Compaq dc7800 Technical Reference Guide: HP Compaq dc7800 Series Business Desk
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- Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 1
Technical Reference Guide HP Compaq dc7800 Series Business Desktop Computers Document Part Number: 461444-001 October 2007 This document provides information on the design, architecture, function, and capabilities of the HP Compaq dc7800 Series Business Desktop Computers. This information may be - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 2
HP products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty. HP Company. Technical Reference Guide HP Compaq dc7800 Series Business Desktop Computers First Edition ( - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 3
2.3.1 Intel Processor Support 2-6 2.3.2 Chipset 2-7 2.3.3 Support Components 2-8 2.3.4 System Memory 2-8 2.3.5 Mass Storage 2-9 2.3.6 Serial and Parallel Interfaces 2-9 2.3.7 Universal Serial Bus Interface 2-9 2.3.8 Network Interface Controller 2-9 2.3.9 Graphics Subsystem 2-10 2.3.10Audio - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 4
3.3.1 Memory Upgrading 3-5 3.3.2 Memory Mapping and Pre-allocation 3-5 4 System Support 4.1 Introduction 4-1 4.2 PCI Bus Overview 4-1 4.2.1 PCI 2.3 Bus Operation 4-1 4.2.2 PCI Express Bus Operation 4-3 4.2.3 Option ROM Mapping 4-4 4.2.4 PCI Interrupts 4-4 4.2.5 PCI Power Management Support - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 5
USDT Power Distribution 7-1 7.2.2 SFF Power Distribution 7-2 7.2.3 CMT Power Distribution 7-4 7.2.4 Energy Star Compliancy 7-5 7.3 Power Control 7-6 7.3.1 Power Button 7-6 7.3.2 Wake Up Events 7-8 7.3.3 Power Management 7-9 7.4 Signal Distribution 7-10 Technical Reference Guide www.hp - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 6
Contents 8 SYSTEM BIOS 8.1 Introduction 8-1 8.2 ROM Flashing 8-2 8.2.1 Upgrading 8-2 8.2.2 Changeable Splash Screen 8-2 8.3 Boot Functions 8-3 8.3.1 Boot Device Order 8-3 8.3.2 Network Boot (F12) Support 8-3 8.3.3 Memory Detection and Configuration 8-3 8.3.4 Boot Error Codes 8-4 8.4 Client - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 7
1 Introduction 1.1 About this Guide This guide provides technical information about HP Compaq dc7800 Business PC personal computers that feature Intel processors and the Intel Q35 Express chipset. This document describes in detail the system's design and operation for programmers, engineers, - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 8
Introduction 1-2 www.hp.com Technical Reference Guide - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 9
on a sticker placed on the exterior cabinet. The serial number is also written into firmware and may be read with HP Diagnostics or Insight Manager utilities. 1.5 Notational Conventions The notational guidelines used in this guide are described in the following subsections. 1.5.1 Special Notices - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 10
modem commands) 2. 286-based PC architecture ATA AT attachment (IDE protocol) ATAPI ATA w/packet interface extensions AVI audio-video interleaved AVGA Advanced VGA AWG American Wire Gauge (specification) BAT Basic assurance test BCD binary-coded decimal BIOS basic input/output system - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 11
random access memory data request Digital video interface Double word (32 bits) extended display identification data extended data out (RAM type) electrically erasable PROM enhanced graphics adapter Electronic Industry Association extended ISA enhanced parallel port enhanced IDE www.hp.com 1-5 - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 12
RAM type) Floating point unit (numeric or math coprocessor) Frames per second Foot/feet gigabyte Graphics/memory controller hub ground general purpose I/O general purpose open-collector Graphics address re-mapping table graphic flag interface integrated graphics controller inch - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 13
Guide Memory controller hub multimedia extensions Motion Picture Experts Group millisecond most significant bit/most significant byte multiplex motion video acceleration motion video window memory operating system 1. programmable array logic 2. phase alternating line Parallel ATA Introduction www.hp - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 14
per minute real time clock Read/Write Serial ATA small computer system interface Singles data rate (memory) Synchronous Dynamic RAM Serial digital video output Single Edge-Connector sequential colour avec memoire (sequential color with memory) sign flag www.hp.com Technical Reference Guide - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 15
Reference Guide Table 1-1 (Continued) Acronyms and Abbreviations Description Synchronous Graphics RAM Single instruction multiple data single in-line memory module Self Monitor Analysis Report Technology system management interrupt system management mode system management RAM serial presence - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 16
Acronyms and Abbreviations Description Volts alternating current Volts direct current Video Electronic Standards Association video graphics adapter very large scale integration Video RAM watt Wake-On-LAN Windows RAM zero flag zero insertion force (socket) 1-10 www.hp.com Technical Reference Guide - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 17
models feature a similar architecture incorporating both PCI 2.3 and PCIe buses. All models are easily upgradeable and expandable to keep pace with the needs of the office enterprise. HP dc7800 USDT HP dc7800 SFF Figure 2-1. HP Comapq dc7800 Business PCs This chapter includes the following topics - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 18
(AMT) 3.0 on select models ■ Security features including: ❏ Flash ROM Boot Block ❏ Diskette drive disable, boot disable, write protect ❏ Power-on password ❏ Administrator password ❏ Serial/parallel port disable (SFF and CMT form factors only) ❏ Hood (cover) sense ❏ Hoodlock (SFF and CMT form factors - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 19
the different PC series based on form factor: Table 2-1 Feature Difference Matrix by Form Factor USDT SFF CMT Memory: # & type of sockets Maximum memory 2 SODIMM 4GB 4 DIMM 8GB 4 DIMM 8GB Serial ports 0 1 std., 1 opt. [1] 1 std., 1 opt. [1] Parallel ports 0 1 1 DVI-D graphics port - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 20
Differences By Form Factor Function USDT SFF CMT Memory sockets 2 SODIMMs 4 DIMMs 4 DIMMs PCIe x16 graphics slot? No Yes [1] Yes # of PCIe x1 slots 1 [2] 2 [1] 2 # of PCI 2.3 slots 0 1 [3] 3 Serial / parallel ports 0 1 [4] 1 [4] Parallel ports 0 1 1 SATA interfaces - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 21
in SFF, 3 slots in CMT [4] 1 MiniCard slot in USDT, 2 slots in SFF, 2 slots in CMT [5] 8 ports accessible externally, 2 ports accessible internally Keyboard Diskette [2] Mouse Power Supply Figure 2-2. HP Comapq dc7800 Business PC Architecture, Block diagram Technical Reference Guide www.hp - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 22
package. CAUTION: The USDT form factor can support a processor rated up to 65 watts. The SFF and CMT form factors can support a processor rated up form factors. Always use the same assembly or one of the same type when replacing the processor. Refer to the applicable Service Reference Guide - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 23
(SFF and CMT only) SDRAM controller supporting unbuffered, non-ECC PC2-6400 DDR2 DIMMs or SODIMMs 800-, 1066-, or 1333-MHz FSB PCI 2.3 bus I/F PCI Express x1 LPC bus I/F SMBus I/F SATA I/F HD audio interface RTC/CMOS IRQ controller Power management logic USB 1.1/2.0 controllers supporting 12 ports - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 24
. The USDT system provides two SODIMM sockets supporting up to four gigabytes of memory while the SFF and CMT form factors provide four DIMM sockets and support a total of eight gigabytes of memory. ✎ SODIMM and DIMM components are NOT interchangeable. 2-8 www.hp.com Technical Reference Guide - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 25
Interfaces The SFF and CMT form factors include a serial port and a parallel port, both of which are accessible at the rear of the chassis. The SFF and CMT form factors may be upgraded with a second serial port option. The serial interface is RS-232-C/16550-compatible and supports standard baud - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 26
1 RGB The IGC supports dual independent display for expanding the desktop viewing area across two monitors. The USDT form factor includes a DVI-D interface for direct connection with a digital video monitor. The graphics subsystem of the SFF and CMT systems can be upgraded by installing an SDVO - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 27
-60 Hz 47-63 Hz Energy Star 4.0 with 80 Plus compliancy USDT SFF & CMT Standard Optional Maximum Continuous Power: USDT SFF CMT 135 watts 240 watts 365 watts NOTE: Energy Star 4.0 with 80 Plus compliancy option available for SFF and CMT form factors. Technical Reference Guide www.hp.com 2-11 - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 28
35 kg) 77.1 lb (35 kg) 77.1 lb (35 kg) NOTES: [1] System configured with 1 hard drive, 1 diskette drive (SFF and CMT only), and no PCI cards. [2] Desktop (horizontal) configuration. [3] Minitower configuration. For desktop configuration, swap Height and Width dimensions. [4] Applicable to unit in - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 29
-to-Track (high/low) Average (high/low) Settling Time Latency Average 3 ms/6 ms 94 ms/169 ms 15 ms 100 ms System Overview Technical Reference Guide www.hp.com 2-13 - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 30
[1] SATA [1] Max. read/write speeds DVD-RAM: 4x/na by media type DVD+RW: CD-RW: 32x/na CD-R: 48x/na DVD-RAM: 12x/12x DVD+RW: 8x/8x DVD- -RW: 32x/32x CD-R: 48x/48x DVD-RAM: 12x/12x DVD+RW: 8x/8x DVD- NOTE [1] USDT models use "slim" drive that uses an IDE interface through SATA bridge. [2] - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 31
: [1] USDT supports 2.5-in. drives only. [2] USDT supports 1.5 Gb/s drives only. [3] USDT supports up to 7200-RPM drives only. [4] Supported by SFF and CMT form factors only. 250 GB [4] 3.5 in SATA 3.0 Gb/s Yes 1.0 ms 11 ms 18 ms 488,397,168 7200 RPM SMART IV Technical Reference Guide www.hp.com - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 32
System Overview 2-16 www.hp.com Technical Reference Guide - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 33
families and use the Q35 chipset (Figure 3-1). These systems support PC2-6400 and PC2-5300 DDR2 memory modules. Intel Processor FSB I/F XMM1 DIMM or SODIMM XMM2 [1] DIMM Intel Q35 GMCH SDRAM Cntrl Channel A Channel B Note: [1] Not present on USDT form factor. DIMM or SODIMM XMM3 DIMM - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 34
changed for upgrading. 3.2.1 Intel Processor Overview The models covered in this guide support Intel Celeron, support provided by previous Pentium processors, the Pentium 4 processor includes an additional 144 MMX instructions, further enhancing: ❏ Streaming video/audio processing ❏ Photo/video - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 35
: The USDT form factor can support a processor with a maximum power consumption of 65 watts. The SFF and CMT form factors can support a processor with a maximum power consumption of 95 watts. Exceeding these limits can result in system damage and lost data. Technical Reference Guide www.hp.com - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 36
-ECC PC2-5300 and PC2-6400 DDR2 memory. The USDT form factor supports up to four gigabytes of memory while the SFF and CMT form factors support up to eight gigabytes of memory. ✎ The DDR SDRAM "PCxxxx" reference designates bus bandwidth (i.e., a PC2-5300 module can, operating at a 667-MHz effective - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 37
) NOTE: [1] USDT form factor uses SODIMM sockets. SFF and CMT form factors use DIMM sockets. [2] Not present on USDT form factor. HP recommends using symmetrical loading (same-capacity, same-speed modules across both channels) to achieve the best performance. CAUTION: Always power down the system - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 38
(for maximum of 8 gigabytes) ✎ All locations in memory are cacheable. Base memory is always mapped to DRAM. The next 128 KB fixed memory area can, through the north bridge, be mapped to DRAM or to PCI space. Graphics RAM area is mapped to PCI locations. 3-6 www.hp.com Technical Reference Guide - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 39
4 System Support 4.1 Introduction This chapter covers subjects dealing with basic system architecture and covers the following topics: ■ PCI bus overview (4.2) ■ System resources (4.3) ■ Real-time clock and configuration memory (4.4) ■ System management (4.5) ■ Register map and miscellaneous - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 40
[1] Function not used in these systems. [2] Mapping for USB 1.1 Controller #4 if USB ports 9 and 10 and USB 2.0 Controller #2 are disabled. Otherwise, mapping for USB 1.1 controller #4 is F0:D25. [3] SFF and CMT form factors only. [4] CMT form factor only 4-2 www.hp.com Technical Reference Guide - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 41
the devices on the PCI bus. Table 4-2. PCI Bus Mastering Devices Device REQ/GNT Line PCI Connector Slot 1 REQ0/GNT0 PCI Connector Slot 2 REQ1/GNT1 PCI Connector Slot 3 REQ2/GNT2 Note [1] [1] [2] NOTE: [1] SFF and CMT form factors only. [2] CMT form factor only PCI bus arbitration is based - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 42
Support This system complies with the PCI Power Management Interface Specification (rev 1.0). The PCI Power Management Enable (PME-) signal is supported by the chipset and allows compliant PCI peripherals to initiate the power management routine. 4-4 www.hp.com Technical Reference Guide - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 43
4.2.6 PCI Connectors PCI 2.3 Connector A1 System Support A49 A52 A62 B2 B49 B52 B62 Figure 4-2. 32-bit, 5.0-volt PCI 2.3 Bus Connector Pin B Signal 01 -12 VDC 02 TCK 03 GND 04 BE0- +3.3 VDC AD06 AD04 GND AD02 AD00 +5 VDC REQ64+5 VDC +5 VDC Technical Reference Guide www.hp.com 4-5 - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 44
System Support PCI Express Connectors A1 A11 A12 A18 x1 Connector A82 x16 Connector B1 B11 B12 B82 Figure 4-3. PCI Express Bus Connectors Pin B Signal 01 +12 VDC 02 +12 VDC 03 RSVD PERn13 GND GND PERp14 PERn14 GND GND PERp15 PERn15 GND 4-6 www.hp.com Technical Reference Guide - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 45
Support and CLI instructions. A INTA-H (PCI) or IRQ0 services the peripheral as appropriate. Most IRQs are routed through the I/O controller of the super I/O component, which provides the serializing function. A serialized PCI interrupt signals (PIRQA-..PIRQH-) for use by PCI devices. The PCI - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 46
PIRQ G C B A PIRQ H D C B NOTES: [1] SFF and CMT only [2] CMT only The PCI interrupts can be configured by PCI Configuration Registers 60h..63h to share the standard ISA interrupts (IRQn). ✎ The APIC mode is supported by Windows NT, Windows 2000, and Windows XP, and Windows Vista operating systems - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 47
00-0Dh) of the standard memory area. All locations of the standard memory area (00-7Fh) can be directly accessed using conventional OUT and IN assembly language instructions through I/O ports 70h/71h, although the suggested method is to use the INT15 AX=E823h BIOS call. 0Dh Register D 0Ch Register - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 48
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. Location 00-0Dh 0Eh 0Fh 10h 11h 12h 13h 14h 15h - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 49
power cord from the outlet and/or system unit. 2. Remove the cover (hood) as described in the appropriate User Guide or Maintainance And Service Reference Guide disabling of the serial, parallel, and diskette interfaces are a function of the SCH5317 I/O controller. The USB ports are controlled - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 50
System Wakes From Power Button Suspend or soft-off RTC Alarm Suspend or soft-off Wake On LAN (w/NIC) Suspend or soft-off PME Suspend or soft-off Serial Port Ring Suspend or soft-off USB Suspend only Keyboard Suspend only Mouse Suspend only 4-12 www.hp.com Technical Reference Guide - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 51
Power supply overload failure Blinks red 4 times @ I Hz [1] 4 Check system board problem [3], Memory error (pre-video) Blinks red 5 times @ I Hz [1] 5 Check DIMMs, system board Video error Blinks red 6 times @ I Hz [1] 6 Check graphics card or system board PCA failure detected by BIOS - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 52
System Support ✎ Units using chassis and CPU fans must have both fans connected to their corresponding headers to ensure proper cooling of ICH9 and I/O controller. 4.6.1 System I/O Map Table 4-9 lists the fixed addresses of the input/output (I/O) ports. 4-14 www.hp.com Technical Reference Guide - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 53
(LPT1) Graphics Controller Parallel Port (LPT3) Serial Port (COM3) Diskette Drive Controller Primary Addresses IDE Controller 1 (active only if standard I/O space is enabled for sec. drive) Serial Port (COM1) Interrupt Controller Parallel Port (LPT2) Parallel Port (LPT1) Parallel Port (LPT3) PCI - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 54
security override ■ Serial port detect ■ REQn#/GNTn# sigal control ■ Password enable ■ Boot block enable I/O Controller Functions In addition to the serial and parallel port functions, the SCH5327 I/O controller provides the following specialized functions through GPIO ports: ■ Power/Hard drive LED - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 55
provide input and output (I/O) porting of data and that are controlled Serial interfaces (5.5) ■ Parallel interface (5.6) ■ Keyboard/pointing device interface (5.7) ■ Universal serial bus interface (5.8) ■ Audio subsystem (5.9) ■ Network interface controller (5.10) Technical Reference Guide www.hp - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 56
, three, or four serial ATA (SATA) interfaces that support tranfer rates up to status reporting of the RAID array, and the BIOS ROM also supports RAID creation, naming, and deletion of RAID B Holding clip 5 RX negative -- -- ✎ The USDT system includes a notebook-type SATA connector (J102) that - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 57
Interface The USDT system board includes a SATA-to-PATA bridge and slim IDE connector that supports an IDE-type optical disk drive. The pinout for this connector is listed in Table 5-2 The 44-pin slim IDE connector 41 5V 42 5V 22 GND 43 GND 44 Reserved Technical Reference Guide www.hp.com 5-3 - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 58
5.4 Diskette Drive Interface The SFF and CMT form factors support a diskette drive through a standard the DRQ2 and DACK2- signals for control. The Results phase consists of the CPU reading a series of status bytes (from the data register (3F5h/375h)) 5-4 www.hp.com Technical Reference Guide - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 59
Input/Output Interfaces The SFF and CMT form factors use a standard 34-pin connector for diskette drives (refer to Figure 5-3 and Table 5-3 for the pinout). Drive power is supplied through a separate connector. 2 4 6 8 10 12 14 door opened indicator Technical Reference Guide www.hp.com 5-5 - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 60
through an adapter that consists of a PCI bracket and a cable that attaches to header P52 on the system board. The serial interface function is provided by the SCH5317 I/O controller component that includes two NS16C550-compatible UARTs. The UART supports the standard baud rates up through 115200 - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 61
three modes (and their submodes) provide complete support as specified for an IEEE 1284 parallel port. 5.6.1 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 - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 62
Note that some signals are redefined depending on the port's operational mode. Figure 5-5. DB-25 Parallel 10 ACK- Data 7 Acknowledge / Interrupt [1] 22 GND 23 GND Ground Ground 11 BSY Busy / Wait [1] 24 GND Ground 12 PE 13 SLCT Paper End / User defined [1] hp.com Technical Reference Guide - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 63
compatible keyboard controller logic (hereafter referred to as simply the "8042") to communicate with the keyboard and pointing device using bi-directional serial data transfers. The 8042 handles scan code codes CPU transferred serially, LSb of Code EDh, code. If a parity error or timeout - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 64
Pointing Device Interface Connector (as viewed from rear of chassis) Table 5-6. Keyboard/Pointing Device Connector Pinout Pin Signal Description Pin Signal Description 1 DATA Data 4 + 5 VDC Power 2 NC Not Connected 5 CLK Clock 3 GND Ground 6 NC Not Connected 5-10 www - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 65
system configuration changes without powering down or even rebooting systems. These systems provide eight externally-accessible USB ports, two front panel USB ports (which may be disabled) and six USB ports on the rear panel. In addition, the SFF and CMT form factors support a media reader accessory - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 66
: For sub-channel (1.5 MB/s) operation and/or when using sub-standard cable shorter lengths may be allowable and/or necessary. The shield, chassis ground, and power ground should be tied together at the host end but left unconnected at the device end to avoid ground loops. Table 5-10. USB Color - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 67
or to powered speakers that contain amplifiers. Front Panel Mic In Rear Panel Line In [1] 82801 ICH HD Audio Interface PC Beep HD Audio I/F Header P23 Mic Audio (L/R) Line Audio (L/R) Speaker Audio (mono) AD1884 HD Audio Codec Header Headphone P23 Audio (L/R) Line Audio Out (L/R) Audio Amp - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 68
access to audio codec registers ■ Support for greater than 48-KHz sampling ■ HD audio interface 5.9.2 HD Audio Link Bus The HD audio controller and the HD audio codec communicate over a five-signal HD Audio Link Bus (Figure 5-10). The HD Audio Interface includes two serial data lines; serial data - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 69
listed in Table 5-11. Table 5-11. HD Audio Subsystem Specifications Parameter Measurement Sampling Rates: DAC ADC 44 out Headphone out Microphone / line in -84 db -80 db -78 db Max. Subsystem Power Output to 4-ohm Internal Speaker (with 10% THD): 1.5 watts Gain Step 1.5 db Master Volume - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 70
11). The support firmware for the BCM5752 component is contained in the system (BIOS) ROM. Windows XP and Linux ■ Multiple VLAN support with Windows XP ■ Power management support for ACPI 1.1, PXE 2.0, WOL, ASF 1.0, IPMI, AMT 3.0 ■ Cisco Etherchannel support ■ Link and Activity LED indicator drivers - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 71
of system wake up is implemented through an ACPI-compliant OS and is the default power management mode. The following wakeup events may be individually enabled/disabled through the supplied software driver: ■ Magic Packet-Packet with node address repeated 16 times in data portion ✎ The following - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 72
, XP Home, XP Pro, Vista Home, Vista Pro MS Windows NT 3.51 & 4.0 Novell Netware 3.x, 4.x, 5x Novell Netware/IntraNetWare SCO UnixWare 7 Linux 2.2, 2.4 PXE 2.0 Intel PRO/100 Boot Agent (PXE 3.0, RPL) Yes PCI Express x1 ACPI, PCI Power Management Spec. 5-18 www.hp.com Technical Reference Guide - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 73
the Q35 GMCH component. This graphics subsystem employs the use of system memory to provide efficient, economical 2D and 3D performance. The SFF and CMT systems may be upgraded/modified by: ■ Installing a PCIe x16 graphics card (disables the integrated graphics controller) ■ Installing a DVI ADD2 - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 74
allowing tiled memory addressing, deep display buffering, and dynamic data management ■ Provides two serial digital video out (SDVO) channels for use by an appropriate ADD2 accessory card (SFF and CMT form factors only) ■ Drives a DVI monitor directly (USDT form factor only) 6-2 www.hp.com - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 75
Hz refresh (QVGA) ■ 3D engine supporting Z-bias and up to 1600 x 1200 w/32-bit color @ 85 hz refresh The IGC uses a portion of system memory for instructions, textures, and frame (display) buffering. Using a process called Dynamic Video Memory Technology (DVMT), the controller dynamically allocates - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 76
Integrated Graphics Subsystem The Microsoft Direct Diagnostic tool included in most versions of Windows may be used to check the amount of video memory being used. The Display tab of the utility the "Approx. Total Memory" label will indicate the amount of video memory. The value will vary according - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 77
or a low-profile PCIe x16 graphics card. Depending on accessory, upgrading through the PCI Express x16 slot can provide digital monitor support and/or dual-monitor support allowing display-cloning or extended desktop functionality. Software drivers may need to be downloaded for specific cards. ✎ Two - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 78
Graphics Subsystem 6.5 Monitor Connectors All form factors provide an analog VGA connector. The USDT system also includes a DVI-D connector for attaching a digital monitor. 6.5.1 Analog Monitor Connector These systems includes a standard VGA connector (Figure 6-2) for attaching an analog video - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 79
Integrated Graphics Subsystem 6.5.2 Digital Monitor Connector The USDT system includes a DVI-D connector for attaching a digital video monitor. Figure 6-3. DVI-D Digital Monitor Connector, (as 3 Shield 23 TMDS Clock + 12 TMDS Data 3- 24 TMDS Clock - Technical Reference Guide www.hp.com 6-7 - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 80
Integrated Graphics Subsystem 6-8 www.hp.com Technical Reference Guide - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 81
distribution. The USDT form factor uses an external ("brick") supply while the SFF and CMT form factors use a power supply unit contained within the system chassis. The subassemblies are not interchangeable between the three form factors. 7.2.1 USDT Power Distribution The USDT form factor uses an - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 82
the transient period. 7.2.2 SFF Power Distribution The SFF form factor uses a power supply unit internal to the system chassis. Figure 7-2 shows the block diagram for power generation in the SFF. Front Bezel Power Button Power On System Board CPU, slots, Chipsets, Logic, & Voltage Regulators - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 83
ground) sns = sense GND = Power ground RS = Remote sense FC = Fan command FO = Fan off FSpd = Fan speed FS = Fan Sink POK = Power OK (power good) VccP = +12 for CPU [1] This row represents pins 13-24 of connector P1 Figure 7-3. SFF Power Cable Diagram Technical Reference Guide www.hp.com 7-3 - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 84
and Signal Distribution 7.2.3 CMT Power Distribution The CMT form factor uses a power supply unit internal to the system chassis. Figure 7-4 shows the block diagram for power generation in the CMT. Front Bezel Power Button Power On System Board CPU, slots, Chipsets, Logic, & Voltage Regulators - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 85
SFF and CMT systems is Energy Star 3.0-compliant. An Energy Star 4.0 (80 Plus-compliant) power supply unit is used for the SFF and CMT form factors in select configurations. The standard USDT power supply unit is compliant with the Energy Star 4.0 specification. Technical Reference Guide www.hp - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 86
Four Seconds Before Release: If the button is held in for at least four seconds and then released, PS On is negated, de-activating the power supply. 7-6 www.hp.com Technical Reference Guide - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 87
@ 1 Hz [1] Power failure (power supply is overloaded). Check storage devices, expansion cards and/or system board (CPU power connector P3). Blinks red 5 times @ 1 Hz [1] Pre-video memory error. Incompatible or incorrectly seated DIMM. Blinks red 6 times @ 1 Hz [1] Pre-video graphics error. On - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 88
wake the system up from sleep mode through the assertion of the PME- signal on the PCI bus. Refer to Chapter 5, "Network Support" for more information. Modem Ring A ring condition on a serial port can be detected by the power control logic and, if so configured, cause the PS On signal to be asserted - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 89
management functions designed to conserve energy. These functions are provided by a combination of hardware, firmware (BIOS) and software. The system provides the following power management support: ■ ACPI v2.0 compliant (ACPI modes C1, S1, and S3-S5, ) ■ APM 1.2 compliant ■ U.S. EPA Energy Star - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 90
(graphics) connector Parallel port, DB-25 connector Stacked keyboard, mouse PS/2 connectors VGA monitor DB-15 connector Stacked audio line-in, headphone/line-out 1/8" jacks DC input Power supply connector Vccp (PWRCPU) header Control panel (power button, power LED) header Internal speaker header CPU - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 91
Designations Clear CMOS switch Memory slot (black) Memory slot (white) Memory slot (white) Memory slot (white) Processor socket Battery socket Figure 7-6 shows pinouts of headers used on the sytem boards. SFF & CMT only SFF & CMT only Power Button/LED, HD LED Header P5 (USDT, SFF) HD LED + 1 HD - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 92
Power and Signal Distribution 7-12 www.hp.com Technical Reference Guide - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 93
such functions as Power-On Self Test (POST), PCI device initialization, Plug 'n Play support, power management activities, and the Setup utility. The firmware contained in the system BIOS ROM supports the following operating systems and specifications: ■ DOS 6.2 ■ Windows 2000, XP, and Vista (Home - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 94
system BIOS firmware is contained in a flash ROM device that can be re-written with new BIOS code using a flash utility locally (with F10 setup), with the HPQFlash program in a Windows environment, or with the FLASHBIN.EXE utility in a DOS or DOS-like environment. 8.2.1 Upgrading Upgrading the BIOS - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 95
8.3 Boot Functions The BIOS supports various functions related to the boot process, including those that occur during the Power On Self-Test (POST) Memory Detection and Configuration This system uses the Serial Presence Detect (SPD) method of determining the installed DIMM configuration. The BIOS - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 96
not installed. Install or reseat CPU. None Power failure (power supply is overloaded). Check storage devices, expansion cards and/or system board (CPU power connector P3). 5 beeps Pre-video memory error. Incompatible or incorrectly seated DIMM. 6 beeps Pre-video graphics error. On system with - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 97
BIOS functions supported by the systems covered in this guide. These functions, designed to support intelligent manageability applications, are HP E819h Get chassis serial number Real, 16-, & 32-bit Prot. E820h [1] Get system memory map Real E81Ah Write chassis serial number Real E81Bh Get - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 98
System (Form Factor) Subsystem System ID Device ID USDT 0AA4h 281Ah SFF 0AA8h 2818h CMT: 0AACh 2819h NOTE: For all systems, BIOS ROM Family Critical condition. 8.4.3 Drive Fault Prediction The BIOS directly supports Drive Fault Prediction for IDE (ATA)- hp.com Technical Reference Guide - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 99
Chassis Processor Information Cache Information Port Connector Information System Slots BIOS Language Information System Event Log Information Physical Memory Array Memory Devices Memory Array Mapped Addresses Memory Device Mapped Addresses Boot Integrity Service Entry Point System Boot Information - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 100
of a USB keyboard though BIOS function INT 16 is not supported. 8.7 Management Engine Functions The management engine function of Intel AMT allows a system unit to be managed remotely over a network, where or not the system is powered up or not1. The system BIOS can request the management engine - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 101
Mode 4-7 A Advanced Digital Display (ADD2) 6-2 AMT 2-2 APIC Mode 4-7 Audio codec 2-8 Audio Specifications 5-14 B BIOS upgrading 8-2 boot device order 8-3 Boot error codes8-5 C chipset 2-7 CMOS 4-9 CMOS, clearing 4-9 configuration memory 4-9 D Direct Memory Access (DMA) 4-8 Diskette Drive Connector - Compaq dc7800 | Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 102
, processor 2-2 system ID 8-16 T Temperature Status 8-16 U Universal Serial Bus (USB) interface 5-11 upgrading BIOS 8-2 upgrading graphics 6-5 USB 5-22 V VGA connector 6-6 W Web sites Adobe Systems, Inc. 1-1 HP 1-1 Intel Corporation 1-1 Standard Microsystems Corporation 1-1 USB user group 1-1 Index
Technical Reference Guide
HP Compaq dc7800 Series
Business Desktop Computers
Document Part Number: 461444-001
October 2007
This document provides information on the design, architecture, function,
and capabilities of the HP Compaq dc7800 Series Business Desktop
Computers. This information may be used by engineers, technicians,
administrators, or anyone needing detailed information on the products
covered.