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Techn
ical Referen
ce Guid
e
Compaq Deskpro 4000N and 4000S P
ersonal Computers
F
ir
st E
dit
ion – Septem
ber 1997
ii
1
2
3
4
5
6
7
8
9
...
195
196
Technical
1
Reference
1
Technical Reference Guide
4
TABLE OF CONTENTS
5
LIST OF FIGURES
10
LIST OF TABLES
11
Chapter 1
13
INTRODUCTION
13
Continued
15
Chapter 2
19
SYSTEM OVERVIEW
19
2.2 FEATURES
20
2.2.1 STANDARD FEATURES
20
2.2.2 MODEL DIFFERENCES
21
2.2.3 OPTIONS
21
2.3 MECHANICAL DESIGN
22
2.3.1 CABINET LAYOUT
22
2.3.2 CHASSIS LAYOUT
24
2.3.3 SYSTEM BOARD LAYOUT
25
2.4 SYSTEM ARCHITECTURE
26
2.4.1 MICROPROCESSOR
28
2.4.2 MEMORY
28
2.4.3 SUPPORT CHIPSET
29
2.4.4 MASS STORAGE
29
2.4.7 GRAPHICS SUBSYSTEM
30
2.5 SPECIFICATIONS
31
Chapter 2 System Overview
34
Chapter 3
35
PROCESSOR/
35
MEMORY SUBSYSTEM
35
3.2.1.1 MMX Technology
37
3.2.4 SYSTEM MEMORY
39
Chapter 4
43
SYSTEM SUPPORT
43
4.2 PCI BUS OVERVIEW
44
4.2.1 PCI CONNECTOR
45
4.2.3 PCI BUS TRANSACTIONS
47
4.2.3.2 Configuration Cycles
47
4.2.5 PCI INTERRUPT MAPPING
51
4.2.6 PCI CONFIGURATION
52
4.3 ISA BUS OVERVIEW
53
4.3.1 ISA CONNECTOR
54
4.3.2 ISA BUS TRANSACTIONS
55
4.3.3 DIRECT MEMORY ACCESS
57
4.3.3.1 Page Registers
58
4.3.4 INTERRUPTS
60
4.3.4.1 Maskable Interrupts
60
NMI- Generation
62
SMI- Generation
63
4.3.5 INTERVAL TIMER
64
4.3.6 ISA CONFIGURATION
64
Chapter 4 System Support
82
4.6.1 SYSTEM I/O MAP
83
4.7.2 PASSWORD PROTECTION
87
4.7.3 I/O SECURITY
88
4.7.4 USER SECURITY
88
4.7.5 TEMPERATURE SENSING
89
4.7.6 POWER MANAGEMENT
90
Chapter 5
91
INPUT/OUTPUT INTERFACES
91
5.2.2 IDE CONNECTORS
98
5.3 DISKETTE DRIVE INTERFACE
100
5.4 SERIAL INTERFACES
105
5.4.1 RS-232 INTERFACE
105
5.5 PARALLEL INTERFACE
111
5.6.3.1 8042 Configuration
120
5.6.3.2 8042 Control
121
Continued
122
(Continued)
123
1 DATA Data 4 + 5 VDC Power
124
5.7 ETHERNET INTERFACE
125
5.7.2 NIC CONNECTORS
126
5.8.1 USB CONFIGURATION
127
5.8.2 USB CONTROL
128
5.8.3 USB CONNECTOR
128
Chapter 6
129
GRAPHICS SUBSYSTEM
129
6.2 SUBSYSTEM DESCRIPTION
130
6.2.3.2 Subsystem Control
132
MONITOR POWER CONTROL
133
6.2.5 CONNECTORS
134
Chapter 7
135
POWER and SIGNAL
135
DISTRIBUTION
135
7.2.1 POWER SUPPLY ASSEMBLY
136
7.2.2 POWER CONTROL
137
7.3 POWER DISTRIBUTION
138
7.4 SIGNAL DISTRIBUTION
140
Chapter 8
141
BIOS ROM
141
8.2 BOOT FUNCTIONS
142
8.2.1 BOOT BLOCK
142
8.2.2 QUICKBOOT
142
8.2.3 SILENTBOOT
142
ACCESSING CMOS
143
SETTING DEFAULT PARAMETERS
143
8.4.1 SYSTEM ID
147
Chapter 8 BIOS ROM
148
Technical Reference Guide
149
8.4.3 TEMPERATURE SENSOR
152
8.4.4 DRIVE FAULT PREDICTION
152
8.4.5 DIMM SUPPORT
153
8.4.6 SECURITY FUNCTIONS
155
8.5 PNP SUPPORT
157
8.6 POWER MANAGEMENT SUPPORT
158
Appendix A
161
ERROR MESSAGES AND CODES
161
Appendix B
173
ASCII CHARACTER SET
173
Appendix C
175
KEYBOARD
175
C.2 KEYSTROKE PROCESSING
176
C.2.2 KEYBOARD LAYOUTS
178
C.2.3 KEYS
181
Changed - November 1996
182
C.2.3.3 Windows Keystrokes
183
C.2.4 KEYBOARD COMMANDS
184
C.2.5 SCAN CODES
184
C.3 SCANNER DESCRIPTION
188
C.3.1 SCANNER OPERATION
189
Appendix C Keyboard
190
Compaq Personal Computers
190
C.3.1.2 Image Quality
191
C.3.2 SCANNER INTERFACE
192
C.3.2.1 Pnyb Mode
193
First Edition – July 1997
195
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