DIMM has only one notch on the center of module.  The
number of pins on either side of the breaks are different.  The module will only
fit in the right orientation.
You can install memory modules in any combination as follows:
Installing DDR Modules
1.The DDR DIMM has only one notch on the center of module.  The module
will only fit in the right orientation.
2.Insert the DIMM memory module vertically into the DIMM slot. Then
push it in.
 3.The plastic clip at each side of the DIMM slot will automatically close.
Voltnotch
SlotMomory Module Total Memory
Slot 1 64MB, 128MB, 256MB,64MB~1GB
(Bank 0 & 1) 512MB, 1GB
Slot 2 64MB, 128MB, 256MB,64MB~1GB
(Bank 2 & 3) 512MB, 1GB
Maximum System Memory Supported 64MB~2GB 
						

							Hardware Setup
2-7
Power Supply
ATX 20-Pin Power Connector: JW1
This connector allows you to connect to an ATX power supply. To con-
nect to the ATX power supply, make sure the plugs of the power supply is
inserted in the proper orientation and the pins are aligned. Then push down the
power supply firmly into the connector. The power connector supports instant
power on function which means that system will boot up immediately when the
power supply connector is inserted on the board.The mainboard supports ATX power supply for the power system. Be-
fore inserting the power supply connector, always make sure that all compo-
nents are installed properly to ensure that no damage will be caused.
ATX 12V Power Connector: JPW1
This 12V power connector is used to provide power to the CPU.
PIN SIGNAL
1 GND
2 GND
3 12V
4 12V
 JPW1 Pin DefinitionPIN SIGNAL
11 3.3V
12 -12V
13 GND
14 PS_ON
15 GND
16 GND
17 GND
18 -5V
19 5V
20 5VPIN SIGNAL
1 3.3V
2 3.3V
3 GND
45V
5 GND
65V
7 GND
8 PW_OK
9 5V_SB
10 12V
 JW1 Pin Definition
2 4
JPW1
1 3           JW1
101
2011 
						

							Chapter 2
2-8
The Back Panel provides the following connectors:
Back Panel
Mouse Connector: JKBMS1
The mainboard provides a standard PS/2® mouse mini DIN connector for
attaching a PS/2® mouse. You can plug a PS/2® mouse directly into this
connector. The connector location and pin assignments are as follows:
Mouse
Keyboard USBParallel
COM ACOM B
L-out L-in MICMidi/Joystick
PIN SIGNALDESCRIPTION
1 Mouse DATA Mouse DATA
2 N C No connection
3 GND Ground
4 VCC +5V
5 Mouse Clock Mouse clock
6 N C No connection
 Pin Definition
PS/2 Mouse (6-pin Female)
213
45 6 
						

							Hardware Setup
2-9
Keyboard Connector: JKBMS1
The mainboard provides a standard PS/2® keyboard mini DIN connector
for attaching a PS/2® keyboard.  You can plug a PS/2® keyboard directly into
this connector.
USB Connectors
The mainboard provides a UHCI (Universal Host Controller Interface)
Universal Serial Bus root for attaching USB devices such as keyboard, mouse
or other USB-compatible devices.  You can plug the USB device directly into
ths connector.
USB Ports
1   2   3   4
5   6   7   8
PIN SIGNALDESCRIPTION
1 Keyboard  DATA Keyboard  DATA
2 N C No connection
3 GND Ground
4 VCC +5V
5 Keyboard Clock Keyboard clock
6 N C No connection
 Pin Definition
PIN SIGNALDESCRIPTION
1 VCC +5V
2 -Data 0 Negative Data Channel 0
3 +Data0 Positive Data Channel 0
4 GND Ground
5 VCC +5V
6 -Data 1 Negative Data Channel 1
7 +Data 1 Positive Data Channel 1
8 GND Ground
USB Port Description
PS/2 Keyboard (6-pin Female)
213
45 6 
						

							Chapter 2
2-10
Serial Port Connector: COM A & COM B
The mainboard offers two 9-pin male DIN connectors as serial ports
COM A and COM B. 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 them.
     9-Pin Male DIN Connectors
Joystick/Midi Connectors
You can connect a joystick or game pad to this connector.
Audio Port Connectors
Line Out is a connector for Speakers or Headphones.  Line In is used for
external CD player, Tape player, or other audio devices.  Mic is a connector for
microphones.
1/8” Stereo Audio Connectors
1   2   3   4   5
6  7  8  9
Line Out Line In MIC
PIN SIGNALDESCRIPTION
1 D C D Data Carry Detect
2 SIN Serial In or Receive Data
3 SOUT Serial Out or Transmit Data
4 D T R Data Terminal Ready)
5 GND Ground
6 DSR Data Set Ready
7 RTS Request To Send
8 CTS Clear To Send
9 RI Ring Indicate
Pin Definition 
						

							Hardware Setup
2-11
Parallel Port Connector: LPT1
The mainboard provides a 25-pin female centronic connector for LPT.  A
parallel port is a standard printer port that supports Enhanced Parallel Port
(EPP) and Extended Capabilities Parallel Port (ECP) mode.
13 1
14
25
PIN SIGNALDESCRIPTION
1 STROBEStrobe
2 DATA0 Data0
3 DATA1 Data1
4 DATA2 Data2
5 DATA3 Data3
6 DATA4 Data4
7 DATA5 Data5
8 DATA6 Data6
9 DATA7 Data7
10 ACK# Acknowledge
11 BUSYBusy
12 PE Paper End
13 SELECT Select
14 AUTO FEED#Automatic Feed
15 ERR#Error
16 INIT# Initialize Printer
17 SLIN# Select In
18 GND Ground
19 GND Ground
20 GND Ground
21 GND Ground
22 GND Ground
23 GND Ground
24 GND Ground
25 GND Ground
Pin Definition 
						

							Chapter 2
2-12
The mainboard provides connectors to connect to FDD, IDE HDD,   case,
modem, LAN, USB Ports, IR module and CPU/System FAN.
Floppy Disk Drive Connector: FDD1
The mainboard provides a standard floppy disk drive connector that
supports 360K, 720K, 1.2M, 1.44M and 2.88M floppy disk types.
Connectors
IrDA Infrared Module Header: JIR1
This connector allows you to connect to IrDA Infrared modules. You
must configure the setting through the BIOS setup to use the IR function. The
JIR1 is compliant to Intel Front Panel I/O Connectivity Design Guide.
1NC
2NC
3 VCC5
4 GND
5 IRTX
6 IRRX
Pin    Signal JIR1 Pin Definition
1
2 5
6
JIR1
FDD1 
						

							Hardware Setup
2-13
Hard Disk Connectors: IDE1 & IDE2
The mainboard has a 32-bit Enhanced PCI IDE and Ultra DMA 33/66/100
controller that provides PIO mode 0~4, Bus Master, and Ultra DMA/33/66/100
function. You can connect up to four hard disk drives, CD-ROM, 120MB Floppy
(reserved for future BIOS) and other devices. These connectors support the
provided IDE hard disk cable.
IDE1 (Primary IDE Connector)
The first hard drive should always be connected to IDE1. IDE1 can
connect a Master and a Slave drive. You must configure second hard
drive to Slave mode by setting the jumper accordingly.
IDE2 (Secondary IDE Connector)
IDE2 can also connect a Master and a Slave drive.
TIP:
If you install two hard disks on cable, you must configure the
second drive to Slave mode by setting its jumper. Refer to the
hard disk documentation supplied by hard disk vendors for jumper
setting instructions.
IDE 1
IDE 2