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...

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...

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...

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...

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...

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...

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...

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...

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...

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....