HP dc7800 tower System Management, Standard Cmos Locations, Security Functions, Location Function

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System Support

4.4.2 Standard CMOS Locations

Table 4-6 describes standard configuration memory locations 0Ah-3Fh. These locations are accessible through using OUT/IN assembly language instructions using port 70/71h or BIOS function INT15, AX=E823h.

Table 4-6.

Configuration Memory (CMOS) Map

Location	Function	Location	Function
00-0Dh	Real-time clock	24h	System board ID
0Eh	Diagnostic status	25h	System architecture data
0Fh	System reset code	26h	Auxiliary peripheral configuration
10h	Diskette drive type	27h	Speed control external drive
11h	Reserved	28h	Expanded/base mem. size, IRQ12
12h	Hard drive type	29h	Miscellaneous configuration
13h	Security functions	2Ah	Hard drive timeout
14h	Equipment installed	2Bh	System inactivity timeout
15h	Base memory size, low byte/KB	2Ch	Monitor timeout, Num Lock Cntrl
16h	Base memory size, high byte/KB	2Dh	Additional flags
17h	Extended memory, low byte/KB	2Eh-2Fh	Checksum of locations 10h-2Dh
18h	Extended memory, high byte/KB	30h-31h	Total extended memory tested
19h	Hard drive 1, primary controller	32h	Century
1Ah	Hard drive 2, primary controller	33h	Miscellaneous flags set by BIOS
1Bh	Hard drive 1, secondary controller	34h	International language
1Ch	Hard drive 2, secondary controller	35h	APM status flags
1Dh	Enhanced hard drive support	36h	ECC POST test single bit
1Eh	Reserved	37h-3Fh	Power-on password
1Fh	Power management functions	40-FFh	Feature Control/Status

NOTES:

Assume unmarked gaps are reserved.

Higher locations (>3Fh) contain information that should be accessed using the INT15, AX=E845h BIOS function (refer to Chapter 8 for BIOS function descriptions).

4.5 System Management

This section describes functions having to do with security, power management, temperature, and overall status. These functions are handled by hardware and firmware (BIOS) and generally configured through the Setup utility.

4.5.1 Security Functions

These systems include various features that provide different levels of security. Note that this subsection describes only the hardware functionality (including that supported by Setup) and does not describe security features that may be provided by the operating system and application software.

4-10

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Technical Reference Guide

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Contents

Technical Reference Guide SeptemberTechnical Reference Guide Contents System Support Processor/Memory SubsystemInput/Output Interfaces Power and Signal Distribution Integrated Graphics SubsystemSystem Bios Error Messages and Codes IndexAdditional Information Sources IntroductionAbout this Guide Online ViewingSpecial Notices Serial NumberNotational Conventions ValuesAcronyms and Abbreviations Common Acronyms and AbbreviationsAcronym or Abbreviation Description CMC CDSCGA CmosEide EisaEPP EscdLAN IRQISA LCDPata ODDPAL PCASecam SdvoSEC SgramUTP URLUSB VACIntroduction System Overview IntroductionFeatures Sodimm Dimm Feature Difference Matrix by Form Factor1ODD Architectural Differences By Form Factor System ArchitectureFunction HP Compaq dc7900 Business PC Architecture, Block diagram Intel Processor Support Chipset Components and Functionality ChipsetComponents Function Support Component Functions Support ComponentsSystem Memory Component Name FunctionUniversal Serial Bus Interface Mass StorageSerial Interface Network Interface ControllerIntegrated Graphics Subsystem Statistics Graphics SubsystemAudio Subsystem Integrated Graphics ControllerPower Supply Electrical Specifications SpecificationsEnvironmental Specifications Factory Configuration Parameter Operating Non-operatingPhysical Specifications Parameter Usdt SFF CMTParameter Optical Drive SpecificationsHP SuperMulti LightScribe CD-RW/DVD-ROM ComboHard Drive Specifications Parameter 80 GB 160 GB 250 GBProcessor/Memory Subsystem Processor/Memory Subsystem ArchitectureIntel Processors Intel Processor OverviewClock Processor Changing/UpgradingSupported Processors partial listing FormMemory Subsystem Memory Socket Loading Memory UpgradingMemory Mapping and Pre-allocation Channel a Channel B Socket Socket 2 Socket 4 TotalSystem Memory Map for maximum of 8 gigabytes PCI Bus Overview System SupportPCI 2.3 Bus Operation PCI Component Configuration Access PCI Bus PCI Component Function # Device # Wired toTransaction Protocol Layer PCI Express Bus OperationSoftware/Driver Layer PCI Bus Mastering DevicesPCI Interrupts PCI Power Management SupportOption ROM Mapping Link LayerPCI 2.3 Connector PCI ConnectorsPCI 2.3 Bus Connector Pinout PCI Express Connectors PCI Express Bus Connector PinoutInterrupts Apic ModeSystem Resources ModeDirect Memory Access PCI Interrupt DistributionReal-Time Clock and Configuration Memory Clearing CmosStandard Cmos Locations Configuration Memory Cmos MapSystem Management Security FunctionsCable Lock Provision Power-On / Setup PasswordSetup Password Interface SecurityAcpi Wake-Up Events Power ManagementSmart Cover Lock Optional Acpi Wake-Up Event System Wakes FromThermal Sensing and Cooling System Status PowerLED Beeps Action RequiredSystem Status System Operational Status LED IndicationsRegister Map and Miscellaneous Functions System I/O MapSystem I/O Map Port FunctionICH10 Functions Gpio FunctionsSIO Controller Functions Input/Output Interfaces Sata interface Pin Sata Connector PinoutSATA/eSATA Interfaces Pin DescriptionOptional eSATA Bracket/Cable Assembly ESATA interfaceDiskette Drive Interface Pin Diskette Drive Connector Pinout Pin Signal DescriptionDB-9 Serial Connector Pinout Serial InterfaceExtended Capabilities Port Mode Standard Parallel Port ModeEnhanced Parallel Port Mode Parallel Interface SupportDB-25 Parallel Connector Pinout Parallel Interface ConnectorPin Signal Function Keyboard/Pointing Device Interface Keyboard Interface OperationPointing Device Interface Operation Keyboard/Pointing Device Interface ConnectorKeyboard/Pointing Device Connector Pinout DataUniversal Serial Bus Interface USB ConnectorController Signals USB Connector Location all form factors ICH10 USB Port MappingUSB Cable Length Data USB Connector PinoutUSB Cable Data USB Color CodeAudio Subsystem Functional Block Diagram Audio SubsystemHD Audio Link Bus HD Audio ControllerAudio Multistreaming Parameter Measurement Audio SpecificationsHD Audio Subsystem Specifications ADC/DACNetwork Interface Controller LAN I/F NICWake-On-LAN Support Power Management SupportAlert Standard Format Support NIC Specifications NIC ConnectorNIC Specifications Parameter Compatibility standard orprotocolIntegrated Graphics Subsystem Functional Description RGBSdram Installed Maximum Memory Allocation GMA 4500 Memory AllocationDisplay Modes Resolution Maximum Refresh Rate Analog Digital MonitorIGC Standard 2D Display Modes Upgrading Analog Monitor Connector Monitor ConnectorsDB-15 Monitor Connector Pinout DisplayPort Connector Pin SignalIntegrated Graphics Subsystem Power Distribution Power and Signal DistributionUsdt Power Distribution 2 SFF/CMT Power Distribution Usdt 135-Watt Power Supply Unit SpecificationsSFF 240-Watt Power Supply Unit Specifications Min Range Current Max Surge Tolerance Loading RippleCMT 365-Watt Power Supply Unit Specifications Range or Min Current Max Surge Tolerance Loading RippleShows the power supply cabling for CMT systems Energy Star CompliancyPower Button Actions Power ControlPower Button Pressed Power Button ResultsPower LED Indications Condition Wake Up Events Wake-On-LANState System Condition System Power StatesPower Transition OS Restart Consumption To S0 by RequiredSignal Distribution CR1 +5 VDC LEDSystem Board Component Designations Power and Signal Distribution System Bios Upgrading ROM FlashingChangeable Splash Screen Network Boot F12 Support Boot FunctionsBoot Device Order Memory Detection and ConfigurationBoot Error Codes Boot Error CodesVisual power LED Audible speaker Meaning Client Management Functions Function ModeClient Management Functions INT15 System ID Numbers Temperature StatusSystem ID and ROM Type SubsystemSmbios Functions Type DataUSB Legacy Support Management Engine FunctionsTable A-1 Beep/Power LED Codes Error Messages and CodesBeep/Power LED Codes Beeps Power LED Probable CausePower-On Self Test Post Messages Table A-2 Error Message Probable Cause Table A-2System Error Messages Table A-3 System Error Messages Probable CauseTable A-4 Memory Error MessagesMemory Error Messages Message Probable CauseKeyboard Error Messages Table A-5 Keyboard Error Messages Probable CauseTable A-6 Printer Error Messages Probable Cause Printer Error MessagesVideo Graphics Error Messages Table A-7 Video Graphics Error Messages Probable CauseDiskette Drive Error Messages Table A-8 Diskette Drive Error Messages Probable CauseSerial Interface Error Messages Table A-9 Serial Interface Error Messages Probable CauseModem Communications Error Messages System Status Error Messages System Status Error MessagesTable A-11 Hard Drive Error Messages Table A-12 Hard Drive Error Messages Probable CauseXx = 03, Hard drive read/write compare test Table A-13 Hard Drive Error Messages Probable Cause Table A-14 Video Graphics Error Messages Probable Cause Audio Error MessagesTable A-15 Audio Error Messages Probable Cause DVD/CD-ROM Error Messages 17 DVD/CD-ROM Error MessagesNetwork Interface Error Messages Table A-17 Network Interface Error Messages Probable CauseScsi Interface Error Messages 65xx-xx, 66xx-xx Table A-18 Scsi Interface Error MessagesPointing Device Interface Error Messages 8601-xx Error Messages and Codes Index NumericsIndex

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