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Chapter 5 Input/Output Interfaces
5.4.2.2 Serial Interface Control
The BIOS function INT 14 provides basic control of the serial interface. The serial interface can
be directly controlled by software through the I/O-mapped registers listed in Table 5-9.
Table 5–9. Serial Interface Control Registers
Table 5-9.
Serial Interface Control Registers
COM1
Addr.
COM2
Addr.
Register
R/W
3F8h 2F8h Receive Data Buffer
Transmit Data Buffer
Baud Rate Divisor Register 0 (when bit 7 of Line Control Reg. Is set)
R
W
W
3F9h 2F9h Baud Rate Divisor Register 1 (when bit 7 of Line Control Reg. Is set)
Interrupt Enable Register
W
R/W
3FAh 2FAh Interrupt ID Register
FIFO Control Register
R
W
3FBh 2FBh Line Control Register R/W
3FCh 2FCh Modem Control Register R/W
3FDh 2FDh Line Status Register R
3FEh 2FEh Modem Status R
5-10 Compaq Evo and Workstation Personal Computers
Featuring the Intel Pentium 4 Processor
Second Edition – January 2003
- Technical Reference Guide 1
- 3
- TABLE OF CONTENTS 7
- LIST OF FIGURES 13
- LIST OF TABLES 15
- Chapter 1 19
- INTRODUCTION 19
- 1.4 SERIAL NUMBER 20
- 1.5 NOTATIONAL CONVENTIONS 21
- 1.5.1 VALUES 21
- 1.5.2 RANGES 21
- Chapter 2 27
- SYSTEM OVERVIEW 27
- 2.2 FEATURES AND OPTIONS 28
- 2.2.1 STANDARD FEATURES 28
- 2.2.2 OPTIONS 29
- 2.3 MECHANICAL DESIGN 30
- 2.3.1 CABINET LAYOUTS 31
- 2.3.1.1 Front Views 31
- 2.3.1.2 Rear Views 32
- 2.3.2 CHASSIS LAYOUTS 33
- 2.3.3 BOARD LAYOUTS 36
- 2.4 SYSTEM ARCHITECTURE 38
- 2.4.2 CHIPSET 41
- 2.4.3 SUPPORT COMPONENTS 41
- 2.4.9 GRAPHICS SUBSYSTEM 43
- 2.4.10 AUDIO SUBSYSTEM 44
- 2.5 SPECIFICATIONS 44
- Chapter 3 47
- PROCESSOR/ 47
- MEMORY SUBSYSTEM 47
- 3.2 PENTIUM 4 PROCESSOR 48
- 3.2.1 PROCESSOR OVERVIEW 48
- 3.2.2 PROCESSOR UPGRADING 50
- 3.3 MEMORY SUBSYSTEM 51
- Chapter 4 55
- SYSTEM SUPPORT 55
- 4.2 PCI BUS OVERVIEW 56
- 4.2.2 PCI BUS MASTER ARBIT 61
- Second Edition – January 2003 62
- 4.2.7 PCI CONFIGURATION 63
- 4.2.8 PCI CONNECTOR 64
- 4.3 AGP BUS OVERVIEW 65
- BUS TRANSACTIONS 65
- Data Request 66
- 4.3.1.2 Data Transfers 66
- AGP 2X Transfers 67
- A 4X Tra 67
- GP nsfers 67
- 4.3.2 AGP CONFIGURATION 68
- .3.3 AGP CONNECTOR 69
- 8259 Mode 71
- APIC Mode 71
- MI- Generation 72
- Non-Maskable Interrupts 72
- SMI- Generation 73
- 4.4.2 IRECT MEMORY ACCESS 74
- DMA Page Registers 75
- 4.4.2.2 trolle gi 76
- DMA Con r Re sters 76
- CLE NG CMOS 78
- STANDARD CMOS LOCATIONS 79
- .7.1.5 Chassis Security 81
- 4.7.2 POWER MANAGEMENT 82
- SYSTEM STATUS 82
- RM EN AND COOLING 83
- 4.7.4 HE 83
- T AL S SING 83
- SYSTEM I/O MAP 85
- Chapter 5 88
- INPUT/OUTPUT INTERFACES 88
- 5.2.2 IDE CONNECTOR 90
- 5.4 SERIAL INTERFACE 95
- 5.4.1 SERIAL CONNECTOR 95
- 5.5 PARALLEL INTERFACE 98
- 5.6.3.1 8042 Configuration 105
- 5.6.3.2 8042 Control 106
- 5.7.1 USB DATA FORMATS 109
- 5.7.2 USB PROGRAMMING 111
- 5.7.2.1 USB Configuration 111
- 5.7.2.2 USB Control 111
- 5.7.3 USB CONNECTOR 112
- 5.7.4 USB CABLE DATA 112
- 5.8 AUDIO SUBSYSTEM 113
- 5.8.1 FUNCTIONAL ANALYSIS 113
- 5.8.2 AC97 AUDIO CONTROLLER 115
- 5.8.3 AC97 LINK BUS 115
- 5.8.4 AUDIO CODEC 116
- 5.8.5 AUDIO PROGRAMMING 117
- 5.8.5.1 Audio Configuration 117
- 5.8.5.2 Audio Control 117
- 5.8.6 AUDIO SPECIFICATIONS 118
- 5.9.1 WAKE ON LAN SUPPORT 120
- 5.9.2 ALERT ON LAN SUPPORT 120
- 5.9.3.1 APM Environment 121
- 5.9.3.2 ACPI Environment 121
- 5.9.4 NIC PROGRAMMING 122
- 5.9.4.1 Configuration 122
- 5.9.4.2 Control 122
- 5.9.5 NIC CONNECTOR 123
- 5.9.6 NIC SPECIFICATIONS 123
- 5.9.7 NIC UPGRADING/CHANGING 124
- Chapter 6 126
- POWER and SIGNAL 126
- DISTRIBUTION 126
- 6.2.1 POWER SUPPLY ASSEMBLY 127
- 6.2.2 POWER CONTROL 128
- 6.2.2.1 Power Button 128
- 6.2.2.3 Wake Up Events 129
- 6.2.3 POWER MANAGEMENT 130
- 6.3 POWER DISTRIBUTION 131
- 6.4 SIGNAL DISTRIBUTION 134
- Second Edition- January 2003 137
- Chapter 7 138
- BIOS ROM 138
- 7.2 ROM FLASHING 139
- 7.2.1 UPGRADING 139
- Second Edition - January 2003 140
- 7.3 BOOT FUNCTIONS 141
- 7.3.1 BOOT DEVICE ORDER 141
- 7.3.4 BOOT ERROR CODES 142
- 7.4 SETUP UTILITY 143
- 7.5.2 EDID RETRIEVE 151
- 7.5.3 TEMPERATURE STATUS 152
- 7.5.4 DRIVE FAULT PREDICTION 152
- 7.6 PNP SUPPORT 152
- 7.6.1 SMBIOS 153
- 7.7.2 ACPI SUPPORT 156
- 7.7.3 APM 1.2 SUPPORT 156
- System Timer 158
- IDE Hard Drive Timer 158
- System/Hard Drive Standby 159
- System Suspend 159
- System OFF 160
- 7.7.3.3 Waking Up in APM 160
- 7.8 USB LEGACY SUPPORT 160
- Appendix A 162
- ERROR MESSAGES AND CODES 162
- Changed - November 2000 173
- Appendix B 174
- ASCII CHARACTER SET 174
- Appendix C 176
- KEYBOARD 176
- C.2 KEYSTROKE PROCESSING 177
- Changed - July 2000 179
- C.2.3 KEYBOARD LAYOUTS 180
- C.2.4 KEYS 183
- C.2.4.3 Windows Keystrokes 184
- C.2.5 KEYBOARD COMMANDS 186
- C.2.6 SCAN CODES 186
- Continued 189
- C.3 CONNECTORS 191
- Appendix D 192
- COMPAQ/NVIDIA VANTA LT 192
- AGP GRAPHICS CARD 192
- D.2 FUNCTIONAL DESCRIPTION 193
- D.3 DISPLAY MODES 194
- D.6 CONNECTORS 196
- D.6.1 MONITOR CONNECTOR 196
- Changed - October 2000 197
- Appendix E 198
- COMPAQ/NVIDIA QUADRO2 EX/MXR 198
- AGP GRAPHICS CARDS 198
- E.2 FUNCTIONAL DESCRIPTION 199
- E.3 DISPLAY MODES 200
- E.6 CONNECTORS 202
- E.6.1 MONITOR CONNECTOR 202
- Changed - October2001 203
- Appendix F 204
- F.2 FUNCTIONAL DESCRIPTION 205
- F.3 DISPLAY MODES 206
- F.6 CONNECTORS 208
- F.6.1 MONITOR CONNECTOR 208
- Appendix G 210
- G.2 FUNCTIONAL DESCRIPTION 211
- G.3.2 SCSI ADAPTER CONTROL 212
- G.4 SPECIFICATIONS 212
- G.5 SCSI CONNECTORS 213
- Appendix H 216
- PCI GRAPHICS CARD 216
- H.2 FUNCTIONAL DESCRIPTION 217
- H.3 DISPLAY MODES 219
- Original - March 2002 220
- H.7 CONNECTORS 222
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