Acer S3811 manual Power-On Self-Test Post

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Power-On Self-Test (POST)

Each time you turn on the system, the Power-on Self Test (POST) is initiated. Several items are tested during POST, but is for the most part transparent to the user.

The Power-On Self Test (POST) is a BIOS procedure that boots the system, initializes and diagnoses the system components, and controls the operation of the power-on password option. If POST discovers errors in system operations at power-on, it displays error messages on screen, generates a check point

code at port 80h or even halts the system if the error is fatal.

The main components on the main board that must be diagnosed and/or initialized by POST to ensure system functionality are as follows:

Microprocessor with built-in numeric co-processor and cache memory subsystem

Direct Memory Access (DMA) controller

Interrupt system

Three programmable timers

ROM subsystem

RAM subsystem

CMOS RAM subsystem and real time clock/calendar with battery backup

Onboard parallel interface controller

Embedded hard disk interface and one diskette drive interface

Keyboard and auxiliary device controllers

I/O ports

One parallel port

One PS/2-compatible mouse port

One PS/2-compatible keyboard port

NOTE: When Post executes a task, it uses a series of preset numbers called check points to be latched at port 80h, indicating the stages it is currently running. This latch can be read and shown on a debug board.

The following table describes the BIOS common tasks carried out by POST. Each task is denoted by an unique check point number. For other unique check point numbers that are not listed in the table, refer to the corresponding product service guide.

Post Checkpoints List: The list may vary accordingly depending on your BIOS

Checkpoint

Description

03

Disable NMI, Parity,video for EGA, and DMA controllers. Initialize BIOS, POST,

 

Runtime data area. Also initialize BIOS modules on POST entry and GPNV area.

 

Initialized CMOS as mentioned in the Kernel Variable "wCMOSFlags."

04

Check CMOS diagnostic byte to determine if battery power is OK and CMOS

 

checksum is OK. Verify CMOS checksum manually by reading storage area.

 

If the CMOS checksum is bad, update CMOS with power-on default values and

 

clear passwords. Initialize status register A.

05

Initializes the interrupt controlling hardware (generally PIC) and interrupt vector

 

table.

 

 

06

Do R/W test to CH-2 count reg. Initialize CH-0 as system timer. Install the

 

POSTINT1Ch handler. Enable IRQ-0 in PIC for system timer interrupt. Traps

 

INT1Ch vector to "POSTINT1ChHandlerBlock."

07

Fixes CPU POST interface calling pointer.

 

 

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Contents Imedia S3811 Service Guide Date Chapter Updated Revision HistoryCopyright Conventions Preface Page Introducing the Motherboard IntroductionFeatures Dimensions and weight Bios FirmwareIntegrated I/O Mainboard Components Label ComponentBlock Diagram Imedia S3811 Icon Component DescriptionRear view Color/Use Headphone Audio Jack Function Table1CH Port Introduction Component DescriptionKeyboard PS/2 or USB, manufacturing option System PeripheralsMouse PS/2 or USB, manufacturing option SpeakersCard Reader Option Specification Hardware Specifications and ConfigurationsBios Hotkey List Main Board Major ChipsVideo Interface System MemoryCache Memory Audio InterfaceUSB Port Power ManagementIDE Interface Devices Idle Shut DownGlobal Standby Mode Power Management Function Acpi support functionDevice Standby Mode Suspend ModeStandard Configuration Using BiosAbout the Setup Utility Entering the Setup UtilitySetup Utility Menus Updating the Bios Product Information Item HelpStandard Cmos Features Date and TimeSata Port0 Auto A.R.T. EnabledUAHCI Port1 /Port2 Halt On All, But KeyboardQuick Boot Enabled Advanced Bios FeaturesQuiet Boot Enabled Sequence from Available devices Removable Device Priority Press Enter Boot Up NumLock On USB Beep Message DisabledAdvanced Chipset Features Integrated Peripherals Power Management Setup Restore On AC Power Loss Last State Smart Fan Enabled PC Health StatusSpread Spectrum Enabled Frequency/Voltage ControlSupervisor Password Not Installed Bios Security FeaturesLoad Default Settings User Password Not InstalledSave & Exit Setup Exit Without SavingMachine Disassembly and Replacement General Information Before You BeginOpening the chassis Standard Assembly ProcessRemoving PSU bracket Removing HDD bracket Removing front bezelInsert the ODD devices Setting the Motherboard Page 3x1G 1x1G2x1G 4x1GAssembly motherboard Insert the system FanPage Front Pulling in HDD &ODD Sata cable on Motherboard Insert VGA card Insert the PSU Long for HDD used Short for ODD used Overview Standard Disassembly Process Removing the power-supplyPage Pulling out the Sata ODD cable and Sata HDD cable Removing the HDDFrontBack Removing the VGA Card Pulling out the Audio/USB1/CR/PANEL cableRemoving system Fan Removing the Main Board Page Release the four latch show bellow then remove the Memory Removing the ODD Removing the ODD bracketRemoving the ODD bracket Pushing the Cable Removing power switch & HDD-LED holder Page Machine Disassembly and Replacement Power-On Self-Test Post KB-5 Initializes DMAC-1 & DMAC-2 Needed Post Error Messages List Bios Messages Action/FRUSpecifics about the type and location of the memory error Main board and Memory Error Symptoms ListError Symptom Action/FRU Processor / Processor Fan Hard Disk DriveError Symptom Action/FRU CD/DVD-ROM Drive AudioParallel/Serial Ports Error Symptom Action/FRU Video and MonitorPower Supply KeyboardError Symptom Action/FRU Other ProblemsUndetermined Problems Installing the Motherboard in a Case Jumper and Connector InformationSafety Precautions Choosing a Computer CaseChecking Jumper Settings Setting JumpersJumper Settings Checking Jumper SettingsJumper Type Description Setting Default IIIustration Connecting Case Components Connecting 24-pin power cableATX12V ATX 12V Power Connector Pin Signal Name Sysfan Cooling Fan Power Connector Pin Signal Name FunctionAtxpoweratx 24-pin Power Connector Pin Signal Name Pin Signal NameReset Switch Pin Signal Name FunctionPower/Sleep/Message waiting LED Power SwitchInstalling the Processor Installing HardwareBefore installing the Processor CPU Installation Procedure Following illustration shows CPU installation componentsInstallation Procedure Installing Memory ModulesMemory Memory Bus Installing Serial ATA Hard Drives Sata cable optional Sata power cable optionalInstalling Add-on Cards PCIE1X1 SlotOnboard PCI interface does not support 64-bit Scsi cards Connecting Optional Devices FAUDIO1 Front Panel Audio headerSata 1~4 Serial ATA connectors Spdifo Spdif out headerOptionFRU Field Replaceable Unit List Exploded Diagram ChassisP5-15L w/ card reader ME BOMPage ChassisP5-15L w/o card reader ME BOM Page FRU List