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Acer AcerAltos 21000, Системное руководство

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System  Boards

3-11

The retention mechanism cover only fits one way.  Both shafts of
the retention mechanism and the retention mechanism cover
have a O and a OO sign.  Match the O on the cover with the O on
the retention mechanism first, then hooked them together and
then insert the OO side to the retention mechanism and make
sure they are clipped.

Removing an Intel Pentium II Xeon processor

Follow these steps to remove a Pentium II Xeon processor:

1.  Remove the thermal and fan connector and then unclip the

retention mechanism cover.

Содержание AcerAltos 21000

Страница 1: ... FHU OWRV System Guide ...

Страница 2: ... any warranties merchantability or fitness for any particular purpose Any software described in this manual is sold or licensed as is Should the programs prove defective following their purchase the buyer and not this company its distributor or its dealer assumes the entire cost of all necessary servicing repair and any incidental or consequential damages resulting from any defect in the software ...

Страница 3: ... openings should never be blocked by placing the product on a bed sofa rug or other similar surface This product should never be placed near or over a radiator or heat register or in a built in installation unless proper ventilation is provided 7 This product should be operated from the type of power indicated on the marking label If you are not sure of the type of power available consult your dea...

Страница 4: ...oduct from the wall outlet and refer servicing to qualified service personnel under the following conditions a When the power cord or plug is damaged or frayed b If liquid has been spilled into the product c If the product has been exposed to rain or water d If the product does not operate normally when the operating instructions are followed Adjust only those controls that are covered by the oper...

Страница 5: ...rom children and dispose of used battery promptly 16 Use only the proper type of power supply cord set provided in your keyboard manual accessories box for this unit It should be a detachable type UL listed CSA certified type SJT rated 6A 125V minimum VDE approved or its equivalent Maximum length is 15 feet 4 6 meters ...

Страница 6: ...his equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures 1 Reorient or relocate the receiving antenna 2 Increase the separation between the equipment and receiver 3 Connect the equipment into an outlet on a circuit diff...

Страница 7: ...s the assembly and disassembly of the system housing It also shows you how to install the main board power supply fan module storage devices and other housing components Chapter 3 System Boards This chapter describes the main board the memory board the SCSI backplane board and the LCD display module Also It introduces the system s unique features and powerful architecture It includes a brief intro...

Страница 8: ... following are the conventions used in this manual Text entered by user Represents text input by the user Option Items Represents options that you can select on the screen etc Represent the actual keys that you have to press on the keyboard NOTE Gives bits and pieces of additional information related to the current topic CAUTION Gives precautionary measures to avoid possible hardware or software p...

Страница 9: ...1 3 System Startup 1 7 1 4 Power on Problems 1 8 Chapter 2 System Housing 2 1 External and Internal Structure 2 2 2 1 1 Front Panel 2 2 2 1 2 Rear Panel 2 4 2 1 3 LCD Display Module 2 6 2 1 4 Internal Components 2 12 2 2 Opening the Housing Panels 2 14 2 2 1 Removing the Left and Right Panels 2 14 2 2 2 Opening the Front Panel Door 2 15 2 3 Installing and Removing Storage Devices 2 17 2 3 1 Instal...

Страница 10: ...ermal Air Guide 2 35 2 9 Cable Connections 2 37 Chapter 3 System Boards 3 1 Main Board 3 1 3 1 1 Layout 3 3 3 1 2 Jumpers and Connectors 3 4 3 1 3 Installing and Removing an Intel Pentium II Xeon CPU 3 7 3 1 4 Installing and Removing the Termination Board 3 10 3 1 5 Installing and Removing a VRM Voltage Regulator Module 3 12 3 2 Memory Board 3 14 3 2 1 Layout 3 14 3 2 2 Memory Configurations 3 14 ...

Страница 11: ...ency 4 5 4 2 4 L1 Cache 4 5 4 2 5 L2 Cache 4 5 4 2 6 Floppy Drive A 4 5 4 2 7 Floppy Drive B 4 5 4 2 8 IDE Primary Channel Master 4 5 4 2 9 IDE Primary Channel Slave 4 5 4 2 10 Total Memory 4 6 4 2 11 Serial Port 1 4 6 4 2 12 Serial Port 2 4 6 4 2 13 Parallel Port 4 6 4 2 14 Pointing Device 4 6 4 2 15 Memory Parity Mode 4 6 4 2 16 Onboard USB 4 7 4 3 Product Information 4 8 4 3 1 Product Name 4 8 ...

Страница 12: ...de 4 18 4 6 2 Silent Boot 4 19 4 6 3 Num Lock After Boot 4 19 4 6 4 Memory Test 4 19 4 6 5 Initialize SCSI Before IDE 4 19 4 6 6 System Boot Drive 4 20 4 6 7 Boot From IDE CD ROM 4 20 4 6 8 Single Processor MP Table 4 20 4 6 9 MP Table Compliant 4 21 4 6 10 CPU Clock Ratio 4 21 4 7 Advanced Configuration 4 22 4 7 1 Onboard Devices Configuration 4 23 4 7 2 PnP PCI System Configuration 4 29 4 7 3 Me...

Страница 13: ...ord 4 47 4 9 Date and Time 4 48 4 9 1 Date 4 49 4 9 2 Time 4 49 4 10 Remote Diagnostic Configuration 4 50 4 11 Load Setup Default Settings 4 51 4 12 Abort Settings Change 4 52 Chapter 5 Diagnostics and Utilities 5 1 Advanced Server Manager 5 1 5 2 Remote Diagnostic Manager 5 3 Appendix A LCD Module Event Log List ...

Страница 14: ...binary compatibility with all previous Intel Architecture processors Also the Pentium II Xeon processor is available in 512K 1MB and 2MB L2 cache options with the introduction of the Slot 2 socket Unlike Slot 1 Pentium IIs which access the L2 at half the processor speed the Slot 2 accesses the L2 at full processor clock speed An addition to the Pentium II Xeon processor is the Intel 450NX chipset ...

Страница 15: ...C I O APIC BIOS BIOS ISA Slot 1 3 6 7 KBC KBC CD ROM BMIDE HDD USB VGA VGA LAN LAN 64bit 100MHz GTL 16 bit 200MHz 133MB s 133MB s The system includes a main and memory subsystems with four Slot 2 processors and voltage regulators for the processors The memory subsystem runs in 100 MHz timing and has a maximum size of up to 4GB Six PCI and 1 PCI ISA shared slots are also incorporated for fast expan...

Страница 16: ...att power supply modules The power subsystem supports a redundant configuration such that even if one power supply fails the remaining two continue to work together to supply 860 watt power to a fully configured system You can also replace a faulty power supply module without opening the system housing or shutting down the system See section 2 5 for more information Hot swappable Redundant Housing...

Страница 17: ...xviii AcerAltos 21000 System Guide The system BIOS protects the CMOS data and other system software with a power on password keyboard password setup control disk drive control and monitor control ...

Страница 18: ... a Site Before unpacking and installing the system select a suitable site for the system for maximum efficiency The system is suitable to set up in an office environment Consider the following factors when choosing a site for the system Near a grounded power outlet Clean and dust free Sturdy surface free from vibration Well ventilated and away from sources of heat Secluded from electromagnetic fie...

Страница 19: ...ollowing items from the package AcerAltos 21000 System AcerAltos 21000 System Guide CD ROM Driver Kits System keys hung inside the front panel door If any of the above items are7 damaged or missing contact your dealer immediately Save the boxes and packing materials for future use ...

Страница 20: ... size It comes with four wheels that facilitate short distance transits The two front wheels each include a lever to lock the wheels after you have positioned the system into place 2 After moving lock the wheels by pressing down the levers Make sure to unlock the wheels when you want to move the system again 3 Connect the system power cable into the power supply modules on the rear panel See secti...

Страница 21: ... Basic Connections The system unit keyboard mouse and monitor constitute the basic system Before connecting any other peripherals connect these peripherals first to test if the basic system is running properly 1 2 1 Connecting a Keyboard ...

Страница 22: ...Getting Started 1 5 1 2 2 Connecting a Mouse ...

Страница 23: ...1 6 AcerAltos 21000 System Guide 1 2 3 Connecting a VGA Monitor ...

Страница 24: ...pear on the LCD display screen The POST messages indicate if the system is running well or not See Appendix A for a list of LCD messages If the system does not turn on or boot after pressing the power switch go to the next section for the possible causes of the boot failure Aside from the self test messages you can determine if the system is in good condition by checking if the following occurred ...

Страница 25: ...r panel Make sure that each cable is properly connected to each power supply No power comes from the grounded power outlet Have an electrician check your power outlet Loose or improperly connected internal power cables Refer to section 2 5 1 for the cable connections and check the internal cable connections If you are not confident to perform this step ask a qualified technician to help you Make s...

Страница 26: ...uty steel chassis in a twin tower design The spacious housing boasts high expansion capability and flexible configuration It can be converted to fit into a rack mount cabinet by using the Rack Mount Kit For more information about the rack mount kit please refer to your dealer ...

Страница 27: ...l consists of the diskette CD ROM tape drive bays power switch LED indicators and LCD display screen The right part contains the hot swappable SCSI hard disk drive bays with 8 drive trays for SCSI drives One pair of system keys are hung inside the front panel door Additional duplicate keys can be found at the back of the system 3 4 1 7 6 2 5 8 9 10 11 12 13 ...

Страница 28: ...e housing 6 SCSI HDD Bays Eight empty SCSI HDD bays allow installation of hot swap SCSI drives 7 Power Switch The power switch turns the system on 8 System Power LED Lights up green when the power is on This also denotes that the system is running on a good supply of AC power 9 System HDD Access LED Lights up green when at least one of the hard disks is currently accessing 10 RDM Active LED Lights...

Страница 29: ...e keyboard mouse VGA monitor printer and serial devices the slot openings for expansion boards and the power supply Item Description 1 PS 2 keyboard port Connects to PS 2 keyboards 2 Video port Connects to CRT monitors 3 PS 2 mouse port Connects to the PS 2 mouse 11 17 18 10 12 13 14 15 16 3 4 5 9 1 2 6 8 7 19 ...

Страница 30: ...emovable and installable even when the system is operating See section 2 5 12 Power supply power LED Lights up green when the power supply is on 13 Power supply fan fail LED Lights up Yellow when one of the power supply fans is faulty 14 Power cable connector Connects to the power cable 15 Fan module fail LED Lights up Yellow when one or two fans are faulty 16 Fan module includes two fans The fan ...

Страница 31: ...oint errors encountered upon system initialization Normally the system BIOS and the micro controller firmware send the LCD display messages that appear on the screen However if you hooked up a special purpose driver to control the LCD module this driver defines the messages See the driver manual for more information For a lists of LCD messages from the system BIOS please refer to Appendix A Main M...

Страница 32: ... 35 DEG C CPU3 35 DEG C CPU4 35 DEG C Enter Back This item displays the CPU temperature reading It will only display the number of available CPUs inside the system Whenever the CPU temperature exceeds the required threshold an error message will be displayed and logged into the Event Log for later viewing Voltage CPU1 2 00 V CPU2 2 02 V CPU3 2 02 V CPU4 1 98 V CPU12L2 2 50 V CPU34L2 2 54 V Enter N...

Страница 33: ...ed and logged into the Event Log for later viewing Fan HFAN1 OK HFAN2 OK HFAN3 OK HFAN4 OK HFAN5 OK HFAN6 OK Enter Back This item displays the hot swap redundant fan condition It will only display the number of available hot swap redundant fan installed in the system If any of the fans stop working an error message will be displayed and logged into the Event Log for later viewing Power Power Fan S...

Страница 34: ...KB Mouse OK USB1 OK USB2 OK SCSI1 OK SCSI2 OK Enter Back This item displays the fuse condition for the keyboard mouse USB devices and SCSI devices If any of the fuses break down an error message will be displayed and logged into the Event Log for later viewing Event Log Submenu Event 6 12 31 10 29 1998 PS 2 Keyboard Interface Error Down Up Back The Event Log monitors and records any event that occ...

Страница 35: ...view other events Choose Back to go back to the main menu Reset System Submenu RESET SYSTEM Yes No This submenu resets the system operation Press the Select button left button to choose and then press the Enter button right button to confirm Help Submenu Navigation System Tips System Info Main Menu Provides useful information regarding the operation of the LCD display screen Press the Select butto...

Страница 36: ...play screen is placed differently For more information about the rack mount installation and configuration please refer to its user s guide To replace the LCD display screen 1 Turn off the power to the system unit and unplug all cables 2 Carefully pull out the LCD display screen There is a connector at the back of the LCD display 3 Disconnect the LCD connector 4 Connect the LCD connector at the ba...

Страница 37: ...ports and the slot openings for installation of ISA and PCI expansion boards The front panel display occupies the upper front section of the left panel The section below the front panel display accommodates one 3 5 inch and three 5 25 inch drives These devices on the front section are externally accessible Here is a diagram of the system components on the left panel of the system housing Expansion...

Страница 38: ...hould be installed whenever a power supply is removed to provide the system with regular cooling See section 2 5 for details on the power subsystem The lower section allows installation of a SCSI backplane board and a set of eight hot swappable SCSI drive trays Here is a diagram of the components that reside on the right panel Power Supply Module Bays SCSI Drive Tray Bays SCSI Backplane Board Powe...

Страница 39: ... NOT attempt the procedures in the following sections unless you are confident of your capability to perform them Otherwise ask a service technician for assistance 2 2 1 Removing the Left and Right Panels A microswitch is allocated on the left side of the housing panel It helps indicate whether the panel is removed or intact To remove the left or right panel 1 Turn off the power to the system unit...

Страница 40: ...g the Front Panel Door A security lock secures the front door to protect against unauthorized access To open the front door 1 Insert the key to the lock and turn it clockwise until it points to the unlocked icon Right Panel Left Panel ...

Страница 41: ...moving the Front Panel Door The doors are attached to the main housing by screwless hinges Follow these steps to remove the door 1 Unlock the door with the key when necessary 2 Open it to more than a 45 angle 3 Lift it up a little then move it away from the housing ...

Страница 42: ...rive or another hard disk drive Your basic system comes with a CD ROM drive and a 3 5 inch diskette drive already installed 2 3 1 Installing and Removing a 3 5 inch Storage Device The housing comes with a drive guide for installing 3 5 inch storage devices To install a 3 5 inch storage device 1 Open the front panel door and remove the left panel See section 2 2 for more information on opening the ...

Страница 43: ...2 18 AcerAltos 21000 System Guide 3 Secure the drive with four screws 4 Insert the drive into the bay ...

Страница 44: ...anel To remove a 3 5 inch storage device 1 Open the front panel door and remove the left panel See section 2 2 for more information on opening the housing panels 2 Disconnect the power and signal cables 3 Detached the external device by removing the screw located on the side and then gently pulling out the device 4 Remove the four screws and detach the 3 5 inch drive from the drive guide ...

Страница 45: ... The housing comes with a drive guide for installing 5 25 inch internal storage devices To install a 5 25 inch storage device 1 Open the front panel door and remove the left panel See section 2 2 for more information on opening the housing panels 2 Remove two screws to detach the metal cover ...

Страница 46: ...System Housing 2 21 3 Attach the drive guides on the sides of the external device as shown below 4 Insert the drive into the bay ...

Страница 47: ...he left panel To remove a 5 25 inch storage device 1 Open the front panel door and remove the left panel See section 2 2 for more information on opening the housing panels 2 Disconnect the power and signal cables 3 Detached the external device by removing the screws and gently pulling out the device 4 Remove four screws to detach the drive from the drive guide ...

Страница 48: ...ator jumper before connecting the SCSI drive to the system For the location of the jumper connectors and the terminator jumper please refer to your hard drive s instructions or manual The system supports up to eight hot swappable drive trays Follow these steps to install a hot swap SCSI drive 1 Open the front panel door 2 Use your finger to release the drive tray as shown below and then pull it ou...

Страница 49: ...00 System Guide 3 Secure the hard disk drive with four screws 4 Install the tray into the drive bay pushing it gently until it reaches the connector on the backplane board 5 Push the lever back until it clicks into place ...

Страница 50: ...ils The remaining two power supply modules still satisfy up to 860 watt of system power requirement If fans fail to operate the power supply module will shut down The LED indicators of the power supply module will be turned off If the fans are functioning properly and the power supply fails the fans will keep operating The power subsystem provides a standby current and a remote on off feature to s...

Страница 51: ...2 26 AcerAltos 21000 System Guide To Install a power supply module 1 Insert the power supply into the housing Make sure that the power supply is properly inserted ...

Страница 52: ...ing 2 27 2 Secure the power supply with the screw knobs on both sides 3 Connect a power cable to the power Plug it into an electrical socket You will see a green light when the power supply is functioning properly ...

Страница 53: ...supply module 1 Detach the power cable from the electrical outlet and also from the power supply The power indicator light turns off 2 Unscrew the screw knobs and carefully pull out the power supply until it detaches from the housing Make sure the power supply subsystem is supplying a minimum of 860W 2 power supply modules to the system ...

Страница 54: ...tributed inside the housing to cool down the system They are hot swappable and redundant You can simply take one out and put a new one in if a fan fails to operate You don t even have to shut down the system To change a rear hot swap housing fan 1 Turn the screw knob counterclockwise to open the housing fan cage ...

Страница 55: ...ltos 21000 System Guide 2 Push down the clip and pull out the housing fan 3 Slide in a new housing fan The power indicator lights up 4 Close the housing fan cage and turn the screw knob clockwise to lock it Clip ...

Страница 56: ... change a front hot swap housing fan 1 Remove the left panel See section 2 2 for more information on opening the housing panels 2 Push down the clip and pull out the housing fan 3 Insert a new one 4 Close the left panel Clip ...

Страница 57: ...ard 1 Remove the left panel of the housing See section 2 2 for more information on opening the housing panels 2 Remove the bracket cover opposite an empty PCI slot Save the screw for later use 2 Align the board with the slot 3 Insert the board into the slot until it completely fits in 4 Secure the board with a screw ...

Страница 58: ...System Housing 2 33 5 Follow the same steps when installing an ISA board Just make sure that you remove the bracket cover opposite an ISA slot ...

Страница 59: ...the housing To avoid electric shock and damage to the system DO NOT perform the following procedure while the system is ON 2 8 1 Removing the Thermal Air Guide Follow these steps to remove the thermal air guide 1 Unplug all power cables from the wall socket 2 Open the left panel door Refer to section 2 2 for instructions on opening the door 3 Remove the two screws that secure the air guide to the ...

Страница 60: ...2 8 2 Reinstalling the Thermal Air Guide Follow these steps to replace the thermal air guide back into the housing 1 Position the air guide in its place as shown below 2 Make sure that the air guide fits properly in place ...

Страница 61: ...2 36 AcerAltos 21000 System Guide 3 Secure the air guide with two screws 4 Reattached the left panel door ...

Страница 62: ...cable can only fit one way and is not interchangeable For a list of all the cables and their respective connectors please refer to the power cable list in this section The figure below illustrates the power cables that connect to the system board and the SCSI backplane board CN System board connectors C Cable number P Cable point head and tail Power Backplane Board SCSI Backplane Board System Boar...

Страница 63: ...ber P Cable point head and tail 1 System Board and SCSI Backplane Board Power Connection Cable System Board SCSI Backplane Board Power Backplane Board C1 CN8 C1 P2 J1 C1 P1 C2 CN15 C2 P2 J2 C2 P1 C3 CN22 C3 P2 J3 C3 P1 C4 CN9 C4 P5 J4 C4 P6 2 I 2 C Status Connector Cable System Board SCSI Backplane Board C5 CN50 CN10 3 LCD Display Module Cable Connection Cable System Board LCD Display Module C6 CN...

Страница 64: ...ive IDE Devices and SCSI Device Connectors Cable System Board Devices C11 CN39 Floppy Disk Drive C12 CN42 IDE Devices C13 CN41 50 pin SCSI Devices 6 LVD SCSI Channel A and B Connector Cable System Board SCSI Backplane Board C14 CN48 CN12 ...

Страница 65: ...12K and 1MB L2 write back cache Intel Pentium II Xeon running at 450 with integrated 512K 1MB and 2MB L2 write back cache One VRM Voltage Regulator Module for each CPU and one VRM for the L2 cache of two CPUs 256 KB Flash ROM for system BIOS Supports two PCI buses through one PXB PCI Expander Bridge System clock calendar with battery backup One 68 pin Wide SCSI connector for each SCSI channel One ...

Страница 66: ...PCI ISA shared One dual channel PCI Ultra Wide and LVD Ultra2 SCSI controller I2O ready One 10 100 Ethernet LAN chip on board with Wake up on LAN WOL function External ports PS 2 keyboard and mouse ports Two buffered high speed serial ports One SPP ECP EPP high speed parallel port Two USB ports VGA port Front panel LCD LED interface ...

Страница 67: ...er 18 Wide SCSI interface channel B 19 Wide SCSI interface channel A 20 Narrow SCSI interface 21 IDE connector 22 FDD connector 23 Buzzer 24 PIIX4e PCI to ISA Bridge chipset 25 Memory board slot 26 Memory and I O Controller MIOC 27 RDM connector 28 Front panel bard connector 29 Power supply status control connector 30 Power connector 3 31 Power connector 2 32 Power connector 1 33 Slot 2 sockets 1 ...

Страница 68: ...3 4 AcerAltos 21000 System Guide 3 1 2 Jumpers and Connectors The figure below shows the jumper and connector locations on the system board The blackened pin of a jumper or connector represents pin 1 ...

Страница 69: ...lection Disable on board VGA Connector List Connector Function CN1 HDD LED connector CN3 Reserved CN4 Voltage Regulator Module VRM 1 connector CN5 Fan connector 4 CN7 Fan connector reserved CN8 Power cable connector CN10 Slot 2 CPU 1 thermal connector CN11 Voltage Regulator Module VRM 2 connector CN12 PS 2 Keyboard below PS 2 Mouse above port CN13 Power LED connector CN14 Slot 2 CPU 2 thermal conn...

Страница 70: ...nnector CN29 Voltage Regulator Module VRM 6 connector CN31 32 RDM Remote Diagnostic management connector CN33 Fan connector reserved CN34 RDM LED connector CN35 HDD activity indication from Add on card CN36 Housing Intrusion Switch connector left panel CN37 Fan connector 2 CN38 Reserved CN39 FDD connector CN40 Power button connector CN41 Narrow SCSI connector CN42 IDE connector These connectors CN...

Страница 71: ...P21 Reserved JP22 Reserved JP23 Reserved Right door intrusion connector 3 1 3 Installing and Removing an Intel Pentium II Xeon CPU Intel s Pentium II Xeon CPU is a Slot 2 processor that uses a 330 contact connector which is a bit longer that a Slot 1 processor Other than the size the major improvement of the Slot 2 processor is at the L2 cache Pentium II Xeon processors access the L2 cache at full...

Страница 72: ...ecure the CPU Installing an Intel Pentium II Xeon processor Follow these steps to install a Pentium II Xeon processor 1 Attach the fansink module to the Pentium II Xeon processor and secure it with four screws 2 Remove the left panel of the housing See section 2 2 for more information on opening the housing panels 3 If there is an existing termination board installed in the CPU slot remove it Refe...

Страница 73: ...ion mechanism cover to secure the processor as shown below The retention mechanism cover only fits one way Both shafts of the retention mechanism and the retention mechanism cover have a O and a OO sign Match the O on the cover with the O on the retention mechanism first then hooked them together and then insert the OO side to the retention mechanism and make sure they are clipped OO ...

Страница 74: ... 3 1 4 Installing and Removing the Termination Board When you are not using all the Slot 2 sockets you must install a termination board into each empty slot Installing a Termination Board Follow these steps to install the termination board 1 Position the termination board over the empty slot 2 Carefully insert the golden fingers of the termination board into the slot until the board fits completel...

Страница 75: ...atch the O on the cover with the O on the retention mechanism first then hooked them together and then insert the OO side to the retention mechanism and make sure they are clipped Removing an Intel Pentium II Xeon processor Follow these steps to remove a Pentium II Xeon processor 1 Remove the thermal and fan connector and then unclip the retention mechanism cover ...

Страница 76: ...es one for the processor and another one for the L2 cache However two L2 caches share one VRM If you are installing two Pentium II Xeon processor you need three VRMs two VRMs for each processor and one VRM for both of the L2 cache to share Refer to section 3 1 2 for the location of the VRM sockets The following table shows the VRM socket allocation VRM Socket Slot 2 Socket VRM Socket 1 CN4 CPU 1 V...

Страница 77: ...sor or the L2 cache If you see a red light after power on then it means that the VRM is bad and that it needs to be replaced To install a VRM 1 Find an empty VRM socket and flip the lever back 2 Carefully insert a VRM into the socket This process will automatically lock the VRM in place To remove a VRM 1 Push down both the locking mechanisms 2 Take out the VRM ...

Страница 78: ...el 450NX chipset Each of the sockets represents one independent bank which allows you to install DIMMs with different capacities to form a configuration 3 2 1 Layout 3 2 2 Memory Configurations Every four slots of memory slot 1 4 5 8 9 12 and 13 16 forms a 4 way interleaving group You must configure four identical EDO ECC buffered DIMMs in a group for your system to work properly Please contact yo...

Страница 79: ...M 4 128M 4 1536M 128M 1 128M 1 128M 2 128M 4 128M 4 128M 4 2048M 256M 1 256M 1 256M 2 1024M 256M 1 256M 1 256M 2 256M 4 2048M 256M 1 256M 1 256M 2 256M 4 64M 4 2304M 256M 1 256M 1 256M 2 256M 4 64M 4 64M 4 2560M 256M 1 256M 1 256M 2 256M 4 128M 4 2560M 256M 1 256M 1 256M 2 256M 4 128M 4 128M 4 3072M 256M 1 256M 1 256M 2 256M 4 256M 4 3072M 256M 1 256M 1 256M 2 256M 4 256M 4 256M 4 4096M 3 2 3 Remo...

Страница 80: ...oard slot on the system board Install the memory board with the component side up 2 Insert the board into the slot until it fits into place 3 Insert one end of the metal bracket into the hole located at the back of the housing 4 Align the clamp rail with the board edge 5 Secure the metal bracket with a screw as shown below ...

Страница 81: ...s slotted to ensure proper installation If you slip in a DIMM but does not completely fit you may have inserted it the wrong way Reverse the orientation of the DIMM Removing a DIMM To remove a DIMM press the holding clips on both sides of the socket outward to release the DIMM Place your forefingers on the top of the DIMM before you press the holding clips to gently disengage the DIMM from the soc...

Страница 82: ...llowing major features Hot swap feature that allows replacement of a defective hard drive even while the system is in full operation This feature requires a RAID controller board and RAID drivers 2 channel configurations which support 4 SCSI hard drives per channel configuration Indicates hard disk drive failure through a front panel board LED Supports ultra 2 SCSI SCA Single Connector Attachment ...

Страница 83: ...CN1 CN4 Channel A SCSI Drive Slot 1 to CN12 SCSI Channel A CN13 SCSI Channel B CN9 Power Connector SCSI Slot ID Switches CN10 I2C connector CN14 Connects to LED Boards CN11 Combined LED connector CN5 CN8 Channel B SCSI Drive Slot 5 to ...

Страница 84: ...tch Settings The backplane board comes with eight ID switches that allow you to define up to 16 hard disk IDs The illustration below shows the switch settings with the corresponding hard disk IDs Hard Disk ID ID Switch Setting ID Switch Setting Hard Disk ID ...

Страница 85: ...orts the devices in slots 1 to 4 and channel B supports the devices in slots 5 to 8 SCSI channel A for Slot 1 to 4 SCSI channel B for Slot 5 to 8 CN12 SCSI Channel A connector CN13 SCSI Channel B connector CN48 SCSI Channel A connector CN47 SCSI Channel B connector System Board SCSI Backplane Board ...

Страница 86: ...s a front panel module that serves as an interface to the internal system components and relays external messages through the LCD display screen Refer to section 2 1 3 for more information The figure below shows the LCD display module connections with the system board CN16 CN1 ...

Страница 87: ...to run Setup when starting the computer unless you get a Run Setup message The Setup program loads configuration values into the battery backed nonvolatile memory called CMOS RAM This memory area is not part of the system RAM If you repeatedly receive Run Setup messages the battery may be bad In this case the system cannot retain configuration values in CMOS Ask a qualified technician for assistan...

Страница 88: ...Utility main menu then appears BIOS Utility System Information Product Information Disk Drives Power Management Startup Configuration Advanced Configuration System Security Date and Time Remote Diagnostic Configuration Load Default Settings Abort Settings Change Move highlight bar Select Esc Exit The parameters on the screens show default values These values may not be the same as those in your sy...

Страница 89: ... Floppy Drive B None IDE Primary Channel Master None IDE Primary Channel Slave None Total Memory xxx MB 1st Bank None 2nd Bank None 3rd Bank None 4th Bank EDO PgDn PgUp Move Screen Esc Back to Main Menu The System Information menu shows the current basic configuration of your system The command line at the bottom of the menu tells you how to move from one screen to another and return to the main m...

Страница 90: ...eters in the System Information screens show default settings These settings are non configurable from these screens Select other configuration options from the BIOS Utility main menu to change the settings 4 2 1 Processor The Processor parameter specifies the type of processor currently installed in your system The system is designed to support the Intel Pentium II Xeon CPU 4 2 2 Processor Speed ...

Страница 91: ...ry size currently supported by the system and whether it is enabled or disabled 4 2 6 Floppy Drive A This parameter specifies the type of drive designated as Floppy Drive A 4 2 7 Floppy Drive B This parameter specifies the system s current Floppy Drive B settings 4 2 8 IDE Primary Channel Master This parameter specifies the current configuration of the IDE device connected to the master port of th...

Страница 92: ...m 4 2 11 Serial Port 1 This parameter indicates the serial port 1 address and IRQ setting 4 2 12 Serial Port 2 This parameter indicates the serial port 2 address and IRQ setting 4 2 13 Parallel Port This parameter indicates the parallel port address and IRQ setting 4 2 14 Pointing Device The BIOS utility automatically detects if there is a mouse connected to the system If there is this parameter d...

Страница 93: ...BIOS Utility 4 7 4 2 16 Onboard USB This parameter specifies whether the onboard USB controller is enabled or not ...

Страница 94: ...asking for technical support The following screen shows the Product Information items Product Information Page 1 1 Product Name xxxxxxxxx System S N xxxxxxxxx Main Board ID xxxxxxxxx Main Board S N xxxxxxxxx System BIOS Version vx xx System BIOS ID xxx xx xxx xx BIOS Release Date xx xx xx Esc Back to Main Menu 4 3 1 Product Name This parameter specifies the official name of the system 4 3 2 System...

Страница 95: ...is parameter specifies the system board s serial number 4 3 5 System BIOS Version This parameter specifies the version of the BIOS utility 4 3 6 System BIOS ID This parameter specifies the identification number of the BIOS utility 4 3 7 BIOS Release Date This parameter specifies the official date the BIOS version was released ...

Страница 96: ...g this menu The following screen shows the Disk Drives parameters and their default settings Disk Drives Page 1 1 Floppy Drive A xx MB xx inch Floppy Drive B xx MB xx inch IDE Primary Channel Master IDE Primary Channel Slave Move Highlight Bar Change Setting F1 Help The triangle mark that precede an item within a menu indicates that there is a detailed menu for that particular item Select the item...

Страница 97: ...l Master item displays the following menu IDE Primary Channel Master Page 1 1 Type Auto Cylinder Head Sector Size MB Hard Disk Block Mode Auto Advanced PIO Mode Auto Hard Disk Size 504MB Auto Hard Disk 32 Bit Access Enabled CD ROM Drive DMA Mode Disabled Move Highlight Bar Change Setting F1 Help The parameters for the IDE Primary Channel Slave menu are the same as in the above screen ...

Страница 98: ... drive B Choose None if you do not have a second floppy drive 4 4 2 IDE Drives There are two IDE drive option items under the Disk Drives menu Select the IDE Primary Channel Master item if you want to configure an IDE device set as master Select the IDE Primary Channel Slave item if you want to configure an IDE device set as slave To configure an IDE device designated as master 1 Select the IDE Pr...

Страница 99: ...ace in case you have to reconfigure the disk in the future If you have installed an IDE hard disk that was previously formatted but does not use the disk native parameters or structure i e the disk may be formatted according to the user specified number of cylinders heads and sectors select the User option Then enter the appropriate drive information If there is no device connected choose None To ...

Страница 100: ...e installed hard disk supports the function If supported it allows for faster data recovery and read write timing that reduces hard disk activity time This results in better hard disk performance To disregard the feature change the setting to Disabled Hard Disk Size 504 MB When set to Auto the BIOS utility automatically detects if the installed hard disk supports the function If supported it allow...

Страница 101: ...Novell NetWare If your software or hard disk does not support this function set this parameter to Disabled CD ROM Drive DMA Mode This parameter allows you to enable or disable the CD ROM drive DMA mode Set this parameter to Enabled to enable the DMA mode for the CD ROM drive This improves the system performance since it allows direct memory access to the CD ROM To deactivate the function set the p...

Страница 102: ...ng F1 Help 4 5 1 Power Management Mode This parameter allows you to reduce power consumption When this parameter is set to Enabled you can configure the IDE hard disk and system timers Setting to Disabled deactivates the power management feature and all the timers IDE Hard Disk Standby Timer This parameter allows the hard disk to enter standby mode after inactivity of 1 to 15 minutes depending on ...

Страница 103: ...PU Clock in Sleep State If you want to stop the CPU clock when the system enters the sleep or suspend mode set this parameter to Yes If not then select No 4 5 2 ACPI BIOS ACPI Advanced Configuration and Power Interface enables the operating system to monitor and control the amount of power supplied to each device attached to the system When enabled ACPI uses the OS Operating System to turn off the...

Страница 104: ...guration Page 1 1 Fast POST Mode Auto Silent Boot Enabled Num Lock After Boot Enabled Memory Test Disabled Initialize SCSI Before IDE Disabled System Boot Drive Drive A Then C Boot from IDE CD ROM Disabled Single Processor MP Table Enabled MP Table Compliant v1 4 CPU Clock Ratio 4 Move Highlight Bar Change Setting F1 Help 4 6 1 Fast POST Mode This parameter allows the system to boot faster by skip...

Страница 105: ... to Disabled BIOS is in the conventional text mode where you see the system initialization details on the screen 4 6 3 Num Lock After Boot This parameter allows you to activate the Num Lock function upon booting The default setting is Enabled 4 6 4 Memory Test When set to Enabled this parameter allows the system to perform a RAM test during the POST routine When set to Disabled the system detects ...

Страница 106: ...le CD in the IDE CD ROM drive If a CD is present the system boots from the CD ROM otherwise it boots from the drive specified in the System Boot Drive parameter When set to Disabled the system boots from the drive specified in the System Boot Drive parameter Note that the CD ROM drive mentioned above refers to an IDE CD ROM drive When setting the boot options for a SCSI CD ROM drive see section 4 ...

Страница 107: ...is parameter shows the multiprocessor specification compliance version The default setting is V1 4 If you install an older operating system particularly SCO UNIX v3 2 x x or earlier set this parameter to V1 1 4 6 10 CPU Clock Ratio Sets this parameter for the Core BUS ratio of your system The clock speed of the BUS does not necessarily equal the CPU s core The bus clock speed is often slower than ...

Страница 108: ...tings in the Advanced Configuration if you are not a qualified technician to avoid damaging the system The following screen shows the Advanced Configuration parameters Advanced Configuration Onboard Devices Configuration PnP PCI System Configuration Memory Cache Configuration Non PnP ISA Device Configuration System Event Configuration Move Highlight Bar Change Setting F1 Help ...

Страница 109: ...d Configuration menu displays the following screen Onboard Devices Configuration Page 1 2 Serial Port 1 Disabled Base Address 3F8h IRQ 4 Serial Port 2 Enabled Base Address 2F8h IRQ 3 Parallel Port Enabled Base Address 3Bch IRQ 5 Operation Mode Standard ECP DMA Channel Move Highlight Bar Change Setting F1 Help PgDn PgUp Move Screen The following screen shows page 2 of the Onboard Devices Configurat...

Страница 110: ...hip Enabled SMBUS Interrupt IRQ9 Enabled Move Highlight Bar Change Setting F1 Help PgDn PgUp Move Screen Serial Port 1 This parameter allows you to enable or disable the serial port 1 The Base Address and IRQ items are configurable only if this parameter is enabled Base Address This function lets you set a logical base address for serial port 1 The options are 3F8h 2F8h 3E8h 2E8h IRQ This function...

Страница 111: ...Base Address This function lets you set a logical base address for serial port 2 The options are 3F8h 2F8h 3E8h 2E8h IRQ This function lets you assign an interrupt for serial port 2 The options are IRQ 3 and 4 If you assign 3F8h to serial port 1 you may only assign 2F8h or 2E8h to serial port 2 If you assign 2F8h to serial port 1 you may only assign 3F8h or 3E8h to serial port 2 ...

Страница 112: ...nction lets you assign an interrupt for the parallel port The options are IRQ 5 and 7 The Base Address and IRQ parameters are configurable only if Parallel Port is enabled If you install an add on card that has a parallel port whose address conflicts with the parallel port on board the system automatically disables the onboard functions Check the parallel port address on the add on card and change...

Страница 113: ... to operate in bidirectional mode and at a speed higher than the maximum data transfer rate ECP DMA Channel This item becomes active only if you select Extended Capabilities Port ECP as the operation mode It allows you to assign DMA channel 1 or DMA channel 3 for the ECP parallel port function as required in Windows 95 Onboard Floppy Disk Controller This parameter lets you enable or disable the on...

Страница 114: ...is parameter lets you enable or disable the SCSI controller on board When enabled it activates the SCSI function of the system When disabled it deactivates the function Boot from Onboard SCSI Device When set to Enabled the system checks for a bootable SCSI device If a SCSI device is present the system boots from that device otherwise it boots from the drive specified in the System Boot Drive param...

Страница 115: ...lities Enabling this feature will reserve IRQ9 for SMBUS use 4 7 2 PnP PCI System Configuration The PnP PCI System Configuration allows you to specify the settings for your PCI devices Selecting this option displays the following screens PnP PCI System Configuration Page 1 2 PCI IRQ Setting Auto INTA INTB INTC INTD PCI Slot 1 PCI Slot 2 PCI Slot 3 PCI Slot 4 PCI Slot 5 PCI Slot 6 PCI Slot 7 Onboar...

Страница 116: ...lly assigns IRQs to PnP devices If your PCI device is not PnP you can manually assign the interrupt for each device Refer to your PCI card manual for more information When the PCI IRQ Setting is set to Auto all the IRQ setting fields become gray and non configurable PCI Slots These parameters allow you to specify the appropriate interrupt for each of the PCI devices You can assign IRQ3 IRQ4 IRQ5 I...

Страница 117: ...interrupt for the onboard SCSI when the PCI IRQ Setting parameter is set to Manual This parameter is grayed and not user configurable when the PCI IRQ Setting is set to Auto PCI IRQ Sharing Setting this parameter to Yes allows you to assign the same IRQ to two different devices To disable the feature select No If there are no IRQs available to assign for the remaining device function we recommend ...

Страница 118: ...A card manual before setting this parameter Reset Resource Assignments Set this parameter to Yes to avoid IRQ conflict when installing non PnP or PnP ISA cards This clears all resource assignments and allows BIOS to reassign resources to all installed PnP devices the next time the system boots After clearing the resource data the parameter resets to No 4 7 3 Memory Cache Configuration The Memory C...

Страница 119: ...o BIOS from RAM The default is Enabled Memory at 15MB 16MB Reserved for To prevent memory address conflicts between the system and expansion boards reserve this memory range for the use of either the system or an expansion board Memory Parity Mode This parameter allows you to select the DRAM operating mode Setting to ECC turns on the error check and correct ECC function ECC automatically corrects ...

Страница 120: ...ve Highlight Bar Change Setting F1 Help PgUp PgDn Move Screen The items marked No are currently not in use while those marked Yes are in use by PnP devices Non PnP ISA Device Configuration Page 2 4 DMA DMA 00 No DMA 04 DMA 01 No DMA 05 No DMA 02 DMA 06 DMA 03 No DMA 07 No Expansion ROM Region C8000h CBFFFh No CC000h CFFFFh No D0000h D3FFFh No D4000h D7FFFh No D8000h DBFFFh No DC000h DFFFFh No Move...

Страница 121: ... No 1C0h 1CFh No 2A0h 2AFh No 1D0h 1DFh No 2B0h 2BFh No Move Highlight Bar Change Setting F1 Help PgUp PgDn Move Screen Non PnP ISA Device Configuration Page 2 4 I O Region 2C0h 2CFh No 3A0h 3AFh No 2D0h 2DFh No 3B0h 3BFh No 2E0h 2EFh No 3C0h 3CFh No 2F0h 2FFh No 3D0h 3DFh No 300h 30Fh No 3E0h 3EFh No 310h 31Fh No 3F0h 3FFh No 320h 32Fh No 330h 33Fh No 340h 34Fh No 350h 35Fh No 360h 36Fh No 370h 3...

Страница 122: ... allow you to reserve 16 byte memory address ranges for non PnP devices When the system configures PnP devices the address ranges that you marked will not be used anymore You can assign memory addresses to non PnP devices at random as long as you cover the address range required by the device For example for a card that requires 178h 188h address you have to set regions 170h 17Fh and 180h 18Fh to ...

Страница 123: ... Enabled ECC Enabled PCI Enabled I O Check Enabled Move Highlight Bar Change Setting F1 Help System Event Logging Allows you to record monitored events that occur during the operation of your system Event Log BIOS Version This parameter specifies the version of the Event Log BIOS Total Event Log Number The number of events currently located in the event log area Remain of Event Log Area The percen...

Страница 124: ...viewing View Event Logs Page 1 1 No Type Time Status 1 System Limit Exceeded 12 20 Oct 02 1998 Viewed 3rd CPU Fan Bad 2 System Limit Exceeded 13 54 Sep 29 1998 Viewed 3rd CPU Fan Bad 3 Log Area Reset Cleared 13 54 Sep 29 1998 Viewed ESC Back to Main Menu Events Control This parameter monitors the following events and logs them into the event log file if there is a change in status Temperature Volt...

Страница 125: ...MHz This parameter monitors the activity of this bus when set to enabled The default is Enabled I O Check Monitors the ISA for uncorrectable errors This parameter monitors the activity of this bus when set to enabled The default is Enabled System Event Configuration Page 2 2 Critical Event Process Stop POST After CPU or Memory Reduction Disabled Halt System If No CPU or Memory Available Enabled Th...

Страница 126: ...he system will continue running Threshold Setting CPU Warning Temperature You can set a threshold for the CPU s temperature level here and every time the CPU s temperature exceeds this level a warning will be logged into the event log file A typical warning degree threshold setting is 55 C CPU Fatal Temperature When the CPU s temperature reaches this threshold level a fatal warning will be logged ...

Страница 127: ...e reading exceeds the safety operating range it will be logged into the event log file LCD Temperature When the LCD s temperature reaches this threshold level a warning will be logged into the event log file A typical warning degree threshold setting is 55 C ...

Страница 128: ... menu System Security Page 1 1 Disk Drive Control Floppy Drive Normal Hard Disk Drive Normal Setup Password None Power On Password None Operation Mode Normal Move Highlight Bar Change Setting F1 Help 4 8 1 Disk Drive Control The disk drive control features allow you to control the floppy drive or the hard disk drive boot function to prevent loading operating systems or other programs from a certai...

Страница 129: ...Protect All Sectors Disables the write function on all sectors Write Protect Boot Sector Disables the write function only on the boot sector Disabled Disables all hard disk functions 4 8 2 Setup Password The Setup Password prevents unauthorized access to the BIOS utility Setting a Password 1 Make sure that JP5 is set to 2 3 bypass password You cannot enter the BIOS utility if a Setup password does...

Страница 130: ...st entry 6 Retype the password then press After setting the password the system automatically sets the Setup Password parameter to Present 7 Press to exit the System Security screen and return to the main menu 8 Press to exit the BIOS utility A dialog box appears asking if you want to save the CMOS data 9 Select Yes to save the changes and reboot the system 10 While rebooting turn off the system t...

Страница 131: ... System Security screen and return to the main menu 5 Press to exit the BIOS utility A dialog box appears asking if you want to save the CMOS data 6 Select Yes to save the changes Bypassing the Setup Password If you forget your setup password you can bypass the password security feature by hardware Follow these steps to bypass the password 1 Turn off and unplug the system 2 Open the system housing...

Страница 132: ...4 46 AcerAltos 21000 System Guide You can either change the existing Setup password or remove it by selecting None Refer to the previous section for the procedure ...

Страница 133: ...e Power on Password parameter Follow the same procedure as in setting the Setup password Make sure to set JP5 to pins 1 2 to enable the Power on Password Operation Mode This function lets you enable or disable the password prompt display When set to Normal the password prompt appears before system boot When set to Keyboard Lock the password prompt does not appear however your system will not respo...

Страница 134: ...time you turn on the system As long as the internal battery remains good approximately seven years and connected the clock continues to keep the date and time accurately even when the power is off The following screen appears if you select Date and Time from the main menu Date and Time Page 1 1 Date www mmm dd yyyy Time xx xx xx Move Highlight Bar Change Setting F1 Help ...

Страница 135: ...weekday month day and year are Weekday Sun Mon Tue Wed Thu Fri Sat Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day 1 to 31 Year 1980 to 2079 4 9 2 Time Highlight the items in the Time parameter and press or to set the time following the hour minute second format Valid values for hour minute and second are Hour 00 to 23 Minute 00 to 59 Second 00 to 59 ...

Страница 136: ...erAltos 21000 System Guide 4 10 Remote Diagnostic Configuration The Remote Diagnostic Configuration parameter allows you to configure your RDM settings Refer to the RDM User s Guide for more information on RDM ...

Страница 137: ...ettings some of the parameters are grayed out with their fixed settings These grayed parameters are not user configurable The following dialog box appears when you select Load Setup Default Settings from the main menu Do you want to load default settings Yes No Select Yes to load the default settings Select No to ignore the message and return to the BIOS utility ...

Страница 138: ... previous settings The following dialog box appears when you select Abort Settings Change from the main menu Do you want to abort settings change Yes No Select Yes to disregard your changes and reload your previous settings After reload the main menu appears on screen Select No to ignore the message and return to the BIOS utility ...

Страница 139: ... file NVRAM H W specific events Integrate with 3 rd party management software Provide visualization interface and statistics tools ASM Pro also detect record and recover hardware problems during POST Power On Self Test Checks the main board and housing status when system is first powered Recover critical events by isolating faulty CPU and memory Record all events into NVRAM These features are desi...

Страница 140: ...M Pro consists of two major parts ASM Station a Windows based monitoring station that communicates with the ASM Agents ASM Agent s the individual servers managed by the ASM Station Refer to the ASM Pro user s manual for more information ...

Страница 141: ...f failure and quickly return it to normal operation This capability to execute the RDM program from a remote site bridges the distance barrier in fixing server problems and reduces wasted time due to system failure Recover critical event by smart reboot isolate faulty CPU and reboot Monitor hardware status after OS is down Records all hardware events into NVRAM and notify system administration Run...

Страница 142: ...8h POST error In addition to 2 DWORD bitmap Acer BIOS defines a new byte to recognize POST error message ID 09h PCI parity error 0Ah PCI system error 0Bh CPU failure including cache error 10h System limit exceeded 14h System re configuration ESCD data changed 16h Log area Reset Cleared 81h Setup password fail 82h Power on password fail 83h 6 RDM events see next table 84h Unknown H W event detected...

Страница 143: ...A 4 AcerAltos 21000 System Guide ...

Страница 144: ... system if the temperature is at a safe degree Remote login password fail In Waiting mode if someone tries to connect in and there is a password fail RDM will record this event Remote login In Waiting mode someone logs in successfully Remote power off In Waiting mode Remote site powers off the system manually Remote reboot In Waiting mode Remote site reboots the system manually xx CPU IERR issued ...

Страница 145: ... Slave Drive Error 51 58 IDE 2 nd Channel Master Drive Error 52 59 IDE 2 nd Channel Slave Drive Error 53 59 CPU BIOS Update Code Mismatch 60 32 Real Time Clock Error 70 06 CMOS Battery Bad 71 03 CMOS Checksum Error 72 05 NVRAM Checksum Error 90 50 I O Resource Conflict s 120 40 Memory Resource Conflict s 121 39 IRQ Setting Error 122 41 Expansion ROM Allocation Failed 123 39 Onboard Serial 1 IRQ Co...

Страница 146: ...nboard Parallel I O Address Conflict s 192 60 Onboard Serial 1 Conflict s 193 61 Onboard Serial 2 Conflict s 194 62 Onboard Parallel Conflict s 195 60 Onboard IDE Primary Channel IRQ Conflict s 196 58 Onboard IDE Primary Channel I O Address Conflict s 197 58 ECC Facility Fail 210 35 I2C Interface or Device s Error 211 37 System Management RAM Bad 11 36 CPU Clock Mismatch 61 38 PnP ISA Card s Disab...

Страница 147: ... error 10h System limit exceeded 14h System re configuration ESCD data changed 16h Log area Reset Cleared 81h Setup password fail 82h Power on password fail 83h RDM events 84h Unknown H W event detected 85h CPU disabled by BIOS 86h I O Check Error 87h Wake up on LAN 88h AC power recovery ...

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