MSI 845 Ultra C Manual

							Chapter 3
3-10OptionDescription
SetupThe password prompt appears only when end users try to
run Setup.
AlwaysA password prompt appears every time when the com-
puter is powered on or when end users try to run Setup. Swap   Floppy
Setting to Enabled will swap floppy drives A: and B:.
Seek  Floppy
This setting causes the BIOS to search for floppy disk drives at boot time.
When enabled, the BIOS will activate the floppy disk drives during the boot
process: the drive activity light will come on and the head will move back and
forth once. First A: will be done and then B: if it exists. Setting options: Disabled,
Enabled.
Password  Check
This specifies the type of AMIBIOS password protection that is implemented.
Setting options are described below.
Boot OS/2 for DRAM > 64MB
This allows you to run the OS/2®
 operating system with DRAM larger than
64MB. When you choose No, you cannot run  the OS/2®
 operating system
with DRAM larger than 64MB. But it is possible if you choose Yes.
APIC  Function
This field is used to enable or disable the APIC (Advanced Programmable
Interrupt Controller). Due to compliance with PC2001 design guide, the system
is able to run in APIC mode. Enabling APIC mode will expand available IRQ
resources for the system. Settings: Enabled and Disabled.
MPS Table Version
This field allows you to select which MPS (Multi-Processor Specification)
version to be used for the operating system. You need to select the MPS
version supported by your operating system. To find out which version to use,
consult the vendor of your operating system. Settings: 1.4 and 1.1. 
						

							AMI BIOS Setup
3-11 L1 Cache
Cache memory is additional memory that is much faster than conventional
DRAM (system memory). When the CPU requests data, the system transfers
the requested data from the main DRAM into cache memory, for even faster
access by the CPU. The setting enables/disables the internal cache (also known
as L1 or level 1 cache). Setting to Enabled will speed up the system performance.
Flash Protection
This function protects the BIOS from accidental corruption by unauthorized
users or computer viruses. When enabled, the BIOS data cannot be changed
when attempting to update the BIOS with a Flash utility. To successfully up-
date the BIOS, youll need to disable this Flash Protection function. Setting
options: Disabled, Enabled.
System BIOS Cacheable
Selecting Enabled allows caching of the system BIOS ROM at F0000h-FFFFFh,
resulting in better system performance. However, if any program writes to this
memory area, a system error may result. Setting options: Enabled, Disabled. 
						

							Chapter 3
3-12 Advanced Chipset FeaturesConfigure DRAM Timing by
This setting determines whether DRAM timing is controlled by the SPD (Serial
Presence Detect) EEPROM on the DRAM module. Setting to SPD enables
CAS# Latency, RAS# Precharge, RAS# to CAS# Delay, and Precharge Delayautomatically to be determined by BIOS based on the configurations on the
SPD. Selecting Manual allows users to configure these fields manually.
CAS# Latency
The field controls the CAS latency, which determines the timing delay before
SDRAM starts a read command after receiving it. Setting options: 2.5 Clocks,
2 Clocks. 2 Clocks increases system performance while 2.5 Clocks provides
more stable system performance.
RAS# Precharge
This setting controls the number of cycles for Row Address Strobe (RAS) to
be allowed to precharge. If insufficient time is allowed for the RAS to accumu-
late its charge before DRAM refresh, refresh may be incomplete and DRAM
may fail to retain data. This item applies only when synchronous DRAM is Note: Change these settings only if you are familiar with the chipset. 
						

							AMI BIOS Setup
3-13 installed in the system. Setting options: 2 Clocks, 3 Clocks.
RAS# to CAS# Delay
When DRAM is refreshed, both rows and columns are addressed separately.
This setup item allows you to determine the timing of the transition from RAS
(row address strobe) to CAS (column address strobe). The less the clock cycles,
the faster the DRAM performance. Setting options: 3 Clocks, 2 Clocks.
Precharge Delay
This setting controls the precharge delay, which determines the timing delay
for DRAM precharge. Setting options: 5 Clocks, 6 Clocks, 7 Clocks.
DRAM Integrity Mode
Select ECC (Error-Checking & Correcting Code) or Non-ECC according to the
type of DRAM installed.
AGP Aperture Size
The field selects the size of the Accelerated Graphics Port (AGP) aperture.
Aperture is a portion of the PCI memory address range dedicated for graphics
memory address space. Host cycles that hit the aperture range are forwarded
to the AGP without any translation. Settings: 4MB, 8MB, 16MB, 32MB, 64MB,
128MB, 256MB.
Delayed Transaction
The chipset has an embedded 32-bit posted write buffer to support delayed
transactions cycles. Select Enabled to support compliance with PCI specifica-
tion version 2.1. Settings: Enabled and Disabled. 
						

							Chapter 3
3-14 Power Management SetupIPCA  Function
This item is to activate the ACPI (Advanced Configuration and Power Man-
agement Interface) function. If your operating system is ACPI-aware, such as
Windows 98SE/2000/ME, select Yes. Available options: Yes and No.
ACPI  Standby  State
This item specifies the power saving modes for ACPI function. Options are:
S1/POSThe S1 sleep mode is a low power state.  In this state, no
system context is lost (CPU or chipset) and hardware
maintains all system context.
S3/STRThe S3 sleep mode is a lower power state where the infor-
mation of system cofiguration and open applications/
files is saved to main memory that remains powered while
most other hardware components turn off to save energy.
The information stored in memory will be used to restore
the system when an “wake up” event occurs.
USB Wakeup From S3
This item allows the activity of the USB device to wake up the system from S3 
						

							AMI BIOS Setup
3-15 (Suspend to RAM) sleep state. Settings: Enabled and Disabled.
Mouse Wakeup From S3
This item allows the activity of the mouse to wake up the system from S3
(Suspend to RAM) sleep state. Settings: Enabled and Disabled.
Keyboard Wakeup From S3
This item allows the activity of the keyboard to wake up the system from S3
(Suspend to RAM) sleep state. Settings: Enabled and Disabled.
Specific Key for Wakeup
This setting allows users to set a specific key for the Keyboard Wakeup
From S3 function.
Power  Management/APM
Setting to Enabled will activate an Advanced Power Management (APM)
device to enhance Max Saving mode and stop CPU internal clock. Settings are
Disabled and Enabled.
Suspend Time Out (Minute)
After the selected period of system inactivity, all devices except the CPU shut
off. Settings are Disabled, 1, 2, 4, 8, 10, 20, 30, 40, 50, and 60.
FDC/LPT/COM Ports, Primary/Secondary Master/Slave IDE
These items specify if the BIOS will monitor the activity of the specified hard-
ware peripheral or component. If set to Monitor, any activity detected on the
specified hardware peripheral or component will wake up the system or pre-
vent the system from entering the power saving modes. Settings: Monitor and
Ignore.
Power Button Function
This feature sets the function of the power button. Settings are:
On/OffThe power button functions as normal on/off button.
SuspendWhen you press the power button, the computer enters
the suspend/sleep mode, but if the button is pressed for
more than four seconds, the computer is turned off. 
						

							Chapter 3
3-16 Note: If you change these settings, you must reboot the system until it
enters the operating system and then power off the system. By doing
so, the changed settings will come into effect next time when you
power on the system.Wake Up On Ring
When setting to Enabled, the feature allows your system to be awakened from
the power saving modes through an incoming call from the modem. Settings:
Enabled and Disabled.
Wake Up On PME
When setting to Enabled, the feature allows your system to be awakened from
the power saving modes through any event on PME (Power Management
Event). Settings: Enabled and Disabled.
Resume By RTC Alarm
This is used to enable or disable the feature of booting up the system on a
scheduled time/date from the soft off (S5) state. Settings: Enabled and Disabled.
RTC  Alarm Date/Hour/Minute/Second
If Resume By RTC Alarm is set to Enabled, the system will automatically
resume (boot up) on a specific date/hour/minute/second specified in these
fields. Available settings for each item are:
Alarm Date01 ~ 31, Every Day
Alarm Hour00 ~ 23
Alarm Minute00 ~ 59
Alarm Second00 ~ 59
Power Again
This setting specifies whether your system will reboot after a power failure or
interrupts occurs. Available settings are:
Power OffLeaves the computer in the power off state.
Power OnReboots the computer.
Last StateRestores the system to the status before power failure or
interrupt occurs. Note: You need to install a modem supporting power on function for
Wake Up On Ring function. 
						

							AMI BIOS Setup
3-17 PNP/PCI ConfigurationsThis section describes configuring the PCI bus system and PnP (Plug & Play)
feature.  PCI, or Personal Computer Interconnect, is a system which allows I/O
devices to operate at speeds nearing the speed the CPU itself uses when
communicating with its special components.  This section covers some very
technical items and it is strongly recommended that only experienced users
should make any changes to the default settings.
Clear ESCD
The ESCD (Extended System Configuration Data) NVRAM (Non-volatile Ran-
dom Access Memory) is where the BIOS stores resource information for both
PNP and non-PNP devices in a bit string format. When the item is set to Yes, the
system will reset ESCD NVRAM right after the system is booted up and then
set the setting of the item back to No automatically.
PCI VGA Palette Snoop
When set to Enabled, multiple VGA devices operating on different buses can
handle data from the CPU on each set of palette registers on every video
device. Bit 5 of the command register in the PCI device configuration space is
the VGA Palette Snoop bit (0 is disabled). For example, if there are two VGA
devices in the computer (one PCI and one ISA) and the: 
						

							Chapter 3
3-18 The setting must be set to Enabled if any ISA bus adapter in the system
requires VGA palette snooping.
PCI Slot1/6 IRQ, PCI Slot2/5 IRQ, PCI Slot3 IRQ, PCI Slot4 IRQ
This item specifies the IRQ line for each PCI slot. Settings: 3, 4, 5, 7, 9, 10, 11
and Auto. Selecting Auto allows BIOS to automatically determine the IRQ line
for each PCI slot.
DMA Channel 0/1/3/5/6/7
These items specify the bus that the system DMA (Direct Memory Access)
channel is used.
The settings determine if AMIBIOS should remove a DMA from the available
DMAs passed to devices that are configurable by the system BIOS. The
available DMA pool is determined by reading the ESCD NVRAM. If more
DMAs must be removed from the pool, the end user can reserve the DMA by
assigning an ISA/EISA setting to it.
IRQ 3/4/5/7/9/10/11
These items specify the bus where the specified IRQ line is used.
The settings determine if AMIBIOS should remove an IRQ from the pool of
available IRQs passed to devices that are configurable by the system BIOS.
The available IRQ pool is determined by reading the ESCD NVRAM. If more
IRQs must be removed from the IRQ pool, the end user can use these settings
to reserve the IRQ by assigning an ISA/EISA setting to it. Onboard I/O is
configured by AMIBIOS. All IRQs used by onboard I/O are configured as
PCI/PnP. If all IRQs are set to ISA/EISA, and IRQ 14/15 are allocated to the
onboard PCI IDE, IRQ 9 will still be available for PCI and PnP devices.  Avail-
able settings: ISA/EISA and PCI/PnP.  VGA Palette Snoop
 Bit SettingAction
DisabledData read or written by the CPU is only directed to the
PCI VGA device’s palette registers.
EnabledData read or written by the CPU is directed to both the
PCI VGA device’s palette registers and the ISA VGA
device’s palette registers, permitting the palette registers
of both VGA devices to be identical. 
						

							AMI BIOS Setup
3-19 Integrated PeripheralsUSB  Controller
This setting is used to enable/disable the onboard USB controllers. Settings:
All USB Port, Disabled, USB Port 0&1, USB Port 2&3.
USB  Legacy  Support
Set to All Device if your need to use any USB device in the operating system
that does not support or have any USB driver installed, such as DOS and SCO
Unix. Set to No Mice only if your want to use any USB device other than the
USB mouse. Setting options: Disabled, No Mice, All Device.
On-Chip  IDE
This setting controls the on-chip IDE controller. Setting options: Disabled,
Primary, Secondary, Both.
AC’97 Audio
Auto allows the mainboard to detect whether an audio device is used. If the
device is detected, the onboard AC’97 (Audio Codec’97) controller will be
enabled; if not, it is disabled. Disable the controller if you want to use other
controller cards to connect an audio device. Settings: Auto, Disabled.
AC’97  Modem
Auto allows the mainboard to detect whether a modem is used. If a modem is