Page 1: Technical Reference
Technical Reference Guide For the Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors...
Page 2 This hardcopy is designed to be placed into a standard 3-ring binder. Provided below is a title block that can be copied and cut out and placed into the slip or taped onto the edge of the binder. Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors TRG...
Page 3 Reader Feedback Please feel free to send any questions, suggestions, corrections, or comments regarding this document please to the following email address: Desktop.training.feedback@Compaq.com When responding, please state the title of the referenced document.
Page 4 ENSURE THAT DEVICES DESIGNED TO BE USED WITH COMPAQ PRODUCTS COMPLY WITH FCC CLASS B EMISSIONS REQUIREMENTS. This guide contains information protected by copyright. No part of this document may be photocopied or reproduced in any form without prior written consent from Compaq Computer Corporation. 1998 Compaq Computer Corporation All rights reserved.
Page 5 Technical Reference Guide Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition–- September1998...
Page 6: Table Of Contents
PROCESSOR/MEMORY SUBSYSTEM ... 3-2 3.2.1 PROCESSOR ... 3-3 3.2.2 PROCESSOR CHANGING/UPGRADING... 3-5 3.2.3 SYSTEM MEMORY... 3-6 3.2.4 SUBSYSTEM CONFIGURATION... 3-9 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide...
Page 7 DISKETTE DRIVE PROGRAMMING ... 5-10 5.3.2 DISKETTE DRIVE CONNECTOR... 5-13 SERIAL INTERFACES ... 5-14 5.4.1 RS-232 INTERFACE ... 5-14 5.4.2 SERIAL INTERFACE PROGRAMMING ... 5-15 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition–- September1998...
Page 8 INTRODUCTION... 8-1 BOOT/RESET FUNCTIONS ... 8-2 8.2.1 BOOT BLOCK... 8-2 8.2.2 QUICKBOOT... 8-2 8.2.3 SILENTBOOT ... 8-2 8.2.4 RESET ... 8-2 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide...
Page 9 CEMM PRIVILEDGED OPS ERROR MESSAGES... A-12 A.21 CEMM EXCEPTION ERROR MESSAGES ... A-12 APPENDIX B ASCII CHARACTER SET ... INTRODUCTION...B-1 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors ) ... A-3 )... A-4 ) ... A-4 ) ...
Page 10 KEYBOARD LAYOUTS ...C-4 C.2.3 KEYS...C-6 C.2.4 KEYBOARD COMMANDS...C-9 C.2.5 SCAN CODES ...C-9 APPENDIX D COMPAQ 10/100 TX PCI INTEL WOL UTP CONTROLLER CARD... INTRODUCTION... D-1 FUNCTIONAL DESCRIPTION... D-2 D.2.1 STATUS INDICATORS... D-2 D.2.2 CARD POWER AND CLOCK ... D-3 D.2.3 82558 CONTROLLER ...
Page 11: List Of Figures
UPPLY 7–4. S IGURE IGNAL ISTRIBUTION 7–5. B IGURE ACKPLANE EADER viii Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors LIST OF FIGURES ERSONAL OMPUTER WITH ONITOR ... 2-4 ... 2-5 ... 2-6 ... 2-7 AYOUT ...
Page 12 NTERNAL RCHITECTURE , (F DB-15, EMALE AS VIEWED FROM REAR P1) ... F-8 EADER Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide ...C-3 IAGRAM ...C-5 ...C-5 ... D-2...
Page 13: List Of Tables
5–7. ABLE ISKETTE RIVE ONTROLLER 5–8. 34-P ABLE ISKETTE RIVE Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors LIST OF TABLES ... 1-3 ... 2-14 OMPARISON ... 2-15 ... 2-15 ... 2-15 ... 2-16 ... 2-16 PECIFICATIONS ...
Page 14 ESSAGES ... A-12 RROR ESSAGES ... A-12 RROR ESSAGES ...B-1 ...C-9 OMMANDS ...C-10 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide ... 5-29 ... 6-9 APPING ... 6-10...
Page 15 F–5. M ABLE ONITOR OWER ANAGEMENT F–6. DB-15 M ABLE ONITOR ONNECTOR F–7. M ABLE ULTIMEDIA NTERFACE Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors ... D-5 ONTROL EGISTER APPING ...E-3 PECIFICATIONS YPICAL ONFIGURATION ...E-5 ...E-6 INOUT /SGRAM)...
Page 16: Chapter 1 Introduction
1. Chapter 1 INTRODUCTION ABOUT THIS GUIDE This guide provides technical information about the Compaq Deskpro EN Series of Personal Computers in desktop and minitower form factors. This document includes information regarding system design, function, and features that can be used by programmers, engineers, technicians, and system administrators.
Page 17: Notational Conventions
(MSb) of a byte. Bytes, words, double words, and quad words are typically shown with most-significant portions on the left or top and the least- significant portions on the right or bottom respectively. Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Index port Data port Third Edition –...
Page 18: Common Acronyms And Abbreviations
DOS compatibility hole Display Data Channel direction flag Table 1-1. Acronyms and Abbreviations Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide Continued...
Page 19 Joint Electron Device Engineering Council Kb / KB kilobits / kilobytes (x 1024 bits / x 1024 bytes) Kb/s kilobits per second kilogram kilohertz kilovolt Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition – September 1998 Continued...
Page 20 (monitor input) Relative humidity root mean square read-only memory revolutions per minute real time clock read/write Third Edition - September 1998 Technical Reference Guide Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Continued...
Page 21 VLSI very large scale integration VRAM Video RAM watt Wake on LAN WRAM Windows RAM zero flag zero insertion force (socket) Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition – September 1998...
Page 22: Chapter 2 System Overview
Chapter 2 SYSTEM OVERVIEW INTRODUCTION The Compaq Deskpro EN Series of desktop and minitower Personal Computers (Figure 2-1) delivers an outstanding combination of manageability, serviceability, and consistency for enterprise environments. Based on Intel Pentium II and Celeron processors, the Deskpro EN Series emphasizes performance and industry compatibility.
Page 23: Features And Options
The following standard features are included on all models: Pentium II or Celeron processor High-performance 2D/3D AGP graphics card Embedded 16-bit full-duplex audio with Compaq Premier Sound 3.5 inch, 1.44-MB diskette drive Extended IDE controller support for up to four IDE drives...
Page 24: Options
Graphics cards/memory: ATI RAGE PRO Turbo AGP card Compaq Deskpro Computers are easily upgraded and enhanced with peripheral devices designed to meet PCI and ISA standards. The Compaq Deskpro Personal Computers are compatible with peripherals designed for Plug ’n Play operation.
Page 25: Mechanical Design
Chapter 2 System Overview MECHANICAL DESIGN The Compaq Deskpro EN Series uses a desktop form factor. This section illustrates the mechanical particulars of the bezel, chassis, and major board assemblies. 2.3.1 CABINET LAYOUTS Desktop Item Figure 2–2. Cabinet Layouts, Front View...
Page 26: Figure 2-3. Cabinet Layouts , R
Parallel Interface Connector Serial Interface Connector (COM1) Serial Interface Connector (COM2) Graphics Monitor Connector Figure 2–3. Cabinet Layouts, Rear View Third Edition - September 1998 Technical Reference Guide Minitower Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors...
Page 27: Chassis Layouts
AGP NLX Graphics Card Wide-Ultra SCSI Card System Board Speaker Figure 2–4. Desktop Chassis Layout, Top View Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Back Expansion Card Cage Chassis Fan Processor Front Third Edition – September 1998...
Page 28: Figure 2-5. Minitower Chassis
AGP NLX Graphics Card Figure 2–5. Minitower Chassis Layout, Left Side View Third Edition - September 1998 Technical Reference Guide Power Supply Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Drive Bays Expansion Card Cage Front Processor...
Page 29: Board Layouts
Later production units use the 008123-xxx board. [2] PCA # 008123 [3] PCA # 007998 Figure 2–6. System Board Connector and Switch Locations Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors System Board (NLX-Type) (P/N 007998-xxx...
Page 30 Power button/LED header P5 Fan header P8 Speaker header P6 SCSI LED header P29 NIC WOL header P9 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide Power Supply Side...
Page 31: System Architecture
Chapter 2 System Overview SYSTEM ARCHITECTURE The Compaq Deskpro EN Series of Personal Computers is based on an Intel Pentium II processor matched with the Intel 440BX AGPset. The basic architecture (Figure 2-8), uses three main buses: the Host bus, the Peripheral Component Interconnect (PCI) bus, and the Industry Standard Architecture (ISA) bus.
Page 32 Mouse I/F CDS Desktops and all Minitower models. 3200 and 6400 models only. 4300 and 9100 models only. Figure 2–8. Compaq Deskpro EN System Architecture, Block diagram Third Edition - September 1998 Technical Reference Guide 66-/100- MHz 64-Bit Host Bus...
Page 33: Processor
2.4.1 PROCESSOR The Deskpro EN Series includes models based on Pentium II and Celeron processors. The processor and heat sink is mounted as an assembly (Figure 2-9) in a slot (Slot 1) on the system board. The Pentium II processor includes a microprocessor and a secondary (L2) cache contained in a single edge connector (SEC) cartridge to which a heat sink is attached.
Page 34: System Memory
Table 2-2. Support Chipsets Component Type 82443BX 82371 87307 CY2280 Compaq ASIC Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide Function Memory Controller Host/PCI Bridge PCI/ISA Bridge EIDE Controller...
Page 35: Serial And Parallel Interfaces
2.4.8 AUDIO SUBSYSTEM All models feature the Compaq Premier Sound system. The system board includes an embedded 16-bit full-duplex subsystem based on the ES1869 graphics controller. The audio output is processed through a six-level equalizer designed to work with the chassis acoustics. A low- distortion 5-watt amplifier drives a long-excursion speaker for optimum sound.
Page 36: Specifications
SPECIFICATIONS This section includes the environmental, electrical, and physical specifications for the Compaq DESKPRO EN Series Personal Computers. Table 2–4. Environmental Specifications Parameter Air Temperature Shock Vibration 0.000215g^ 2/hz, 10-300 Hz [1] Humidity 90% RH @ 36 Maximum Altitude NOTE: Values are subject to change without notice.
Page 37 Average Access Time: Random Full Stroke Audio Output Level Cache Buffer 2-16 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Table 2-7. Measurement 3.5 in 1.44 MB/720 KB diskette 1/3 bay (1 in) 3 ms/6 ms...
Page 38 17.0 ms 20.0 ms 8420 13325 165-264 512 KB 256 KB SMART II SMART II Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors 9.1 GB (# 179288-001) Wide-Ultra SCSI 5.25 in 40.0 MB/s .76 ms 7.5 ms 15.0 ms...
Page 39 Chapter 2 System Overview 2-18 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors This page is intentionally blank. Third Edition – September 1998...
Page 40: Chapter 3 Processor/Memory Subsystem
Chapter 3 PROCESSOR/MEMORY SUBSYSTEM INTRODUCTION This chapter describes the processor/cache memory subsystem of the Compaq Deskpro EN Series of desktop and minitower Personal Computers. These systems are shipped either with an Intel Pentium II or Celeron processor and either 32 or 64 megabytes of system memory, depending on configuration.
Page 41: Figure 3-1. Processor /Memory
64-bit memory data bus. The 443BX supports SDRAM, EDO, FPM, and ECC DIMM modules. Three DIMM sockets allow the system memory to be expanded to 384 megabytes. Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Cntl 66-/100-MHz Mem.
Page 42: Figure 3-2. Pentium Ii Processor
32-KB 512-KB Cache Cache Branch Host bus speed ½ Core processing speed Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide Pentium II Pentium II 350 MHz 400 MHz...
Page 43: Figure 3-3. Celeron Processor
Pentium MMX, Pentium, and x86 processors. NOTE: Later versions of the Celeron processor require updated BIOS firmware. Refer to section 3.2.2 for upgrading information. Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Celeron Processor 32-KB...
Page 44: Processor Changing/Upgrading
Installing and running one of these processors in a system with BIOS dated earlier than 7/30/98 will likely cause the system to halt (lockup). The BIOS (ROM) version may be checked using either the Compaq Diagnostics or Compaq Insight utility.
Page 45: System Memory
The supported format complies with the JEDEC specification for 128-byte EEPROMs. This system also provides support for 256-byte EEPROMs to include additional Compaq-added features such as part number and serial number. The SPD format as supported in this system is shown in Table 3-3.
Page 46 [7] Field format proposed to JEDEC but not defined as standard at publication time. [8] Field specified as optional by JEDEC but required by this system. [9] Compaq usage. This system requires that the DIMM EEPROM have this space available for reads/writes.
Page 47: Figure 3-4. System Memorym
DRAM or to PCI space. Graphics RAM area is mapped to PCI or AGP locations. Figure 3–4. System Memory Map Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors FFFF FFFFh...
Page 48: Subsystem Configuration
AGP Command B0..B3h AGP Control Aperture Size B8..BBh Aperture Translation Table Aperture I/F Timer Low Priority Timer Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide Reset Value 0000h 0000h...
Page 49 Chapter 3 Processor/Memory Subsystem This page is intentionally blank. 3-10 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998...
Page 50: Chapter 4 System Support
This chapter covers functions provided by off-the-shelf chipsets and therefore describes only basic aspects of these functions as well as information unique to the Compaq Deskpro EN Series of Personal Computers. For detailed information on specific components, refer to the applicable manufacturer’s documentation.
Page 51: Pci Bus Overview
PCI/ISA Bridge Function ISA Bus Minitower only Figure 4–1. PCI Bus Devices and Functions Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors PCI Connector Slot 5 PCI Connector Slot 4 PCI Connector Slot 3 PCI/AGP PCI Connector Slot 2...
Page 52: Pci Connector
+5 VDC +5 VDC ACK64- REQ64- +5 VDC +5 VDC +5 VDC +5 VDC Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide B Signal A Signal Reserved C/BE7-...
Page 53: Pci Bus Master Arbitration
The 82443 and the 82371 support the passive release mechanism, which reduces PCI bus latency caused by an ISA initiator owning the bus for long periods of time. Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Table 4-2.
Page 54: Pci Bus Transactions
01 = Type 1 PCI Configuration Data Register I/O Port 0CFCh, R/W, (8-, 16-, 32-bit access) Function 31..0 Configuration Data. Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide...
Page 55: Figure 4-3. Type 0 Configuration
The function number (CF8h, bits <10..8>) is used to select a particular function within a multifunction device. Configurable functions present in system as shipped from the factory are listed in Table 4-4. Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors 24 23...
Page 56 Technical Reference Guide Device No. Function No. 16 15 Device-Specific Area Min_GNT Interrupt Pin Interrupt Line Latency Timer Cache Line Size Revision ID Command Vender ID Not required Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Register Index...
Page 57: Option Rom Mapping
During POST, the PCI bus is scanned for devices that contain their own specific firmware in ROM. Such option ROM data, if detected, is loaded into system memory’s DOS compatibility area (refer to the system memory map shown in chapter 3). Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Table 4-5.
Page 58: Pci Interrupt Mapping
INTB- INTA- INTD- INTC- INTB- INTA- INTD- INTC- INTB- INTA- Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide PCI Slot 5 AGP Slot INTD- INTA- INTB- INTA- INTC-...
Page 59: Pci Configuration
APIC/BIOS Control PCI Interrupt Routing PCI Interrupt Routing PCI Interrupt Routing NOTE: Assume unmarked locations/gaps as reserved. 4-10 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Table 4-6. PCI/ISA Bridge Configuration Registers (82371, Function 0) Reset PCI Config.
Page 60: Agp Bus Overview
There are two basic types of transactions on the AGP bus: data requests (addressing) and data transfers. These actions are separate from each other. Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998...
Page 61 “000” for low priority and “001” indicating high priority. GNT- TRDY- ST0..2 Figure 4–5. AGP 1X Data Transfer (Peak Transfer Rate: 266 MB/s) 4-12 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998...
Page 62 AD_STBx while D1B is latched by the falling edge of AD_STBx-. AD_STBx AD_STBx- ST0..2 AGP 4X Data Transfer (Peak Transfer Rate: 1064 MB/s) Compaq Deskpro EN Series of Personal Computers Third Edition - September 1998 Technical Reference Guide D3B D4A D4B D3B D4A D4B Desktop and Minitower Form Factors...
Page 63: Agp Configuration
Assume unmarked locations/gaps as reserved. Refer to Intel documentation for detailed register descriptions. The AGP graphics adapter (actually its resident controller) is configured as a standard PCI device. 4-14 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Table 4-7. (82443BX, Function 1) Reset PCI Config.
Page 64: Agp Connector
PAD19 PAD18 PAD17 PAD16 CBE2- FRAME- IRDY- RSVD RSVD RSVD RSVD Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide A Signal B Signal VDD3 VDD3 TRDY- DEVSEL- STOP-...
Page 65: Isa Bus Overview
NOTE: This section describes the ISA bus in general and highlights bus implementation in this particular system. For detailed information regarding ISA bus operation, refer to the Compaq Extended Industry Standard Architecture (EISA) Technical Reference Guide. The industry standard architecture (ISA) bus provides an 8-/16-bit path for standard I/O peripherals as well as for optional devices that can be installed in the ISA expansion slots.
Page 66: Isa Connector
DAK7- SA16 DRQ7 SA15 +5 VDC SA14 GRAB- SA13 SA12 SA11 SA10 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide Signal SBHE- LA23 LA22 LA21 LA20 LA19 LA18...
Page 67: Isa Bus Transactions
Bus Address Latch Enable (BALE) signal is held active for the duration of the operation. As a result, signals LA23..17 are always enabled and must be held stable for the duration of each bus cycle. 4-18 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998...
Page 68 (at 0.5 VDC) or 0.1 ma in the high state (at 3.75 VDC). The logic-high voltage at the bus ranges from 3.75 VDC to 5.5 VDC. The logic low voltage ranges from 0 VDC to 0.8 VDC. Compaq Deskpro EN Series of Personal Computers Third Edition - September 1998 Technical Reference Guide...
Page 69: Direct Memory Access
NOTE: This section describes DMA in general. For detailed information regarding DMA operation, refer to the Compaq Extended Industry Standard Architecture (EISA) Technical Reference Guide. Note, however, that EISA enhancements as described in the referenced document are not supported in this (ISA only) system.
Page 70 16-bit memory and 16-bit peripherals. Table 4-11. Page Register I/O Port 087h 083h 081h 082h 08Bh 089h 08Ah 08Fh [see note] Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide 4-21...
Page 71 Reset Pointer Flip-Flop (Command) Master Reset (Command) Reset Mask Register (Command) NOTE: For a detailed description of the DMA registers, refer to the Compaq EISA Technical Reference Guide . 4-22 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Table 4-12.
Page 72: Interrupts
(lowest number) is processed first. South Bridge Component IRQ1,3..7 Interrupt IRQ9..12, Cntlr. 1 IRQ2 14,15 Interrupt Cntlr. 2 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide INTR Microprocessor 4-23...
Page 73 Initialization Command Word 2-4, Int. Cntlr. 2 The initialization and operation of the interrupt control registers follows standard AT-type protocol. 4-24 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Table 4-13. Source (Typical) Interval timer 1, counter 0...
Page 74 NMI-. Note that the lower six bits of register at I/O port 70h affect RTC operation and should be considered when changing NMI- generation status. Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors...
Page 75 APM BIOS to service the SMI- according to the cause of the timeout. Although the SMI- is primarily used for power managment the interrupt is also employed for the QuickLock/QuickBlank functions as well. 4-26 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998...
Page 76: Interval Timer
Read or write value, counter 2 043h Control Word Interval timer operation follows standard AT-type protocol. For a detailed description of timer registers and operation, refer to the Compaq Extended Industry Standard Architecture Expansion Bus Technical Reference Guide. 4.4.6 ISA CONFIGURATION The working relationship between the PCI and ISA buses requires that certain parameters be configured.
Page 77: System Clock Distribution
South Bridge 32.77 KHz Crystal NOTE: [1] Depending on processor speed (refer to Chapter 3, “Processor/Memory Subsystem”). 4-28 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Table 4-17. Destination Processor, 82443 N. Bridge AGP Slot “...
Page 78: Real-Time Clock And Configuration Memory
Memory Area Year (128 bytes) Month Day of Week Lower Config. Memory Area (114 bytes) RTC Area (14 bytes) CMOS Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide 4-29...
Page 79 3. Replace jumper to original configuration (pins 1 and 2). 4. Re-connect AC power cord to the chassis and turn unit on. 4-30 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Table 4-18. Configuration Memory (CMOS) Map...
Page 80 RTC Power Status 0 = RTC has lost power 1 = RTC has not lost power Compaq Deskpro EN Series of Personal Computers Third Edition - September 1998 Technical Reference Guide Sunday in April, retreat 1 hour on last Sunday in October).
Page 81 1101 = Type 13 0110 = Type 6 1110 = Type 14 0111 = Type 7 1111 = other (use bytes 1Ah) 4-32 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998...
Page 82 Configuration Bytes 17h and 18h, Extended Memory Size Bytes 17h and 18h hold a 16-bit value that specifies the extended memory size in 1-KB increments. Compaq Deskpro EN Series of Personal Computers Third Edition - September 1998 Technical Reference Guide...
Page 83 1 = Not allowed Reserved Diagnostic Status Byte Address 00 = Memory locations 80C00000h-80C00004h 01 = I/O ports 878h-87Ch 11 = neither place 4-34 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998...
Page 84 00000 = None 00001 = 512 KB 00010 = 1 MB 00011 = 1.5 MB 11111 = 15.5 MB Compaq Deskpro EN Series of Personal Computers Third Edition - September 1998 Technical Reference Guide Desktop and Minitower Form Factors 4-35...
Page 85 0 = No screen blank 1 = Screen blank w/QuickLock 4..0 ScreenSave Timeout. (Index to SIT monitor timeout record) 000000 = Disabled 4-36 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998...
Page 86 0 = Not installed, 1 = Installed 3..0 Reserved Configuration Byte 34h, International Language Support Default Value = 00h Compaq Deskpro EN Series of Personal Computers Third Edition - September 1998 Technical Reference Guide Desktop and Minitower Form Factors 4-37...
Page 87 These four bytes record the time at which the hood of the system was removed: Byte 41h, month & day Byte 42h, year and month Byte 43h, minutes and seconds Byte 44h, removal flag and minutes 4-38 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998...
Page 88 ECC Status for DIMM 3 ECC Status for DIMM 2 ECC Status for DIMM 1 ECC Status for DIMM 0 3..0 Reserved Compaq Deskpro EN Series of Personal Computers Third Edition - September 1998 Technical Reference Guide Desktop and Minitower Form Factors 4-39...
Page 89 This byte holds the value of the amount of extended system memory that tested good during POST. The amount is given in 64-KB increments. 4-40 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998...
Page 90 These bytes hold the APM timer values: Byte 8Ah, minutes Byte 8Bh, hours Byte 8Ch, day Byte 8Dh, month Byte 8Eh, year Byte 8Fh, century Compaq Deskpro EN Series of Personal Computers Third Edition - September 1998 Technical Reference Guide Desktop and Minitower Form Factors 4-41...
Page 91 The ISA card uses the RAMDAC on the PCI card The palette snooping feature (sometimes called “RAMDAC shadowing”) on the PCI card is enabled and functioning properly. 4-42 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998...
Page 92 1 = Enable Secondary Hard Drive Controller IRQ 00 = IRQ10 01 = IRQ11 10 = IRQ12 11 = IRQ15 Reserved Compaq Deskpro EN Series of Personal Computers Third Edition - September 1998 Technical Reference Guide Desktop and Minitower Form Factors 4-43...
Page 93 F respectively. The mapping for each drive is as follows: Drive 65 (C) Drive 66 (D) 4-44 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Drive 68 (E) Drive 15 (F) Third Edition - September 1998 Function No.
Page 94 Configuration Bytes CAh, DBh; Chassis Serial Number Configuration Bytes DEh, DFh; Checksum of Locations 90h-DDh Configuration Bytes E0h-FFh; Client Management Error Log Compaq Deskpro EN Series of Personal Computers Third Edition - September 1998 Technical Reference Guide Desktop and Minitower Form Factors...
Page 95: I/O Map And Register Accessing
PCI Configuration Data (byte, word, or dword access) FF00..FF07h IDE Bus Master Register NOTE: Assume unmarked gaps are reserved/unused. 4-46 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Table 4-19. System I/O Map Third Edition - September 1998...
Page 96: Gpio Utilization
Processor thermal caution status: 0 = not occurred, 1 = occurred. GPI #21 Themal sensor: 0 = diode connected, 1 = diode not connected. Table 4-20. Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide...
Page 97 GPO #26 Not used. GPO #27 Chassis fan control. When cleared (0) shuts down the chassis fan. GPO #28-30 Not used. 4-48 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Table 4-21. Third Edition - September 1998...
Page 98 07h and writing the desired offset to the index register. The data is then either written to or read from the data register. Table 4-22. Reset Value Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide...
Page 99 Read 0, no ring received Write 1, ring detected 2..0 GPIO22..20 Not Available GPIO Port 2 Direction/Output Type/PU Cntrl., I/O Addr. 07D-07Fh, (87307 I/O Controller) 4-50 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998...
Page 100: System Management Support
Super I/O Write Block 2 Super I/O Write Block 3 The following subsections describe the system management functions. Any BIOS interaction required of these functions is described in Chapter 8, “BIOS” or in the Compaq BIOS Technical Reference Guide. Table 4-23.
Page 101: Flash Rom Write Protect
Box* logic. Black Box logic acting as the sentry for the administrator password by preventing inadvertent or unauthorized writing to the Flash ROM. Black Box logic is Compaq-proprietary and controlled exclusively through the BIOS ROM. 4-52 Compaq Deskpro EN Series of Personal Computers...
Page 102: I/O Security
In addition, the configuration registers of the 87307 are further protected by Client Management (CM) logic (contained within a Compaq ASIC) that can be set (using BIOS call INT 15 AX=E829h) to block access to the 87307 configuration registers of the following...
Page 103: Temperature Sensing
P15, is part of sensing logic that provides input to a Compaq ASIC. The sensing logic is set to trip when 179.6 F (82 C) is reached. At that time the Compaq ASIC can generate an SMI (if so configured, see registers below) resulting in a warning to the user and/or the chassis fan being turned on.
Page 104: Smart Cover Lock
The locking mechanism consists of a solenoid controlled by the Setup utility through the Client Management logic in a Compaq ASIC. The presence of the Smart Cover Lock (actually of the solenoid) is detected by logic and readable by software at 87307 GPIO port 1 bit <6>.
Page 105: Power Management
In ACPI mode the power supply, when on, will turn off only after the button is pressed and held for over four seconds. The power button mode is controlled by ROM-based Setup through a Compaq ASIC. A detailed description of system power control is provided in Chapter 7 “Power and Signal Distribution.”...
Page 106: Monitor Power Control
This capability is dependent on the graphics controller employed in the system. For compliance to the monitor power control feature refer to the applicable appendix of the installed graphics controller card. Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998...
Page 107 Chapter 4 System Support This page is intentionally blank. 4-58 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998...
Page 108: Chapter 5 Input/Output Interfaces
The IDE interface is configured as a PCI device and controlled through standard I/O mapped registers. page 5-1 page 5-9 page 5-14 page 5-20 page 5-27 page 5-34 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide...
Page 109 Bus Master IDE Status (Primary) Bus Master IDE Descriptor Ptr (Pri.) Bus Master IDE Command (Secondary) Bus Master IDE Status (Secondary) Bus Master IDE Descriptor Ptr (Sec.) 5-2 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Table 5-1. Value Conf.
Page 110 Error bit is set in the Status register Hard drive controller has completed execution of its internal diagnostics Table 5-3. Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide...
Page 111 1F5h (bits <2..0>) while the remaining bits are held in location 1F4h. 5-4 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition – September 1998...
Page 112 The alternate Status register at location 3F6h holds the same status data as location 1F7h but does not clear hardware conditions when read. Third Edition - September 1998 Technical Reference Guide Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors...
Page 113 Alternate Status Register, I/O Port 3F6h/376h (Read Only) The alternate Status register at location 3F6h holds the same status data as location 1F7h but does not clear hardware conditions when read. 5-6 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Value...
Page 114 1111 = 0 Drive Select: 00 = Disabled 01 = Drive 1 selected 10 = Drive 0 selected 11 = Invalid Third Edition - September 1998 Technical Reference Guide Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors...
Page 115: Ide Connector
[1] Primary connector wired to IRQ14, secondary connector wired to IRQ15. [2] Pin 39 is used for spindle sync and drive activity (becomes SPSYNC/DACT-) when synchronous drives are connected. 5-8 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Table 5-5.
Page 116: Diskette Drive Interface
Result phase, in which case the Execution phase can be followed by a Command phase. During periods of inactivity, the diskette drive controller is in a non-operation mode known as the Idle phase. Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998...
Page 117: Diskette Drive Programming
Base Address MSB Base Address LSB Interrupt Select Interrupt Type DMA Channel Select Report DMA Assignment Configuration Data Drive ID 5-10 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Table 5-6. Reset Value Third Edition – September 1998...
Page 118 Drive Select 00 = Drive 1 01 = Drive 2 10 = Reserved 11 = Tape drive Table 5-7. Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide 5-11...
Page 119 00 = 500 Kb/s 01 = 300 Kb/s 10 = 250 Kb/s 11 = 1 or 2 Mb/s (depending on TUP reg. Bit <1>) 5-12 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition – September 1998...
Page 120: Diskette Drive Connector
WR DATA- WR ENABLE- TRK 00- WR PRTK- RD DATA- SIDE SEL- DSK CHG- Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide Description Drive head direction control Ground...
Page 121: Serial Interfaces
Receive Data TX Data Transmit Data Data Terminal Ready Ground Each DB-9 port is independently configurable as to it’s COMn (address) designation. 5-14 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors 87307 DB-9 A (RS-232) TX/RX/CNTRL UART1 (Log.
Page 122: Serial Interface Programming
00h / 00h 02h / 03h F8h / F8h 03h / 04h 03h / 03h 04h / 04h 04h / 04h Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide 5-15...
Page 123: Table 5-11. Serial Interface
Receive Buffer / Transmit Holding Register, I/O Port 3F8h/2F8h When read by the CPU, this byte contains receive data. When written to by the CPU, the byte contains data to be transmitted. 5-16 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Table 5-11.
Page 124 111 = Reserved Interrupt Pending (if cleared) Third Edition - September 1998 Technical Reference Guide Baud Rate Decimal Divisor 2400 3600 4800 7200 9600 19200 38400 57600 115200 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors 5-17...
Page 125 Serial Interface Interrupts Enabled (if set) Reserved RTS Signal Active (if set) DTR Signal Active (if set) 5-18 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors 1 = Enable TX/RX FIFOs Third Edition – September 1998...
Page 126 CTS- Has Changed State Since Last Read Scratch Pad Register, I/O Port 3FFh/2FFh This register is not used in this system. Third Edition - September 1998 Technical Reference Guide Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors 5-19...
Page 127: Parallel Interface
The SPP mode uses three registers for operation: the Data register (DTR), the Status register (STR) and the Control register (CTR). Address decoding in SPP mode includes address lines A0 and A1. 5-20 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition – September 1998...
Page 128: Enhanced Parallel Port Mode
DMA and RLE are inhibited. NOTE: The 87307 does not support ECP v1.7 submode of ECP mode 4. Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998...
Page 129: Parallel Interface Programming
Base Address MSB Base Address LSB Interrupt Select Interrupt Type DMA Channel Select Report DMA Assignment Configuration Data 5-22 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Table 5-12. Reset Value Third Edition – September 1998...
Page 130: Table 5-13. Parallel Interface
Base + 400h Base + 400h Base + 400h Base + 400h Base + 401h Base + 402h Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide EPP Mode ECP Mode...
Page 131 These registers are used for reading/writing data. Port 0 is used for all transfers. Ports 1-3 are used for transferring the additional bytes of 16- or 32-bit transfers through port 0. 5-24 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors...
Page 132 1 = Full FIFO Empty Status (Read Only) 0 = Not empty (contains at least 1 byte) 1 = Empty Third Edition - September 1998 Technical Reference Guide Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors 5-25...
Page 133: Parallel Interface Connector
Data 5 Data 6 Data 7 ACK- Acknowledge Busy Paper End SLCT Select 5-26 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Table 5-14. DB-25 Parallel Connector Pinout Signal ERR- INIT- SLCTIN- Third Edition – September 1998...
Page 134: Keyboard/Pointing Device Interface
25 us 45 us 0 us 25 us 8 us 20 us 15 us 25 us Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide Parity Stop (MSb) 5-27...
Page 135 Set Type Key - Make/Brake Set Type Key - Make Resend Reset Note: [1] Used in Mode 3 only. 5-28 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Table 5-15. 8042-To-Keyboard Commands Value Description Enables LED indicators. Value EDh is followed by an option byte that specifies the indicator as follows: Bits <7..3>...
Page 136: Pointing Device Interface Operation
00h / na 00h / na 01h / 0Ch 01h / 01h 04h / 04h 04h / 04h -- / na Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide 5-29...
Page 137 A CPU write to I/O port 64h places a command value into the input buffer and sets the CMD/DATA bit of the status register (bit <3>) to CMD. 5-30 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors...
Page 138 Disable keyboard command (sets bit <4> of the 8042 command byte). Enable keyboard command (clears bit <4> of the 8042 command byte). Third Edition - September 1998 Technical Reference Guide Table 5-17. Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Continued 5-31...
Page 139 Pulse output port. Controls the pulsing of bits <3..0> of the output port (0 = pulse, 1 = don’t pulse). Note that pulsing bit <0> will reset the system. 5-32 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors...
Page 140: Keyboard/Pointing Device Interface Connector
Keyboard/Pointing Device Connector Pinout Signal Description DATA Data Not Connected Ground Table 5-18. Signal + 5 VDC Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide Description Power Clock Not Connected 5-33...
Page 141: Universal Serial Bus Interface
Sub Class Code Base Class Code NOTES: Assume unmarked locations/gaps as reserved. Refer to applicable Intel documentation for detailed descriptions of registers. 5-34 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Table 5-19. USB Interface Configuration Registers Reset PCI Config.
Page 142: Usb Control
Description +5 VDC USB- Data (minus) Table 5-20. Table 5-21. USB Connector Pinout Signal USB+ Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide Description Data (plus) Ground 5-35...
Page 143 Chapter 5 Input/Output Interfaces This page is intentionally blank. 5-36 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition – September 1998...
Page 144: Chapter 6 Audio Subsystem
6. Chapter 6 Audio Subsystem INTRODUCTION This chapter describes the audio subsystem, which features Compaq Premier Sound. The audio subsystem is compatible with software written for industry-standard sound subsystems. The audio subsystem can capture and playback .WAV files (as used in most Windows applications). Support for FM synthesis for playback of MIDI (.MID) files is also included.
Page 145: Functional Description
Using this connector defeats (mutes) the internal speaker and Line Out signals. Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998...
Page 146: Figure 6-1. Audio Subsystem
North Bridge Figure 6–1. Audio Subsystem Block Diagram (L/R) Equalizer Circuit (L+R) Mute (L/R) (L/R) Splitter (L/R) ISA Bus Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition–- September1998 Technical Reference Guide Headphones Power Mute Line...
Page 147: Pcm Audio Processing
Each sample is quantized into a digital code that specifies the voltage level of the analog signal at that particular time. The quantizing format options are as follows: Mono or stereo 8- or 16-bit Signed or unsigned Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Quantized Values 8-Bit Third Edition - September 1998...
Page 148 ESPCM is a proprietary format that offers greater performance. B. Discrete Level Waveform C. Final Analog Output Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition–- September1998 Technical Reference Guide...
Page 149: Figure 6-4. Audio Subsystem
Right 16-bit Mono Mono Hi 16-bit Stereo Left Hi Figure 6–4. Audio Subsystem-to-ISA Bus PCM Audio Data Formats / Byte Ordering Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Table 6-1. Audio Mode Differences Compatibility Mode...
Page 150: Fm Synthesis Audio Processing
Data 7..0 Figure 6–6. Audio Car-to-ISA Bus FM Audio Data Format Modulating Signal Carrier Oscillator Frequency Cntrl Address Data Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition–- September1998 Technical Reference Guide FM Signal Address Data...
Page 151: Programming
DMA channels. Typically, dual DMA operation would use DMA channel 1 for capture (recording) and DMA channel 0 or 3 for playback. Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors...
Page 152: Control
3n0, 3n1h MPU-401 Port 388-38Bh FM Synthesizer (alias of 2n0-2n3h) Table 6-3. Index Function Master Volume FM Volume CD Volume Line Volume Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition–- September1998 Technical Reference Guide...
Page 153: Table 6-4. Extended Modea
Wave Select NOTE: Refer to OEM’s ES1869 data sheet for detailed registers descriptions. Abbreviations: AM Amplitude Modulation (tremolo) Vib Vibrato 6-10 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Table 6-4. Index Function 60, 62h Master Volume (Left, Right) Master Volume Control Volume Int.
Page 154: Specifications
5 watts into 8 ohms 10 % 26 db 0 - 22.5 db -46.5 - +10 db 450 - 4000 Hz Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition–- September1998 Technical Reference Guide 6-11...
Page 155 Chapter 6 Audio Subsystem 6-12 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors This page is intentionally blank. Third Edition - September 1998...
Page 156: Chapter 7 Power Supply And Distribution
7. Chapter 7 POWER SUPPLY AND DISTRIBUTION INTRODUCTION This chapter describes the power supply and method of general power and signal distribution in the Compaq Deskpro INDY Personal Computer. Topics covered in this chapter include: Power supply assembly/control (7.2) Power distribution (7.3) Signal distribution (7.4)
Page 157: Power Supply Assembly
(suspend) states. The power supply can override the Fan Off signal if the temperature in the power supply assembly is too high. Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Table 7-1.
Page 158: Power Control
Condition Normal full-on operation Sleep (suspend) state Thermal condition: processor has overheated and shut down Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide...
Page 159: Wake Up Events
PS On signal. Note that the PCI card must have a second source of power to operate during the system unit’s sleep state. Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors...
Page 160: Power Distribution
Board Pin 4 Pin 5 Pin 6 Pin 7 PS On RSRTN Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide 4 3 2 P3-P5 P1 (ATX-type) 16 17...
Page 161: Low Voltage Distribution
2.8 VDC 00011 11000 2.7 VDC 00100 11001 2.6 VDC 00101 11010 2.5 VDC 00110 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors LM317 +5 AUX Regulator Circuit LM317 +5 VDC Regulator Circuit +3.3 VDC Regulator VTT (+1.5 VDC)
Page 162: Signal Distribution
AGP Bus Graphics Card Keyboard Mouse 3200 and 6400 models 4300 and 9100 models Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide Pwr On 10/100 HD Activity Card...
Page 163: Figure 7-5. Backplane Header
NOTE: No polarity consideration required for cable connection to header P6 (speaker) or P29 (SCSI HD LED). Figure 7–5. Backplane Header Pinouts Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Pins Function Cover Lock & 12 VDC Cover Unlock &...
Page 164: Chapter 8 Bios Rom
For detailed information regarding the BIOS, refer to the Compaq Basic Input/Output System Technical Reference Guide. page 8-2 page 8-3 page 8-4 page 8-19 page 8-21 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide...
Page 165: Boot/Reset Functions
82371 to create a hard reset by asserting CPURST#, PCIRST#, and RSTDRV for at least 1 ms. After the reset the 82371 automatically clears bit <2> of 0CF9h. Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors...
Page 166: Memory Detection And Configuration
5. Memory Timing – For SDRAM, the memory controller requires the RAS pre-charge time and the RAS-to-CAS delay time. SPD bytes checked: 27and 29. Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998...
Page 167: Desktop Management Support
The BIOS32 Service Directory is a 16-byte block that begins on a 16-byte boundary between the physical address range of 0E0000h-0FFFFFh. The format is as follows: Offset No. Bytes Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Table 8-1. Mode Real, 16-, &...
Page 168 = Entry point for the service relative to the BASE returned in EBX The following subsections describe aspects of Desktop Management unique to this system. For a general description of these BIOS functions refer to the Compaq BIOS Technical Reference Guide.
Page 169: System Id
ES:BX to indicate the location of the SIT. This section lists the default values that should be read from the SIT. For specific bit descriptions and more detailed information on the SIT refer to the Compaq Basic Input/Output System (BIOS) Technical Reference Guide. Power Conservation Record, SIT Record 01h...
Page 170 Diskette Drive Fnct., Password Functions Password Locking, Ownership Tag Length NOTE: [1] Determined by system at runtime. Third Edition - September 1998 Technical Reference Guide Default Value Default Value Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Default Value...
Page 171 Maximum Memory Installable 0Ch, 0Dh Reserved Processor Designer System Cache Error Correction NOTE: [1] Determined by system at runtime. Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Default Value 0000h 8001h...
Page 172 General Purpose Software Support System EDMA Support NOTE: [1] Determined at run time. Third Edition - September 1998 Technical Reference Guide Default Value B0 B5 BA BFh 0000h 0000h 0000h Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors...
Page 173 Automatic Server Recovery Record, SIT Record 0Bh (Not Used) Memory Banks Information Record, SIT Record 0Ch (Not Used) Multiprocessor Feature Information Record, SIT Record 0Dh (Not Used) 8-10 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Default...
Page 174 Technical Reference Guide Default Value Default Value “Compaq Deskpro EN” Default Value 00000020h 09031996h 00000632h 00000032h 12121996h 00000633h 00000033h 06161997h 00000634h 00000005h 08151997h 00000650h 00000015h 11241997h 00000650h Default Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Value 8-11...
Page 175 Slot ID Type of Slot Data Width of Slot Slot Usage/Length/Virtual Slot Category Slot ID NOTE: [1] Determined at runtime. 8-12 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Default Value...
Page 176: Edid Retrieve
8.4.4 DRIVE FAULT PREDICTION The Compaq BIOS provides direct Drive Fault Prediction support for IDE-type hard drives. This feature is provided through two BIOS calls. Function INT 15, AX=E817h is used to retrieve a 512-byte block of drive attribute data while the INT 15, AX=E81Bh is used to retrieve the drive’s warranty threshold data.
Page 177: System Map Retrieval
(indicates 0-639k is available to the OS) Consecutive calls would continue until EBX returns with 0, indicating that the memory map is complete. 8-14 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998...
Page 178: Flash Rom Functions
Disable (BL=08h) function. Entry: = E822h = 09h = 00 (Failure) = 86, call not supported Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide 8-15...
Page 179: Accessing Cmos
= Pointer to buffer passing multiple byte features OUTPUT: (Successful) = Reserved = Value read (on a read) (Failure) = 86h, Function not supported 8-16 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998...
Page 180 S/W BOM Serial Number of Bytes 0040h Select ECP Mode NOTE: For full bit definitions refer to the Compaq BIOS Technical Reference Guide . Compaq Deskpro EN Series of Personal Computers Third Edition - September 1998 Technical Reference Guide Default...
Page 181: Security Functions
0000 = Bit 0 0001 = Bit 1 0010 = Bit 2 0011 = Bit 3 8-18 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors 0100 = Bit 4 0101 = Bit 5 0110 = Bit 6...
Page 182: Pnp Support
(and require intervention) by the user. Table 8-2 shows the PnP functions supported (for detailed PnP information refer to the Compaq BIOS Technical Reference Guide): Table 8–1. PnP BIOS Functions...
Page 183: Smbios
System Configuration Options BIOS Language Information Physical Memory Array Memory Devices Memory Error Information Memory Array Mapped Addresses Memory Device Mapped Addresses 8-20 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998...
Page 184: Power Management Functions
Sleep/Wake logic (S1, S4 (NT), S5 Legacy/ACPI select C1 state (Halt) C2 state (STOPGRANT) C3 state (no clock) PCI PME Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide 8-21...
Page 185: Apm Support
15 minutes before Standby entered: Keyboard Mouse Serial port d. Diskette drive Hard drive 8-22 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Name APM Control APM Status Third Edition - September 1998...
Page 186 530Dh Enable/Disable Device Power Management 530Eh APM Driver Version 530Fh Engage/Disengage Power Management 5380h OEM (Compaq) Specific APM Function Third Edition - September 1998 Technical Reference Guide Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors 8-23...
Page 187: Usb Legacy Support
1. Create a system (bootable) diskette using the FORMAT A: /S command in DOS. 2. Download the appropriate BIOS firmware from the Compaq web site. 3. Copy the downloaded BIOS file and the flash utility file onto the boot diskette.
Page 188: Appendix Aerror Messages And Codes
Any failure Table A-2. Beep/Keyboard LED Codes LED Blinking [1] Probable Cause NUM Lock Base memory failure. CAP Lock Video/graphics controller failure. Scroll Lock System failure (prior to video initialization). Compaq Personal Computers Changed – April 1998 Technical Reference Guide...
Page 189: Power-On Self Test (Post) Messages
System Board Device Resource Conflict System Memory Size Mismatch NOTE: PCI and PnP messages are displayed with bus, device, and function information. Compaq Personal Computers Table A-3. Power-On Self Test (POST) Messages Probable Cause Serial ID checksum of PnP card was invalid.
Page 190: Processor Error Messages
Speed test Auto mode out of range 112-12 Speed test variable speed mode inoperative 113-01 Protected mode test failed 114-01 Speaker test failed 116-xx Way 0 read/write test failed 199-00 Installed devices test failed Compaq Personal Computers Changed – April 1998 Technical Reference Guide...
Page 191: Memory Error Messages
LED test, 8042 self-test failed 303-02 LED test, reset test failed 303-03 LED test, reset failed 303-04 LED test, LED command test failed Compaq Personal Computers Table A-5. Table A-6. Keyboard Error Messages Message Probable Cause 303-05 LED test, LED command test failed...
Page 192: Printer Error Messages
320x200 mode, color set 1 test failed 510-01 640x200 mode test failed 511-01 Screen memory page test failed 512-01 Gray scale test failed 514-01 White screen test failed 516-01 Noise pattern test failed Compaq Personal Computers Changed – April 1998 Technical Reference Guide...
Page 193: Diskette Drive Error Messages
1101-09 Port test, interrupt circuit failure 1101-10 Port test, COM1 set to invalid INT 1101-11 Port test, COM2 set to invalid INT Compaq Personal Computers Table A-9. Diskette Drive Error Messages Message Probable Cause 6xx-20 Failed to get drive type...
Page 194: Modem Communications Error Messages
Dial number string too long 1210-08 Modem time-out waiting for remote response 1210-09 Modem exceeded maximum redial limit 1210-10 Line quality prevented remote response 1210-11 Modem time-out waiting for remote connection Compaq Personal Computers Changed – April 1998 Technical Reference Guide...
Page 195: Hard Drive Error Messages
1705-xx = Hard drive controller test 1706-xx = Hard drive ready test 1707-xx = Hard drive recalibrate test 1708-xx = Hard drive format bad track test 1709-xx = Hard drive reset controller test Compaq Personal Computers Table A-12. Hard Drive Error Messages Message Probable Cause...
Page 196: Hard Drive Error Messages
AVGA 256-color test failed 2458-xx AVGA BitBLT test failed 2468-xx AVGA DAC test failed 2477-xx AVGA data path test failed 2478-xx AVGA BitBLT test failed 2480-xx AVGA linedraw test failed Compaq Personal Computers Changed – April 1998 Technical Reference Guide...
Page 197: Audio Error Messages (3206- Xx
Ethernet configuration test failed 6016-xx Ethernet reset test failed 6028-xx Ethernet int. loopback test failed 6029-xx Ethernet ext. loopback test failed A-10 Compaq Personal Computers Table A-15. Table A-16. Network Interface Error Messages Message Probable Cause 6054-xx Token ring configuration test failed...
Page 198: Scsi Interface Error Messages
Autoloader reported tape not loaded properly Table A-18. Message Probable Cause 8601-06 Left block not selected 8601-07 Right block not selected 8601-08 Timeout occurred 8601-09 Mouse loopback test failed 8601-10 Pointing device is inoperative Compaq Personal Computers Changed – April 1998 Technical Reference Guide A-11...
Page 199: Cemm Priviledged Ops Error Messages
INT 0 (arithmetic overflow) INT 3 Array bounds check Invalid opcode Coprocessor device not available Double fault Coprocessor segment overrun A-12 Compaq Personal Computers Table A-19. CEMM Privileged Ops Error Messages Message Probable Cause LL3 instruction MOV CRx instruction MOV DRx instruction MOV TRx instruction Table A-20.
Page 200: Appendix B Ascii Character Set
Figure B–1. ASCII Character Set Symbol Blank ¶ § Table B-1. ASCII Character Set Symbol Symbol Space “ & ‘ < > Compaq Personal Computers Original - July 1996 Technical Reference Guide Symbol ‘ Continued...
Page 201 94, 95 Shift and key w/corresponding symbol Key w/corresponding symbol 97-126 Key w/corresponding symbol or Shift and key w/corresponding symbol Ctrl - 128-255 Alt and decimal digit(s) of desired character Compaq Personal Computers Symbol Symbol á í ó ú ñ...
Page 202: Appendix Ckeyboard
C. Appendix C KEYBOARD INTRODUCTION This appendix describes the Compaq keyboard that is included as standard with the system unit. The keyboard complies with the industry-standard classification of an “enhanced keyboard” and includes a separate cursor control key cluster, twelve “function” keys, and enhanced programmability for additional functions.
Page 203: Keystroke Processing
(and the respective key strokes) are lost. Multi-byte sequences must fit entirely into the buffer before the respective keystroke can be registered. Compaq Personal Computers Caps Lock Lock...
Page 204: Transmissions To The System
Tcl Tch Minimum Maximum 60 us 80 us 30 us 35 us 30 us 45 us 45 us 62 us 8 us 14 us Compaq Personal Computers Change –- April 1998 Technical Reference Guide Parity Stop (MSb)
Page 205: Keyboard Layouts
Appendix C Keyboard C.2.2 KEYBOARD LAYOUTS C.2.2.1 Standard Enhanced Keyboards Figure C–3. U.S. English (101-Key) Keyboard Key Positions Figure C–4. National (102-Key) Keyboard Key Positions Compaq Personal Computers Changed - April 1998...
Page 206: Figure C-5. U.s. Englishw
C.2.2.2 Windows Enhanced Keyboards Figure C–5. U.S. English Windows (101W-Key) Keyboard Key Positions Figure C–6. National Windows (102W-Key) Keyboard Key Positions 111 112 111 112 Compaq Personal Computers Change –- April 1998 Technical Reference Guide...
Page 207: Keys
The key that is pressed to resume operation is discarded. This function may be ignored by the application. The Esc, Fn (function), Insert, Home, Page Up/Down, Delete, and End keys operate at the discretion of the application software. Compaq Personal Computers Changed - April 1998...
Page 208 The Ctrl, Alt, and Delete keystroke combination (required twice if in the Windows environment) initiates a system reset (warm boot) that is handled by the BIOS. Compaq Personal Computers Change –- April 1998...
Page 209 (speaker volume, monitor brightness, password, etc.). Key position 112 (marked with an application window icon other keys for invoking Windows application functions. Compaq Personal Computers ) have the same functionality and are used by themselves Function Open Start menu...
Page 210: Keyboard Commands
Issued by the keyboard following an invalid input. 83ABh Upon receipt of the Read ID command from the system, the keyboard issues the ACK command followed by the two IDS bytes. Compaq Personal Computers Change –- April 1998 Technical Reference Guide...
Page 211: Table C-2. Keyboard Scanc
E0 2A E0 49/E0 C9 E0 AA [6] Num Lock E0 AA E0 35/E0 B5 E0 2A [1] ([x] Notes listed at end of table.) C-10 Compaq Personal Computers Table C-2. Keyboard Scan Codes Make / Break Codes (Hex) Mode 1...
Page 212 6B/F0 6B [6] 73/F0 73 [6] 74/F0 74 [6] 12/F0 12 1A/F0 1A 22/F0 22 21/F0 21 2A/F0 2A 32/F0 32 Compaq Personal Computers Change –- April 1998 Mode 3 1D/F0 1D 24/F0 24 2D/F0 2D 2C/F0 2C 35/F0 35 3C/F0 3C...
Page 213 [5] Left Shift key active. For active right Shift key, substitute F0 12/12 make/break codes for F0 59/59 codes. [6] Num Lock key active. [7] Windows keyboards only C-12 Compaq Personal Computers Make / Break Codes (Hex) Mode 1 Mode 2 31/B1...
Page 214: Introduction
D. Appendix D Compaq 10/100 TX PCI Intel WOL UTP Controller Card INTRODUCTION This appendix describes the Compaq 10/100 TX PCI Intel WOL UTP Controller card (# 323550- 001). Key features of this card include: Intel 82558 Fast LAN controller with 32-bit architecture and 3-KB TX/RX buffers.
Page 215: Status Indicators
Appendix D Compaq 10/100 TX PCI Intel WOL UTP Controller Card FUNCTIONAL DESCRIPTION The Compaq 10/100 TX PCI Intel WOL UTP Controller card contains the 82558 controller (with ROMs and support logic), three LED status indicators, a WOL header connector, a RJ-45 network connector, and power switching logic (Figure D-2).
Page 216: Card Power And Clock
82558 provides high-level command support for minimum Host CPU intervention and uses 3-KB FIFOs for both transmit and receive buffers. 82558 Ethernet Controller 3-KB TX FIFO Micro 10BASE-TX/ FIFO Cntrl Machine 100BASE-T 3-KB RX FIFO Compaq Personal Computers Changed - June 1998 Technical Reference Guide TX Data TX/RX RX Data Filters...
Page 217: Power Management Support
Appendix D Compaq 10/100 TX PCI Intel WOL UTP Controller Card D.2.4 POWER MANAGEMENT SUPPORT The controller card provides system wake up using network events and supports both APM and ACPI power management environments. NOTE: The APM and ACPI environments use different methods to implement the Wake-On-LAN function.
Page 218: Configuration/Control
Device ID 1229h Description Transmit Receive Receive Low Transmit Low Table D-1. Operating Specifications Half or full duplex for 10BASE-T, 100BASE-TX APM, ACPI, PCI Power Management Spec. 2.41 watts 2.61 watts Compaq Personal Computers Changed - June 1998 Technical Reference Guide...
Page 219 Appendix D Compaq 10/100 TX PCI Intel WOL UTP Controller Card This page is intentionally blank. Compaq Personal Computers Changed - June 1998...
Page 220: Appendix E Wide Ultra Scsi Host Adapter
E. Appendix E Wide Ultra SCSI Host Adapter INTRODUCTION The Adaptec AHA-2940UW SCSI Host Adapter (Compaq p/n 334136-001) is a PCI peripheral that provides high performance interfacing with compatible SCSI peripherals, specifically hard drives. The card installs in a PCI slot and supports full bus mastering capability.
Page 221: Figure E-2. Adaptec Aha-2940U U
BIOS Mem. I/F AIC7880 SCSI Controller Serial EEPROM Figure E–2. Adaptec AHA-2940U Ultra SCSI Adapter Card Block Diagram Compaq Personal Computers SCSI Activity 40-MHz Clock Ultra SCSI Connector (Ext) Wide Ultra SCSI Connector (Int. & Ext.) PCI Bus Original – April 1998...
Page 222: Scsi Adapter Programming
Table E–2. Ultra SCSI Host Adapter Card Specifications Ultra SCSI Host Adapter Card Specifications Operating Voltage Maximum Current Draw Operating Temperature Table E-1. Table E-2. +5 VDC 32 F (0 C) to 131 F (55 C) Compaq Personal Computers Original - April 1998 Technical Reference Guide...
Page 223: User Guidelines
Multiple LUN Support BIOS Support for Bootable CD-ROM BIOS Support for INT 13 Extensions Support for Ultra SCSI Speed Silent/Verbose Mode Setting POST Speedup Feature Write Cache Compaq Personal Computers Table E-3. Setting Hard Drive available CD-ROM (if installed) available...
Page 224: Scsi Connectors
Data Bus Pulse Ground Ground Ground TERMPWR Termination Power Ground Ground ATN- Attention Ground BSY- Busy ACK- Acknowledge SBRST- Burst MSG- Message Activity SEL- Select C-/D Control/Data Transfer Indicator REQ- Request I-/O Input/Output Indicator Compaq Personal Computers Original - April 1998...
Page 225: Figure E-4. Wide Ultra Scsi C
Termination Power Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Compaq Personal Computers Table E-4. Wide-Ultra SCSI Connector Pinout Signal DB12 DB13 DB14 DB15 DBP- DB0- DB1- DB2- DB3- DB4- DB5- DB6- DB7-...
Page 226: Appendix F Ati Rage Pro Agp 1X/2X Graphics Cards
Figure F–1. ATI RAGE PRO AGP Graphics Card Layout (NLX version shown) Technical Reference Guide page F-2 page F-4 page F-5 page F-6 page F-6 ATI Multimedia Channel Connector (P1) Rage Pro Turbo Compaq Personal Computers Original - April 1998 SODIMM Expansion Connector...
Page 227: Figure F-2. Ati Rage Pro Agp G
MS Direct3D support for Win95 QuickDraw 3D RAVE support for Win95 and WinNT OpenGL support for Win95 and WinNT Heidi support for WinNT ATI 3D CIF support for Win95 Compaq Personal Computers On-Board SGRAM [1] 64-Bit Graphics Memory Bus RAGE PRO Turbo...
Page 228: Ati Rage Pro Turbo Agp Graphics Controller
VESA Connector Figure F–3. ATI 3DRage Pro Graphics Controller Internal Architecture 3D RAGE PRO Memory Controller Controller Video Drawing Processor Coprocessor Compaq Personal Computers Original - April 1998 Technical Reference Guide Graphics Data Memory HSync VSync Display Green Monitor Blue...
Page 229: Display Modes
Table F–2. 3D Graphics Display Modes Resolution Color Depth 512 x 384 640 x 480 640 x 480 640 x 480 16.7M 800 x 600 Compaq Personal Computers Table F-1. Horizontal Color Depth Refresh Freq. 200 Hz 200 Hz 16.7M 200 Hz...
Page 230: Programming
Standard VGA Mode I/O Mapping Address Function 3C6h..3C9h RAMDAC 3CAh Read VSYNC Status 3CCh Misc. Control, Read 3CF.00..08h Graphics Controller 3D5.00..26h* CRT Controller (color) 3DAh VSYNC Control, Display Status (color) Compaq Personal Computers Original - April 1998 Technical Reference Guide...
Page 231: Monitor Power Management Control
2-MB SGRAM module installed as standard. The SODIMM socket on the AGP 2X card is not populated and can accept a 4-MB SGRAM module for expansion to eight megabytes. Compaq Personal Computers Table F-5. Monitor Power Management Conditions Description Monitor is completely powered up.
Page 232: Monitor Connector
Green Analog Ground NOTES: [1] Fuse automatically resets when excessive load is removed. Table F-6. DB-15 Monitor Connector Pinout Signal HSync VSync Compaq Personal Computers Original - April 1998 Technical Reference Guide Description +5 VDC (fused) [1] Ground Not Connected DDC2-B Data...
Page 233: Ati Multimedia Channel Connector
RESET- Reset SAD6 SA Data Bit 6 RESVD Reserved A. GND Ground AUD R Right Audio NOTE: VESA standard interface is unshaded. Compaq Personal Computers Multimedia Interface VESA Standard Feature I/F Table F-7. Signal DCLK BLANK HSYNC VSYNC SAD3 SAD7...
Page 234 INDEX 3D effects, F-2 87307 I/O controller, 4-49 abbreviations, 1-3 Accelerated Graphics Port (AGP), 4-11 ACPI, D-4 acronyms, 1-3 administrator password, 4-52, 4-53 AGP, 4-11 AGP bus, 2-10 analog-to-digital converter (ADC), 6-4 APM, D-4 APM BIOS functions, 8-23 APM BIOS support, 8-22 architecture, system, 2-10 ASCII character set, B-1 AT attachment (ATA), 5-3...
Page 235 graphics subsystem, 2-14 graphics, 3D, F-2 guidelines, SCSI user, E-4 hard drive spindown, 4-57 heat sink (processor), 2-12, 3-5 Host bus, 2-10 I/O controller (87307), 4-49 I/O map, 4-46 IDE interface, 5-1 index addressing, 1-2 interrupts maskable (IRQn), 4-23 nonmaskable (NMI, SMI), 4-25 interrupts, PCI, interval timer, 4-27 ISA bus, 2-10...
Page 236 system ID, 8-6 system information table (SIT), 8-6 system management, 4-51 system memory, 2-13, 3-6 system ROM, 2-13, 8-1 tempurature sensor, 4-54 thermal considerations, 3-5 thermister, 4-56 timer, interval, 4-27 UART, 5-14 Universal Serial Bus (USB) interface, 5-34 upggrading BIOS, 8-24 upgrading, Ethernet interface, D-4 upgrading, processor, 3-5 USB interface, 5-34...
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This manual is also suitable for:

Deskpro en

Compaq EN Series Technical Reference Manual

Chapter 1 Introduction

Chapter 2 System Overview

Chapter 3 Processor/Memory Subsystem

Chapter 4 System Support

Chapter 5 Input/Output Interfaces

Chapter 6 Audio Subsystem

Chapter 7 Power Supply and Distribution

Chapter 8 Bios Rom

Appendix Aerror MESSAGES and CODES

Appendix B Ascii Character Set

Appendix Ckeyboard

Appendix D Compaq 10/100 Tx Pci Intel Wol Utp Controller Card

Appendix E Wide Ultra Scsi Host Adapter

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Summary of Contents for Compaq EN Series