Compaq 4000N manuals
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When we buy new device such as Compaq 4000N we often through away most of the documentation but the warranty.
Very often issues with Compaq 4000N begin only after the warranty period ends and you may want to find how to repair it or just do some service work.
Even oftener it is hard to remember what does each function in Personal Computer Compaq 4000N is responsible for and what options to choose for expected result.
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196 pages 1004.71 Kb
3 NOTICE5 TABLE OF CONTENTS Technical Reference Guide Compaq Deskpro 4000N and 4000S Personal Computers viii 10 LIST OF FIGURES11 LIST OF TABLES13 Chapter 1 INTRODUCTION35 Chapter 3 PROCESSOR/ MEMORY SUBSYSTEM43 Chapter 4 SYSTEM SUPPORT4. Chapter 4 SYSTEM SUPPORT 4.1 INTRODUCTION 44 4.2 PCI BUS OVERVIEW45 4.2.1 PCI CONNECTOR46 4.2.2 PCI BUS MASTER ARBITRATION47 4.2.3 PCI BUS TRANSACTIONS4.2.3.1 I/O and Memory Cycles 4.2.3.2 Configuration Cycles 50 4.2.3.3 Special Cycles4.2.4 OPTION ROM MAPPING 51 4.2.5 PCI INTERRUPT MAPPING52 4.2.6 PCI CONFIGURATION53 4.3 ISA BUS OVERVIEW54 4.3.1 ISA CONNECTOR55 4.3.2 ISA BUS TRANSACTIONS57 4.3.3 DIRECT MEMORY ACCESS58 4.3.3.1 Page Registers59 4.3.3.2 DMA Controller Registers60 4.3.4 INTERRUPTS4.3.4.1 Maskable Interrupts 62 4.3.4.2 Non-Maskable InterruptsNMI- Generation 63 SMI- Generation64 4.3.5 INTERVAL TIMER4.3.6 ISA CONFIGURATION 65 4.4 SYSTEM CLOCK DISTRIBUTION66 4.5 REAL-TIME CLOCK AND CONFIGURATION MEMORY67 4.5.1 CONFIGURATION MEMORY BYTE DEFINITIONS68 4-26RTC Control Register A, Byte 0Ah RTC Control Register B, Byte 0B h RTC Status Register C, Byte 0Ch RTC Status Register D, Byte 0Dh 72 4-30Configuration Byte 26h, Auxiliary Peripheral Configuration Configuration Byte 29h, Miscellaneous Configuration Data Configuration Byte 27h, Speed Control/External Drive Configuration Byte 28h, Expanded and Base Memory, IRQ12 Select 73 Compaq Deskpro 4000N and 4000S Personal Computers4-31 Configuration Byte 2Ah, Hard Drive Timeout Configuration Byte 2Bh, System Inactivity Timeout Configuration Byte 2Ch, ScreenSave and NUMLOCK Control 80 4-38Configuration Byte 94h, ROM Flash/Power Button Status Configuration Byte 97h, Asset/Test Prompt Byte Configuration Byte 9Bh, Ultra-33 DMA Enable Byte Configuration Byte 9Ch, Mode-2 Configuration Byte Compaq Deskpro 4000N and 4000S Personal Computers 4-41 83 4.6 I/O MAP AND REGISTER ACCESSINGThis section describes the system I/O map an d m et h ods of accessing various system functions. 4.6.1 SYSTEM I/O MAPTable 417. System I/O Map Table 4-17. System I/O Map 84 4.6.2 87307 I/O CONTROLLER CONFIGURATION86 4.7 SYSTEM MANAGEMENT SUPPORT4.7.1 FLASH ROM WRITE PROTECT 87 4.7.2 PASSWORD PROTECTION88 4.7.3 I/O SECURITY4.7.4 USER SECURITY 89 4.7.5 TEMPERATURE SENSING90 4.7.6 POWER MANAGEMENT4.7.6.1 HARD DRIVE SPINDOWN CONTROL 4.7.6.2 DISPLAY MONITOR POWER MANAGEMENT CONTROL 91 Chapter 5 INPUT/OUTPUT INTERFACES129 Chapter 6 GRAPHICS SUBSYSTEM135 Chapter 7 POWER and SIGNAL DISTRIBUTION141 Chapter 8 BIOS ROM161 Appendix A ERROR MESSAGES AND CODES173 Appendix B ASCII CHARACTER SETB. Appendix B ASCII CHARACTER SET B.1 INTRODUCTION 175 Appendix C KEYBOARD195 INDEX
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