HP dc5850 Parallel Interface Support, Standard Parallel Port Mode, Enhanced Parallel Port Mode

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Input/Output Interfaces

5.5Parallel Interface Support

These systems include a system board header (P125) that supports an optional parallel bracket/cable assembly that provides a parallel interface for a peripheral device such as a printer. The parallel interface supports bi-directional 8-bit parallel data transfers with a peripheral device. The parallel interface supports three main modes of operation:

■Standard Parallel Port (SPP) mode

■Enhanced Parallel Port (EPP) mode

■Extended Capabilities Port (ECP) mode

These three modes (and their submodes) provide complete support as specified for an IEEE 1284 parallel port.

5.5.1 Standard Parallel Port Mode

The Standard Parallel Port (SPP) mode uses software-based protocol and includes two sub-modes of operation, compatible and extended, both of which can provide data transfers up to 150 KB/s. In the compatible mode, CPU write data is simply presented on the eight data lines. A CPU read of the parallel port yields the last data byte that was written.

5.5.2 Enhanced Parallel Port Mode

In Enhanced Parallel Port (EPP) mode, increased data transfers are possible (up to 2 MB/s) due to a hardware protocol that provides automatic address and strobe generation. EPP revisions 1.7 and 1.9 are both supported. For the parallel interface to be initialized for EPP mode, a negotiation phase is entered to detect whether or not the connected peripheral is compatible with EPP mode. If compatible, then EPP mode can be used. In EPP mode, system timing is closely coupled to EPP timing. A watchdog timer is used to prevent system lockup.

5.5.3 Extended Capabilities Port Mode

The Extended Capabilities Port (ECP) mode, like EPP, also uses a hardware protocol-based design that supports transfers up to 2 MB/s. Automatic generation of addresses and strobes as well as Run Length Encoding (RLE) decompression is supported by ECP mode. The ECP mode includes a bi-directional FIFO buffer that can be accessed by the CPU using DMA or programmed I/O. For the parallel interface to be initialized for ECP mode, a negotiation phase is entered to detect whether or not the connected peripheral is compatible with ECP mode. If compatible, then ECP mode can be used.

The ECP mode includes several sub-modes as determined by the Extended Control register. Two submodes of ECP allow the parallel port to be controlled by software. In these modes, the FIFO is cleared and not used, and DMA and RLE are inhibited.

 

Technical Reference Guide

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Contents October Technical Reference GuideTechnical Reference Guide Contents Input/Output Interfaces System SupportIntegrated Graphics Subsystem Power and Signal DistributionError Messages and Codes Index System BiosAbout this Guide IntroductionAdditional Information Sources Online ViewingNotational Conventions Serial NumberSpecial Notices ValuesCommon Acronyms and Abbreviations Acronyms and AbbreviationsAcronym or Abbreviation Description CDS Eisa LAN PAL Sdvo URL Introduction Introduction System OverviewFeatures SFF Feature Difference Matrix by Form FactorSystem Architecture HP Compaq dc5850 Business PC Architecture, Block diagram Chipset AMD Processor SupportChipset Components and Functionality Components FunctionSystem Memory Support ComponentsSupport Component Functions Component Name FunctionSerial Interface Mass StorageUniversal Serial Bus Interface Network Interface ControllerAudio Subsystem Integrated Graphics ProcessorIntegrated Graphics Subsystem Statistics Integrated Graphics ControllerEnvironmental Specifications Factory Configuration SpecificationsPower Supply Electrical Specifications Parameter Operating Non-operatingParameter SFF Physical SpecificationsSystem Overview Processor/Memory Subsystem Architecture Processor/Memory SubsystemAMD Processor Overview AMD ProcessorsProcessor Changing/Upgrading Supported Processors partial listingMemory Subsystem Memory Mapping and Pre-allocation Memory Loading/UpgradingMemory Socket Loading Channel a Channel B SocketSystem Memory Map for maximum of 8 gigabytes Processor/Memory Subsystem System Support PCI Bus OverviewPCI 2.3 Bus Operation PCI Express Bus Operation Device REQ/GNT Line PCI Connector SlotSoftware/Driver Layer Transaction Protocol LayerOption ROM Mapping PCI Power Management SupportPCI Interrupts Link LayerPCI Connectors PCI 2.3 ConnectorPCI 2.3 Bus Connector Pinout PCI Express Bus Connector Pinout PCI Express ConnectorsSystem Resources Apic ModeInterrupts ModeConnector PCI slot 1 J20 Direct Memory AccessPCI Interrupt Distribution System Interrupts System BoardClearing Cmos Real-Time Clock and Configuration MemorySystem Management Configuration Memory Cmos MapStandard Cmos Locations Security FunctionsPower-On / Setup Password Cable Lock ProvisionInterface Security Power Management Acpi Wake-Up EventsAcpi Wake-Up Event System Wakes From System Status System Status PowerLED Beeps Action RequiredThermal Sensing and Cooling System Operational Status LED IndicationsSystem I/O Map Register Map and Miscellaneous FunctionsPort Function System I/O MapGpio Functions SB700 FunctionsSIO Controller Functions System Support Input/Output Interfaces Pin Sata Connector Pinout Sata ConnectorSata Interfaces AHCI/RAID SupportFactory Configuration for RAID Implementing Ahci RAID for Non-Factory ConfigurationsRAID 1-Mirroring with Two Hard Drives Diskette Drive Interface Pin Signal Description Pin Diskette Drive Connector PinoutSerial Interface DB-9 Serial Connector PinoutEnhanced Parallel Port Mode Standard Parallel Port ModeExtended Capabilities Port Mode Parallel Interface SupportParallel Interface Connector DB-25 Parallel Connector PinoutPin Signal Function Keyboard Interface Operation Keyboard/Pointing Device InterfaceKeyboard/Pointing Device Interface Connector Keyboard/Pointing Device Connector PinoutPointing Device Interface Operation USB Connector Pinout USB ConnectorSB700 signals USB Connector Location Universal Serial Bus InterfaceUSB Cable Data Signal Insulation colorUSB Cable Length Data USB Color CodeAudio Subsystem Audio Subsystem Functional Block DiagramHD Audio Controller HD Audio Link BusAudio Multistreaming Audio Specifications HD Audio Subsystem SpecificationsParameter Measurement LAN I/F NIC Network Interface ControllerPower Management Support Wake-On-LAN SupportAlert Standard Format Support NIC Specifications NIC ConnectorNIC Specifications Parameter Compatibility standard orprotocolIntegrated Graphics Processor Functional Description Integrated Graphics Processor, Block diagramUpgrading Monitor Connectors Analog Monitor ConnectorDB-15 Monitor Connector Pinout DVI-D Connector DVI-D Monitor Connector PinoutPin Signal Integrated Graphics Processor Power Distribution Power and Signal DistributionSFF Power Supply SFF 240-Watt Power Supply Unit SpecificationsMin Range Current Max Surge Tolerance Loading Ripple MT Power Supply MT 300-Watt Power Supply Unit SpecificationsRange or Min Current Max Surge Tolerance Loading Ripple Power Button Power ControlPower Button Actions Pressed Power Button ResultsPower LED Indications Condition Wake-On-LAN Wake Up EventsPower Transition OS Restart System Power StatesState System Condition Consumption To S0 by RequiredSignal Distribution System Board Component DesignationsDesignator Component function Shows pinouts of headers used on the sytem boards Power and Signal Distribution System Bios ROM Flashing UpgradingChangeable Splash Screen Boot Device Order Boot FunctionsNetwork Boot F12 Support Memory Detection and ConfigurationBoot Error Codes Boot Error CodesVisual power LED Audible speaker Meaning Function Mode Client Management FunctionsClient Management Functions INT15 System ID and ROM Type Temperature StatusSystem ID Numbers System System ID Form Factor Subsystem Device IDType Data Smbios FunctionsManagement Functions USB Legacy SupportBeep/Power LED Codes Error Messages and CodesTable A-1 Beep/Power LED Codes Beeps Power LED Probable CausePower-On Self Test Post Messages Table A-2 Error Messages and Codes Table A-3 System Error Messages Probable Cause System Error MessagesMemory Error Messages Memory Error MessagesTable A-4 Message Probable CauseTable A-5 Keyboard Error Messages Probable Cause Keyboard Error MessagesVideo Graphics Error Messages Printer Error MessagesTable A-6 Printer Error Messages Probable Cause Table A-7 Video Graphics Error Messages Probable CauseTable A-8 Diskette Drive Error Messages Probable Cause Diskette Drive Error MessagesTable A-9 Serial Interface Error Messages Probable Cause Serial Interface Error MessagesModem Communications Error Messages System Status Error Messages System Status Error MessagesTable A-11 Table A-12 Hard Drive Error Messages Probable Cause Hard Drive Error MessagesXx = 03, Hard drive read/write compare test Table A-13 Hard Drive Error Messages Probable Cause Audio Error Messages Table A-14 Video Graphics Error Messages Probable CauseTable A-15 Audio Error Messages Probable Cause Network Interface Error Messages 17 DVD/CD-ROM Error MessagesDVD/CD-ROM Error Messages Table A-17 Network Interface Error Messages Probable CauseTable A-18 Scsi Interface Error Messages Scsi Interface Error Messages 65xx-xx, 66xx-xxPointing Device Interface Error Messages 8601-xx Error Messages and Codes Numerics IndexIndex
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dc5850 specifications

The HP dc5850 is a desktop computer that was designed for business environments, offering a blend of performance, reliability, and efficiency. Released during the height of the mid-2000s, this system is powered by AMD processors, particularly the Athlon or Phenom series, which ensures that it can handle various computational tasks with ease.

The dc5850 features a compact chassis that adheres to the Microtower form factor. This design not only saves space but also allows for easier upgrades and maintenance. The unit typically supports a range of RAM configurations, with options for up to 8GB of DDR2 memory. This flexibility enables the user to tailor the system's performance according to their needs, whether for basic office tasks or more demanding applications.

Storage options on the HP dc5850 include a 3.5-inch HDD that can accommodate substantial data, with capacities typically ranging from 160GB to 1TB. The inclusion of a SATA interface ensures fast data transfer rates, which is essential for improving overall system performance. Moreover, the dc5850 boasts multiple USB ports, including USB 2.0 and sometimes even USB 3.0, facilitating easy connectivity with peripherals such as printers, scanners, and external drives.

Graphics capabilities on the dc5850 are generally provided by integrated solutions, although users have the option to add discrete graphics cards for enhanced performance in visual tasks. The system often comes with integrated audio, which supports basic multimedia needs without requiring additional sound cards.

In terms of connectivity, the HP dc5850 features built-in Ethernet for wired networking and may also offer options for Wi-Fi capabilities via PCI expansion slots. This makes it suitable for networked business environments, enabling seamless integration into office infrastructures.

The system is designed with energy efficiency in mind, complying with various environmental standards, thereby reducing its carbon footprint. This aspect may also lead to lower operational costs for businesses focused on sustainability.

Overall, the HP dc5850 stands out as a versatile desktop solution, catering to the essential needs of small to medium-sized businesses. With its combination of performance, expandability, and energy efficiency, it remains a noteworthy choice for users seeking reliable computing power in a compact and manageable form.
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